IPAC2011 - List of Keywords (controls)

Paper	Title	Other Keywords	Page
MOYAA01	The LHC from Commissioning to Operation	injection, luminosity, optics, ion	11
	M. Lamont CERN, Geneva, Switzerland
	In 2011 the LHC moves from commissioning into the physics production phase with the aim of accumulating 1fb-1 by the end of 2011. The progress from commissioning to operation is described. Emphasis is put on the beam performance, but also on the performance of the different hardware systems. The role of collimation and machine protection is discussed, in view of the very high stored beam and magnet energy. Comment: Other invited presentations in this conference will cover the experience with beam instrumentation and the upgrade programmes.
	Slides MOYAA01 [7.410 MB]

MOPC001	Linac Waveguide Upgrade at the Australian Synchrotron Light Source	klystron, linac, booster, synchrotron	62
	R.T. Dowd, G. LeBlanc, K. Zingre ASCo, Clayton, Victoria, Australia
	The Australian Synchrotron Light Source (ASLS) uses a 100 MeV linac as the start of the acceleration chain for the injector. The two main accelerating structures of linac are normally fed by independent pulsed klystrons. A recent upgrade to the waveguide system has allowed for a single klystron to power both accelerating structures. While this operation mode delivers a reduced total beam energy, the operation of only a single klystron results in less wear and enhanced robustness against klystron breakdown. Commissioning results of single klystron operation of the linac are shown and future benefits are detailed.

MOPC016	Development of a New RF Accelerating Cavity for J-PARC Ring Accelerator	cavity, simulation, impedance, ion	98
	Y. Morita, T. Kageyama KEK, Ibaraki, Japan J. Kameda ICRR, Chiba, Japan S. Yamashita ICEPP, Tokyo, Japan
	Funding: Japan Society for the Promotion of Science (JSPS) To enhance the beam power delivered by the J-PARC* ring accelerators, upgrading the accelerating cavities is indispensable. In particular, long term stable operation of the present cavities for the RCS is one of the important issues. Currently, the cavities are loaded with FINEMET* cores cooled by water, where every core is coated with glass cloth and epoxy resin for waterproof. However, it was reported that some of the cores were damaged by thermal stress. We are developing a new cavity loaded with multi ring core modules. Each core module consists of three ring cores concentrically arranged and sandwiched between two glass epoxy plates with flow channels grooved. The ring cores without waterproof coating are cooled by the turbulent flow of a chemically inert liquid (Fluorinert), since FINEMET is subject to corrosion in water. We have designed and built a high power prototype cavity loaded with a single core module, then carried out low level measurement and high power test. Finally, the cavity has been stably operated up to an average power loss of 10 kW per core module, which is 1.7 times higher than that for the present RCS cavity. Japan Proton Accelerator Research Complex Rapid-Cycling Synchrotron **FINEMET is an iron-based magnetic alloy produced by Hitachi Metals, Ltd..

MOPC030	The C-band Traveling-wave Accelerating Structure for Compact XFEL at SINAP*	linac, vacuum, impedance, status	133
	W. Fang, Q. Gu, Z.T. Zhao SINAP, Shanghai, People's Republic of China D.C. Tong TUB, Beijing, People's Republic of China
	The R&D of C-band accelerating structure has been launched two years ago at Shanghai Institute of Applied Physics, it will be used for the future compact hard X-ray FEL. The 1st C-band traveling-wave accelerating structure is ready for the high power test now. This structure is the preliminary model for the research of the technology of microwave test and tuning, arts and crafts and high power test. This paper presents the process of fabrication, cold test and tuning results.

MOPC032	Improvement of the RF System for the PEFP 100 MeV Proton Linac*	linac, LLRF, proton, EPICS	139
	K.T. Seol, Y.-S. Cho, H.S. Kim, H.-J. Kwon, Y.-G. Song KAERI, Daejon, Republic of Korea
	Funding: This work is supported by the Ministry of Education, Science and Technology of the Korean Government. The 100 MeV proton linear accelerator of the Proton Engineering Frontier Project (PEFP) has been developed and will be installed in Gyeong-ju site. The 20 MeV accelerator operated in Korea Atomic Energy Research Institute (KAERI) site will be also moved and reinstalled. The LLRF control systems for the 20 MeV accelerator were improved and have been operated within the stability of ±1% in RF amplitude and ±1 degree in RF phase. 7 sets of the extra LLRF control system will be installed with a RF reference system for the 100 MeV accelerator. Waveguide layout was also improved to install HPRF systems for the 100 MeV accelerator. Some of the HPRF components including klystrons, circulators, and RF windows are under purchase. The waveguide sections penetrating into the tunnel, which are fixed in a concrete floor with the bending structure for radiation shielding, were fabricated into a piece of waveguide to prevent the moisture and any foreign debris inside the concrete block. The details of the RF system improvement are presented.

MOPC037	Engineering Design and Fabrication of X-band Damped Detuned Structure for the CLIC Study	damping, vacuum, alignment, wakefield	154
	V. Soldatov, D. Gudkov, A. Samoshkin JINR, Dubna, Moscow Region, Russia S. Atieh, A. D'Elia, A. Grudiev, G. Riddone CERN, Geneva, Switzerland R.M. Jones, V.F. Khan UMAN, Manchester, United Kingdom
	A Damped Detuned Structure (DDS), known as CLIC_DDS_A, has been designed for the Compact Linear Collider (CLIC) study, and is presently under fabrication. The wakefield in DDS structures is damped using a combination of detuning the frequencies of beam-excited higher order modes and by light damping, through slot-coupled manifolds. The broad principles of the design are similar to that used in the NLC/GLC. This serves as an alternative to the present baseline CLIC design which relies on heavy damping. CLIC_DDS_A is conceived to be tested for its capacity to sustain high gradients at CERN. This structure operates with a 120 degrees phase advance per cell. We report on engineering design and fabrication details of the structure consisting of 24 regular cells plus 2 matching cells at both ends, all diffusion bonded together. This design takes into account practical mechanical engineering issues and is the result of several optimizations since the earlier CLIC_DDS designs. V. F. Khan et al., “Recent Progress on a Manifold Damped and Detuned Structure for CLIC”, Proc. of IPAC10, WEPE032, p. 3425 (2010). ** R.M. Jones et al., Phys. Rev. STAB 9, 102001 (2006).

MOPC042	RF and Accelerating Structure of 12 MeV UPC Race-track Microtron	linac, vacuum, coupling, microtron	169
	Yu.A. Kubyshin, X. Gonzalez Arriola UPC, Barcelona, Spain D. Carrillo, L. García-Tabarés, F. Toral CIEMAT, Madrid, Spain S.J. Mathot CERN, Geneva, Switzerland G. Montoro EPSC, Castelldefels, Spain V.I. Shvedunov MSU, Moscow, Russia
	We describe the design and technical characteristics of a C-band SW accelerating structure of a 12 MeV race-track microtron, which is under construction at the Technical University of Catalonia, and its RF system with a 5712 MHz magnetron as a source. Results of cold tests of the accelerating structure, before and after the brazing, and of high-power tests of the RF system at a special stand are reported. The main features of the magnetron frequency stabilization subsystem are also outlined.

MOPC049	Bead-pull Test Bench for Studying Accelerating Structures at RHUL	cavity, rfq, quadrupole, resonance	187
	S. Molloy ESS, Lund, Sweden R. Ainsworth, G.E. Boorman Royal Holloway, University of London, Surrey, United Kingdom C. Gabor STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom A. Garbayo AVS, Eibar, Gipuzkoa, Spain A.P. Letchford STFC/RAL, Chilton, Didcot, Oxon, United Kingdom A. Lyapin JAI, Egham, Surrey, United Kingdom P. Savage Imperial College of Science and Technology, Department of Physics, London, United Kingdom
	A bead-pull test stand has been constructed at Royal Holloway, University of London (RHUL) with the ability to provide electric field profile measurements along five degrees of freedom using the perturbation method. In this paper, we present example measurements using the test bench which include a field flatness profile of a 324MHz four vane Radio Frequency Quadrupole (RFQ) model designed as part of the Front End Test Stand (FETS) development at Rutherford Appleton Laboratory (RAL). Mechanical and operational details of the apparatus will also be described, as well as future plans for the development and usage of this facility.

MOPC062	EMMA RF Comissioning	cavity, LLRF, acceleration, beam-loading	226
	A.J. Moss, R.K. Buckley, P.A. McIntosh, A.E. Wheelhouse STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
	EMMA (Electron Model for Many Applications), the world’s first Non-Scaling Fixed Field Alternating Gradient (NS-FFAG) accelerator is presently in operation at Daresbury Laboratory. The LLRF system is required to synchronize with ALICE (Accelerators and Lasers in Combined Experiments) its injector, which operates at 1.3GHz, and to produce an offset frequency of (+1.5 MHz to -4 MHz) to probe the longitudinal beam dynamics and to also maintain the phase and amplitude of the 19 copper RF cavities of the EMMA machine. The design, commissioning and results of the EMMA RF system is presented.

MOPC083	Structural Mechanics of Superconducting CH Cavities	cavity, simulation, linac, resonance	268
	M. Amberg, K. Aulenbacher HIM, Mainz, Germany W.A. Barth, S. Mickat GSI, Darmstadt, Germany M. Busch, F.D. Dziuba, H. Podlech, U. Ratzinger IAP, Frankfurt am Main, Germany
	The superconducting CH-structure (Crossbar-H-mode) is a multi-cell drift tube cavity for the low and medium energy range operated in the H21-mode, which has been developed at the Institute for Applied Physics (IAP) of Frankfurt University. With respect to different high power applications two types of superconducting CH-structures (f = 325 MHz, β = 0.16, seven cells and f = 217 MHz, β = 0.059, 15 cells) are presently under construction and accordingly under development. The structural mechanical simulation is a very important aspect of the cavity design. Furthermore, several simulations with ANSYS Workbench have been performed to predict the deformation of the cavity walls due to the cavity cool-down, pressure effects and mechanical vibrations. To readjust the fast frequency changes in consequence of the cavity shape deformation, a new concept for the dynamic frequency tuning has been investigated, including a novel type of bellow-tuner.

MOPC088	Bead-pull Measurement using Phase-Shift Technique in Multi-cell Elliptical Cavity	cavity, linac, vacuum, monitoring	280
	S. Ghosh, A. Mandal, S. Seth, S.S. Som DAE/VECC, Calcutta, India
	The project on the development of high-beta multi-cell elliptical shape superconducting rf linac cavity at around 704 MHz has been funded at VECC, Kolkata, India. A full-scale copper prototype cavity has been designed and fabricated. There are 5 distinct modes exist in the cavity and the accelerating mode is pi-mode in which each cell operates at same frequency with phase difference of 180 degrees between two neighboring cells. A fully automated bead-pull measurement setup has been developed for analyzing these modes and field profile distribution at different modes in such type of linac cavity. A special measurement method inside the cavity using phase-shift technique is proposed in this paper, which describes the development of mechanical setup comprising pulleys and stepper motor–gear arrangement, PC-based control system for precise movement of bead using stepper motor, measurement using VNA, development of software for data acquisition & automation and measurement results for the 5-cell copper prototype cavity.

MOPC090	Tuner Performance in the S1-global Cryomodule	cavity, cryomodule, high-voltage, coupling	286
	R. Paparella, A. Bosotti, C. Pagani INFN/LASA, Segrate (MI), Italy C. Albrecht, K. Jensch, L. Lilje DESY, Hamburg, Germany S. Barbanotti, Y.M. Pischalnikov, W. Schappert Fermilab, Batavia, USA H. Hayano, E. Kako, S. Noguchi, N. Ohuchi, Y. Yamamoto KEK, Ibaraki, Japan
	S1-Global is a collaborative effort of INFN, DESY, FNAL, SLAC and KEK, in the framework of the ILC global collaboration. For this project two cryomodules, 6 meter long and hosting four SC cavities each, were realized and successfully cold tested at KEK-STF. Three different cavity tuning systems, provided with fast tuning capability through piezoelectric actuators (piezo), were installed, and fully characterized in static and dynamic operation: Blade Tuner from INFN/FNAL, Saclay Tuner from DESY, Slide Jack Tuner from KEK. Finally, Lorenz Force Detuning (LFD) active compensation has been successfully achieved during high power cavity tests in pulsed RF regime, where active control of the LFD disturbance up to Hz-level residual detuning has been achieved with each type of tuning system up to the maximum gradient of each cavity. The installation procedures, together with the relevant results and their analyses are summarized in the paper.

MOPC093	Novel Field Emission Scanner for Surface Study of Niobium SRF Cavity	cavity, SRF, electron, site	295
	S. Kato, M. Nishiwaki, T. Noguchi KEK, Ibaraki, Japan V. Chouhan GUAS, Kanagawa, Japan P.V. Tyagi Sokendai, Ibaraki, Japan
	It is mandatory to investigate field emission on Nb SRF cavity systematically since strong field emission often limits the cavity performance. The field emission strength and the number of emission sites strongly depend on Nb surface properties which are determined by its surface treatment and handling. Field emission scanner (FES) developed allows us to measure a distribution of the field emitting sites over a sample surface at a given field strength along with its FE-SEM observation and energy dispersive x-ray analysis. FES consists of an anode needle driven by precise 3D stepping motors and an eucentric sample stage. The compact scanner was installed into the space between the object lens and the SEM sample holder. In addition, this system was newly equipped with a sample load-lock system for existing UHV suitcases. Therefore a sample coupon to be observed is hardly exposed to contaminants and dust particles during the transportation. In-situ heating of a sample coupon can be done during an experiment to simulate a baking process of a SRF cavity. This article describes development of the field emission scanner and its preliminary results of the application to niobium samples.

MOPC097	LLRF Control System for PKU DC-SC Photocathode Injector	cavity, LLRF, superconducting-cavity, SRF	304
	H. Zhang, Y.M. Li, K.X. Liu, F. Wang, B.C. Zhang PKU/IHIP, Beijing, People's Republic of China
	A 1.3 GHz 3.5 Cell LG niobium cavity is installed for the new PKU DC-SC injector as its accelerating cavity with working temperature is 2K. High amplitude and phase stability is required for the updated SRF photocathode injector. This paper describes the design of Low Level RF control system based on FPGA, including hardware and software,and the communication function is realized by Tri-State Ethernet. The system should be operated on the precision with the amplitude of ±0.1% and phase stability of ±0.1°.

MOPC108	Cornell SRF New Materials Program*	cavity, niobium, SRF, monitoring	328
	S. Posen, M. Liepe, Y. Xie CLASSE, Ithaca, New York, USA
	Funding: Work supported by NSF Career award PHY-0841213, DOE award ER41628, and the Alfred P. Sloan Foundation The SRF group at Cornell has recently pioneered an extensive program to investigate alternative materials for superconducting cavities. We have developed facilities to fabricate Nb3Sn, a superconductor which will theoretically be able to reach more than twice the maximum accelerating field of Nb in a cavity under the same operating conditions. In addition, with the critical temperature of Nb3Sn being twice that of Nb, Nb3Sn would allow operation of SRF cavities with a much higher cryogenic efficiency. We have also manufactured two TE cavities that measure the RF properties of small, flat samples, ideal for material fabrication methods in development. This paper presents an overview of the materials research program. First results from tests of Nb3Sn samples are presented.

MOPC118	Effects of the Thickness of Niobium Surface Oxide Layers on Field Emission*	cavity, SRF, niobium, HOM	355
	A.T. Wu, S. Jin, J.D. Mammosser, R.A. Rimmer JLAB, Newport News, Virginia, USA X.Y. Lu, K. Zhao PKU/IHIP, Beijing, People's Republic of China
	Funding: The U.S. Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce this manuscript for U.S. Government purposes. Field emission on the inner surfaces of niobium superconducting radio frequency cavities is still one of the major obstacles for reaching high accelerating gradients for SRF community. Our previous experimental results* seemed to imply that the threshold of field emission was related to the thickness of Nb surface oxide layers. In this contribution, a more detailed study on the influences of the surface oxide layers on the field emission on Nb surfaces will be reported. By anodization technique, the thickness of the surface pentoxide layer was artificially fabricated from 3 nm up to 460 nm. A home-made scanning field emission microscope was employed to perform the scans on the surfaces. Emitters were characterized using a scanning electron microscope together with an energy dispersive x-ray analyzer. The SFEM experimental results were analyzed in terms of surface morphology and oxide thickness of Nb samples and chemical composition and geographic shape of the emitters. A model based on the classic electromagnetic theory was developed trying to understand the experimental results. Possibly implications for Nb SRF cavity applications from this study will be discussed. * A.T. Wu et al., Proc. of IPAC 2010, Kyoto, Japan, WEPEC081, p. 3067 (2010). Authored by The Southeastern Universities Research Association, Inc. under U.S. DOE Contract No. DE-AC05-84ER40150.

MOPC135	IFMIF-EVEDA RF Power System	power-supply, linac, LLRF, cavity	394
	D. Regidor, A. Arriaga, J.C. Calvo, A. Ibarra, I. Kirpitchev, J. Molla, P. Méndez, A. Salom, M. Weber CIEMAT, Madrid, Spain M. Abs, B. Nactergal IBA, Louvain-la-Neuve, Belgium P.-Y. Beauvais, M. Desmons, A. Mosnier CEA/DSM/IRFU, France P. Cara Fusion for Energy, Garching, Germany S.J. Ceballos, J. de la Cruz Greenpower Technologies, Sevilla, Spain Z. Cvetkovic, Z. Golubicic, C. Mendez TTI, Santander, Spain J.M. Forteza, J.M. González, C.R. Isnardi Indra Sistemas, San Fernando de Henares, Spain D. Vandeplassche SCK-CEN, Mol, Belgium
	The IFMIF/EVEDA Accelerator Prototype will be a 9 MeV, 125 mA CW deuteron accelerator to validate the technical options for the IFMIF accelerator design. The Radiofrequency Quadrupole (RFQ), buncher cavities and Superconducting Radiofrequency Linac (SRF Linac) require continuous wave RF power at 175 MHz with an accuracy of ±1% in amplitude and ±1° in phase. Also the IFMIF/EVEDA RF Power System has to work under pulsed mode operation (during the accelerator commissioning). The IFMIF/EVEDA RF Power System is composed of 18 RF power generators feeding the eight RFQ couplers (200 kW), the two buncher cavities (10⁵ kW) and the eight superconducting half wave resonators of the SRF Linac (10⁵ kW). The main components of each RF power chain are the Low Level Radio Frequency system (LLRF), three amplification stages and a circulator with its load. For obvious standardization and scale economies reasons, the same topology has been chosen for the 18 RF power chains: all of them use the same main components which can be individually tuned to provide different RF output powers up to 200 kW. The studies and the current design of the IFMIF/EVEDA RF Power System are presented in this contribution.

MOPC137	Medium Power 352 MHz Solid State Pulsed RF Amplifiers for the CERN Linac4 Project	linac, cavity, rf-amplifier, shielding	400
	J.C. Broere, J. Marques Balula CERN, Geneva, Switzerland Y. Gomez LPSC, Grenoble Cedex, France M. Rossi DBE, Padova, Italy
	Economic, modular and highly linear pulsed RF amplifiers have recently been developed to be used for the three Buncher cavities in the CERN Linac4. The amplifiers are water cooled and can provide up to 33 kW pulsed RF power, 1.5 msec pulse length and 50 Hz repetition rate. Furthermore a 60 kWatt unit is under construction to provide the required RF Power for the Debuncher cavity. The concept is based on 1.2 kW RF power modules using the latest 6th generation LDMOS technology. For integration into the CERN control environment the amplifiers have an internal industrial controller, which will provide easy control and extended diagnostic functions. This paper describes the construction, performance, including linearity, phase stability and EMC compliance tests.

MOPC138	Practical Test of the Linac4 RF Power System	klystron, linac, cavity, electron	403
	N. Schwerg, O. Brunner CERN, Geneva, Switzerland
	Linac4 is a linear accelerator for negative Hydrogen ions which will replace the old Linac2 as injector for the CERN accelerators. Its higher energy of 160 MeV will increase the beam intensity in the downstream machines. The normal-conducting accelerating structures are housed in a 100 m long tunnel which will be connected to the existing chain of accelerators and can be extended into a new injector chain. The high RF power for the Linac4 accelerating structures will be generated by thirteen 1.3 MW klystrons, previously used for the CERN LEP accelerator, and six new klystrons of 2.8 MW all operating at a frequency of 352.2 MHz. The re-use of existing LEP equipment, space limitations in the installation and tight phase and amplitude constraints pose a number of challenges for the integration of the RF power system. The power distribution scheme features a folded magic-tee feeding the power from a 2.8 MW klystron to two LEP circulators. We present first results from the Linac4 test place, validating the approach and the used components as well as reporting on the klystron re-tuning activities.

MOPC140	Phase and Frequency Locked Magnetrons for SRF Sources	cavity, resonance, shielding, SRF	406
	M.L. Neubauer, M.A.C. Cummings, A. Dudas, R.P. Johnson, R. Sah Muons, Inc, Batavia, USA A. Moretti, M. Popovic Fermilab, Batavia, USA
	Typically, high power sources for accelerator applications are multi-megawatt microwave tubes that may be combined together to form ultra-high-power localized power stations. The RF power is then distributed to multiple strings of cavities through high power waveguide systems which are problematic in terms of expense, efficiency, and reliability. Magnetrons are the lowest cost microwave source in dollars/kW, and they have the highest efficiency (typically greater than 85%). However, the frequency stability and phase stability of magnetrons are not adequate, when magnetrons are used as power sources for accelerators. Novel variable frequency cavity techniques have been developed which will be utilized to phase and frequency lock magnetrons, allowing their use for either individual cavities, or cavity strings. Ferrite or YIG (Yttrium Iron Garnet) materials will be attached in the regions of high magnetic field of radial-vaned, π−mode structures of a selected ordinary magnetron. The microwave characteristics of several materials have been tested with magnetic fields to control the frequency of the magnetron. These results will be presented and an optimum material chosen.

MOPC145	Recent Progress on the Technical Realization of the Bunch Phase Timing System BuTiS	laser, cavity, diagnostics, status	418
	B. Zipfel, P. Moritz GSI, Darmstadt, Germany
	A high precision phase synchronous clock distribution system is mandatory for generating local RF reference signals in an accelerator complex. The dedicated Bunch Timing System (BuTiS) at GSI performs this function. The accuracy of the realized installation under rough ambient conditions is presented. Procedures for calibration and standardization aspects of system modules are pointed out. Hardware as well as software interfaces of the system are described. The interfacing between GPS and BuTiS are explained.

MOPC146	Development of Timing Distribution System with Femto-second Stability	feedback, linac, acceleration, laser	421
	T. Naito, K. Ebihara, S. Nozawa, N. Terunuma, J. Urakawa KEK, Ibaraki, Japan M. Amemiya AIST, Tsukuba, Japan
	A timing distribution system with femto-second stability has been developed for the RF synchronization of accelerator and the laser synchronization of the pump-probe experiments. The system uses a phase stabilized optical fiber(PSOF) and an active fiber length stabilization. The PSOF has 5 ps/km/degC of the temperature coefficient. The active fiber length stabilization uses the phase detection of the round-trip sinusoidal wave and the fiber stretcher for the compensation of the fiber length. In this paper, we present the test results on a 500 m long signal distribution. The preliminary results of the timing stability are 20 fs at several minutes and 100 fs at four days, respectively.

MOPC147	Timing System for MedAustron Based on Off-The-Shelf MRF Transport Layer	ion, synchrotron, ion-source, light-ion	424
	R. Tavcar, J. Dedič, Z. Kroflic, R. Štefanič Cosylab, Ljubljana, Slovenia J. Gutleber CERN, Geneva, Switzerland
	MedAustron is a new particle accelerator-based ion beam research and therapy centre under construction in Wiener Neustadt, Austria. The timing system for its synchrotron-based accelerator is being developed in close collaboration with Cosylab. We have usedμResearch Finland (MRF) transfer layer and designed and implemented a generic, reusable high-level logic above transport layer inside the generator and receiver FPGA to fulfill machine specific requirements which exceed MRF's original high-level logic capabilities. The new timing system is suitable for small to mid-size accelerators. Its functionalities include support for virtual accelerators and a rich selection of event response mechanisms. The timing system uses a combination of a real-time link for downstream events and a non-real-time link for upstream messaging and non time-critical communication. This article explains the benefits of building a timing system on a proven, stable timing transport layer and describes the high-level services provided by MedAustron timing system.

MOPC151	Design and Commissioning of a Multi-frequency Digital Low Level RF Control System*	cavity, low-level-rf, linac, superconducting-cavity	433
	M. Konrad, U. Bonnes, C. Burandt, J. Conrad, R. Eichhorn, J. Enders, P.N. Nonn, N. Pietralla TU Darmstadt, Darmstadt, Germany
	Funding: Work supported by DFG through CRC 634 and by the BMBF under 06 DA 9024 I. Triggered by the need to control the superconducting cavities of the S-DALINAC, which have a high loaded quality factor and are thus very susceptible to microphonics, the development of a digital low level RF control system was started. The chosen design proved to be very flexible since other frequencies than the original 3 GHz may be adapted easily: The system converts the RF signal coming from the cavity (e. g. 3 GHz) down to the base band using a hardware I/Q demodulator. The base band signals are digitized by ADCs and fed into a FPGA where the control algorithm is implemented. The resulting signals are I/Q modulated before they are sent back to the cavity. The superconducting cavities are operated with a self-excited loop algorithm whereas a generator-driven algorithm is used for the low Q normal-conducting bunching cavities. A 6 GHz RF front end allows the synchronous operation of a new 2f buncher at the S-DALINAC. Meanwhile, a 325 MHz version has been built to control a pulsed prototype test stand for the p-LINAC at FAIR. We will present the architecture of the RF control system as well as results obtained during operation.

MOPC152	Digital Control System for Solid State Direct Drive™ RF-Linacs	cavity, LLRF, linac, pick-up	436
	J. Sirtl, M. Back, T. Kluge Siemens AG, Erlangen, Germany H. Schröder ASTRUM IT GmbH, Erlangen, Germany
	The Solid State Direct Drive™ concept for RF linacs has previously been introduced. Due to the different methodology (i.e. solid state based rather than electron tube based) as compared with conventional RF sources a new control system is required to deliver the required LLRF. To support this new technology a fully digital control system for this new concept has been developed. Progresses in Digital – Analogue Converter technology and FPGA technology allows us to create a digital System which works in the 150 Mhz baseband. The complete functionality was implemented in a Virtex 6 FPGA. Dispensing with the PLL allows an excellent jitter-behaviour. For this job, we use three 12 bit ADCs with a Sampling Rate of 1 GS/s and two 16 bit DACs (1 GS/s). The amplitude of the RF source is controlled by dividing the RF modules mounted on the power combiner* into two groups and controlling the relative phase of each group (in effect mimicking an “out-phasing” amplifier). This allows the modules to be operated at their optimum working point and allows a linear amplitude behaviour. * O. Heid, T. Hughes, Proc. of IPAC10, THPD002, p. 4278, Kyoto, Japan (2010). ** O. Heid, T. Hughes, Proc. of LINAC10, THPD068, Tsukuba, Japan.

MOPC153	Design and Implementation of Automatic Cavity Resonance Frequency Measurement and Tuning Procedure for FLASH and European XFEL Cryogenic Modules	cavity, klystron, LLRF, resonance	439
	V. Ayvazyan, W. Koprek, D. Kostin, G. Kreps DESY, Hamburg, Germany Z. Geng SLAC, Menlo Park, California, USA
	The superconducting cavities in FLASH and European XFEL should be tuned to the frequency of 1.3 GHz after cool down and adjusted to initial frequency before warm up by stepper motor tuners. The initial frequency is 300 kHz far from the operating frequency (1.3 GHz) to remove mechanical hysteresis of the tuner. The cavities should be relaxed to initial frequency to avoid a plastically deformation. In framework of digital low level RF and DOOCS control systems we have developed a simple automatic procedure for the remote resonance frequency measurement and simultaneous remote tuning for all cavities which are driven from the single klystron. The basic idea is based on frequency sweeping both for driving klystron and for generation of local oscillator frequency with constant RF frequency from master oscillator. The developed system has been used during FLASH commissioning in spring 2010 and is in use for cavity and cryogenic module test stands for European XFEL at DESY.

MOPC155	Performance of the Micro-TCA Digital Feedback Board for DRFS Test at KEK-STF	cavity, feedback, klystron, LLRF	445
	T. Miura, D.A. Arakawa, S. Fukuda, E. Kako, H. Katagiri, T. Matsumoto, S. Michizono, Y. Yano KEK, Ibaraki, Japan
	The test of distributed RF scheme (DRFS) for ILC was carried out at the superconducting RF test facility in KEK (KEK-STF). The LLRF system and two klystron units were installed in the same tunnel as SRF cavities. The vector-sum control for two cavities was done by using the micro-TCA digital feedback board. This board was the same one developed for the compact-ERL at KEK, but the software was changed for pulse operation. The result of the performance will be reported.

MOPC157	Performance of LLRF System at S1-Global in KEK*	cavity, diagnostics, klystron, cryogenics	451
	S. Michizono, D.A. Arakawa, S. Fukuda, E. Kako, H. Katagiri, T. Matsumoto, T. Miura, Y. Yano KEK, Ibaraki, Japan
	Vector-sum control was carried out at S1-Global. The rf stabilities of 0.007% in amplitude and 17 mdeg. in phase are obtained. Various diagnostics (such as on-line quench pulse detector, dynamic detuning monitor and so on) is implemented. The IF-mixture system, where 3 intermediate frequencies (IF) are used and the number of ADCs can be reduced, was used as rf waveform monitors. These monitors are used for the performance analysis. Quench phenomena observed at the high-gradient operation are also analyzed from the view point of dynamic change in loaded Q and cavity detuning during rf pulse.

MOPC160	Digital LLRF for IFMIF-EVEDA	cavity, LLRF, rfq, resonance	457
	A. Salom, A. Arriaga, J.C. Calvo, I. Kirpitchev, P. Méndez, D. Regidor, M. Weber CIEMAT, Madrid, Spain A. Mosnier CEA/IRFU, Gif-sur-Yvette, France F. Pérez CELLS-ALBA Synchrotron, Cerdanyola del Vallès, Spain
	The IFMIF-EVEDA project aims to build a prototype accelerator (deuteron, 9MeV, 125mA) to be located at Rokkasho, Japan, for design validation of the IFMIF Accelerator. CIEMAT from Madrid, Spain, is in charge of providing the RF systems for this prototype accelerator. The LLRF will adjust the phase and amplitude of the RF drive and the resonance frequency of the cavities. This paper summarizes its main characteristics and Control System integrated in EPICS. The hardware is based on a commercial FPGA board, an analog front end and a local timing system. Each LLRF system will control and diagnose two RF chains and it will handle the RF fast Interlocks (vacuum, arcs, reflected power and multipacting). A specific LLRF will be developed for the special case of the RFQ cavity, with one Master LLRF and three Slave LLRFs to feed the 8 RF chains of the cavity. The conceptual design and other capabilities of the system like automatic conditioning, frequency tuning for startup and field flatness of the RFQ, etc, will be shown in this paper together with the first low power test results of the LLRF prototype and the performance of the Control System.

MOPC161	Challenges for the Low Level RF Design for ESS	cavity, LLRF, klystron, linac	460
	A.J. Johansson Lund University, Lund, Sweden R. Zeng ESS, Lund, Sweden
	The European Spallation Source (ESS) is a planned neutron source to be built in Lund, Sweden, which is planned to produce the first neutrons in 2019. It will have an average beam power at the target of 5 MW, an average current along the Linac of 50 mA, and a pulse repetition rate and length of 20 Hz and 2 ms, respectively. The Linac will have around 200 LLRF stations employed to control a variety of RF cavities such as RFQ, DTL, spoke and elliptical superconducting cavities. The challenges on LLRF systems are mainly the high demands on energy efficiency on all parts of the facility, an operational goal of 95% availability of the facility and a comparably short time from start of final design to commissioning. Running with long pulses, high current and spoke cavities also brings new challenges on LLRF design. In this paper we will describe the consequences these challenges have on the LLRF system, and the proposed solutions and development projects that have started in order to reach these demands.

MOPC163	Low-level RF Control System for the Taiwan Photon Source	cavity, LLRF, low-level-rf, SRF	463
	M.-S. Yeh NSRRC, Hsinchu, Taiwan
	The low-level RF (LLRF) control system is an essential component of the RF system for Taiwan Photon Source. The LLRF control system will perform various functions including control loops for the cavity gap voltage and the phase feedback, RF system interlock protection and the diagnostics for a machine trip. The LLRF system is manufactured in house using the most recent commercial RF chips. The LLRF system has an analogue architecture similar to that used in the 1.5-GeV Taiwan Light Source (TLS). An overview of the system architecture and its functionality is presented herein.

MOPC164	Upgrade of the ISIS Synchrotron Low Power RF System	cavity, feedback, ion, synchrotron	466
	A. Seville, N.E. Farthing, I.S.K. Gardner, R.J. Mathieson, J.W.G. Thomason STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom D.B. Allen STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
	The ISIS synchrotron at the Rutherford Appleton Laboratory in the UK now routinely uses a dual harmonic RF system to accelerate beam currents in excess of 230 uA to run two target stations simultaneously. In order to give more stable control of the phase of the RF voltage at each of the fundamental (1RF) and second harmonic (2RF) cavities, changes have been made to the low power RF (LPRF) control systems. In addition to this a new FPGA based master oscillator has been commissioned for the first time, and further changes using digital technologies to replace other components of the LPRF system are to be investigated. This paper reports on the LPRF hardware commissioning and reliability.

MOPC165	Digital Low Level RF Development at Daresbury Laboratory	cavity, LLRF, linac, beam-loading	469
	P.A. Corlett, L. Ma, A.J. Moss STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
	Digital LLRF development using Field Programmable Gate Arrays (FPGAs) is a new activity at Daresbury Laboratory. Using the LLRF4 development board, designed by Larry Doolittle of Lawrence Berkeley National Laboratory, a full featured control system incorporating fast feedback loops and a feed-forward system has been developed for use on the ALICE (Accelerators and Lasers in Combined Experiments) energy recovery linac. Technical details of the system are presented, along with experimental measurements.

MOPC166	Low RF Control Feedback and IQ Vector Modulator Compensation Functions	linac, gun, feedback, coupling	472
	M.G. Fedurin, R. Malone, V. Yakimenko BNL, Upton, Long Island, New York, USA
	IQ vector modulator is key element of the gun and linac RF control circuits at Accelerator Test Facility at Brookhaven National Laboratory. IQ modulator calibration procedure was developed to find proper compensation functions in the conversion algorithm to minimize phase-amplitude coupling and setting-reading errors: rms(A_set - A_read )= 0.03dB, rms(Phi_set - Phi_read) = 0.3 deg. Since stabilization of the RF phase and amplitude is become critical for many experiments the slow feedback was developed and applied as well to significantly compensate drifts in RF system.

MOPO001	Interaction Point Feedback Design and Integrated Simulations to Stabilize the CLIC Final Focus*	simulation, feedback, quadrupole, ground-motion	475
	G. Balik, L. Brunetti, G. Deleglise, A. Jeremie, L. Pacquet IN2P3-LAPP, Annecy-le-Vieux, France A. Badel, B. Caron, R. Le Breton SYMME, Annecy-le-Vieux, France A. Latina, J. Pfingstner, D. Schulte, J. Snuverink CERN, Geneva, Switzerland
	The Compact Linear Collider (CLIC) accelerator has strong precision requirements on offset position between the beams. The beam which is sensitive to ground motion needs to be stabilized to unprecedented requirements. Different Beam Based Feedback (BBF) algorithms such as Orbit Feedback (OFB) and Beam-Beam Offset Feedback (BBOF) have been designed. This paper focuses on the BBOF control which could be added to the CLIC baseline. It has been tested for different ground motion models in the presence of noises or disturbances and uses digital linear control with or without an adaptive loop. The simulations demonstrate that it is possible to achieve the required performances and quantify the maximum allowed noise level. This amount of admitted noises and disturbances is given in terms of an equivalent disturbance on the position of the magnet that controls the beam offset. Due to the limited sampling frequency of the process, the control loop is in a very small bandwidth. The study shows that these disturbances have to be lowered by other means in the higher frequency range.

MOPO002	Fast Orbit Correction for the ESRF Storage Ring	power-supply, storage-ring, feedback, diagnostics	478
	E. Plouviez, F. Epaud, J.M. Koch, K.B. Scheidt ESRF, Grenoble, France
	Today, at the ESRF, the correction of the orbit position is performed with two independent systems: one to deal with the slow movements and one to correct the motion in a range of up to 200Hz but with a limited number of fast BPMs and steerers. This later will be removed and one unique system will cover the frequency range from DC to 200Hz using all the 224 BPMs and the 96 steerers. Indeed, thanks to the procurement of the Liberas Brilliance and installation of new AC power supplies, it is now possible to access all the Beam positions at a frequency of 10 kHz and to drive a small current in the steerers in a 400Hz bandwidth. The first tests of correction of the beam position have been performed and will be presented. This new orbit correction system is also a powerful diagnostics system: the measurement and survey of the Ring's lattice parameters is possible thanks to the high measurement rate of very high resolution position data. Results of this will also be presented.

MOPO006	DAΦNE Bunch-by-bunch Feedback Upgrade as SuperB Design Test	feedback, diagnostics, factory, luminosity	490
	A. Drago INFN/LNF, Frascati (Roma), Italy D. Teytelman Dimtel, San Jose, USA
	DAΦNE, the PHI-factory located in Frascati, has always shown dynamic behavior strongly dependent on the bunch-by-bunch feedback, since its first runs in 1997. Over the years, to keep up with the evolving machine requirements, transverse and longitudinal systems have received multiple upgrades and updates. During fall 2010, all the six DAΦNE feedback systems have been upgraded to support the next run for KLOE as well as to test bunch-by-bunch feedback architectures intended for the future Italian SuperB factory. Both e+/e^- longitudinal feedback systems have been completely replaced with new hardware for increased reliability, better diagnostics and improved maintainability. In the effort to reduce residual dipole beam motion, determined by the front-end and quantization noise floor, vertical feedback systems now feature a 12-bit ADC, in place of the older 8-bit design. In the paper, we describe the hardware and software changes of this upgrade. Feedback performance analysis and beam dynamics data collected by the systems are presented.

MOPO011	The First 1 1/2 Years of TOTEM Roman Pot Operation at LHC	alignment, HOM, scattering, beam-losses	502
	M. Deile, G.H. Antchev, R.W. Assmann, I. Atanassov, V. Avati, J. Baechler, R. Bruce, M. Dupont, K. Eggert, B. Farnham, J. Kaspar, F. Lucas Rodríguez, J. Morant, H. Niewiadomski, X. Pons, E. Radermacher, S. Ravat, F. Ravotti, S. Redaelli, G. Ruggiero, H. Sabba, M. Sapinski, W. Snoeys, G. Valentino, D. Wollmann CERN, Geneva, Switzerland R. Appleby UMAN, Manchester, United Kingdom
	Since the LHC running season 2010, the TOTEM Roman Pots (RPs) are fully operational and serve for collecting elastic and diffractive proton-proton scattering data. Like for other moveable devices approaching the high intensity LHC beams, a reliable and precise control of the RP position is critical to machine protection. After a review of the RP movement control and position interlock system, the crucial task of alignment will be discussed.

MOPO014	SVD-based Filter Design for the Trajectory Feedback of CLIC	ground-motion, feedback, luminosity, simulation	511
	J. Pfingstner, D. Schulte, J. Snuverink CERN, Geneva, Switzerland M. Hofbaur UMIT, Hall in Tirol, Austria
	The orbit feedback of the Compact Linear Collider (CLIC) is the basic counter-measure against ground motion effects below 1 Hz in the beam delivery system and the main linac of CLIC. In this paper we present significant improvements of the orbit feedback design, by using time-dependent and spatial filters. The design procedure is based on a singular value decomposition (SVD) of the orbit response matrix and on loop-shaping techniques. This modified design has essential advantages compared to previous ones. The required beam position monitor resolution in the beam delivery system could be relaxed by a factor of five. At the same time the suppression of ground motion effects is improved. As a consequence, the tight tolerances for the allowable luminosity loss due to ground motion effects in CLIC can be met. The presented methods can be easily adapted to other accelerators in order to relax sensor tolerances and to efficiently suppress ground motion effects.

MOPO015	Operation Status of Bunch-by-bunch Feedback System in the TLS	feedback, injection, diagnostics, kicker	514
	C.H. Kuo, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, K.H. Hu, C.-Y. Liao NSRRC, Hsinchu, Taiwan
	There are several FPGA based bunch-by-bunch feedback systems that were deployed in the Taiwan Light Source now. They play various roles to suppress beam instability. By using SPring-8 designed feedback processors is pioneer to apply in the storage ring of TLS successfully and help Dimtel system to be quick commission. The Dimtel feedback system provide a life spare unit and explore to control system integration especially to the EPICS toolkit system. Rich functionality includes of excitation of individual bunch or specifies bunches, averaged spectrum, tune measurement by the feedback dip in the averaged spectrum. Operation status of the system will be summary in this report.

MOPO016	Commissioning Tune Feedback in the Taiwan Light Source	feedback, insertion, insertion-device, undulator	517
	C.H. Kuo, J. Chen, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, K.H. Hu, C.-Y. Liao, C.Y. Wu NSRRC, Hsinchu, Taiwan
	The tune control is important parameter in the insertion devices operation. There are many difference type insertion devices are disturbed in the storage ring of TLS. The traditional feed-forward control to correct orbit change and tune shift that isn’t enough when difference type insertion devices are operated with various condition. The tune feedback is used to solve the tune change problem. The stable tune measurement is necessary in the stable storage ring. There are various excited bunch train methods to get stable tune that will be also discussed in this report.

MOPO022	Precision Beam Instrumentation and Feedback-Based Beam Control at RHIC	feedback, coupling, acceleration, resonance	526
	M.G. Minty, W. Fischer, H. Huang, R.L. Hulsart, C. Liu, Y. Luo, G.J. Marr, A. Marusic, K. Mernick, R.J. Michnoff, V. Ptitsyn, G. Robert-Demolaize, T. Roser, V. Schoefer, S. Tepikian, M. Wilinski BNL, Upton, Long Island, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. In this report we present advances in beam instrumentation required for feedback-based beam control at the Relativistic Heavy Ion Collider (RHIC). Improved resolution has contributed to enabling now routine acceleration with multiple feedback loops. Better measurement and control of the beam’s properties have allowed acceleration at a new working point and have facilitated challenging experimental studies.

MOPO026	Design, Manufacturing and Tests of Closed-loop Quadrupole Mover Prototypes for European XFEL	quadrupole, alignment, feedback, vacuum	535
	J. Munilla, J. Calero, J.M. Cela-Ruiz, L. García-Tabarés, A. Guirao, J.L. Gutiérrez, T. Martínez de Alvaro, E. Molina Marinas, S. Sanz, F. Toral, C. Vazquez CIEMAT, Madrid, Spain
	Funding: Work partially supported by Spanish Ministry of Science and Innovation under SEI Resolution on 17-September-2009 In this report the development of a quadrupole mover with submicron repeatability is reported, which will be used in the intersections of the Undulator Systems of the European XFEL (EXFEL). It is part of the Spanish in-kind contribution to this facility. The main specifications include submicron repeatability for a 70 kg quadrupole magnet within compact dimensions and a ±1.5 mm stroke in the vertical and horizontal direction. Compact linear actuators based on 5-phase stepping motors have been chosen. Vertical actuator works in a wedge configuration to take mechanical advantage. A closed-loop control system has been developed to achieve this repeatability. For the feedback, one LVDT sensor for each axis was used. Mechanical switches are used to limit movement. In addition, hard-stops are included for emergency. Prototyping stage is done and a serial production of more than 90 devices is expected, so intense work has been done to achieve a reliable industrial production and validation. In this report, results of mechanical measurements including reproducibility, tests of different operation strategies and critical situations will be reported.

MOPO027	Status of a Study of Stabilization and Fine Positioning of CLIC Quadrupoles to the Nanometre Level*	quadrupole, feedback, alignment, damping	538
	K. Artoos, C.G.R.L. Collette, M. Esposito, P. Fernandez Carmona, M. Guinchard, C. Hauviller, S.M. Janssens, A.M. Kuzmin, R. Leuxe, R. Moron Ballester CERN, Geneva, Switzerland
	Funding: The research leading to these results has received funding from the European Commission under the FP7 Research Infrastructures project EuCARD, grant agreement no.227579 Mechanical stability to the nanometre and below is required for the CLIC quadrupoles to frequencies as low as 1 Hz. An active stabilization and positioning system based on very stiff piezo electric actuators and inertial reference masses is under study for the Main Beam Quadrupoles (MBQ). The stiff support was selected for robustness against direct forces and for the option of incrementally repositioning the magnet with nanometre resolution. The technical feasibility was demonstrated by a representative test mass being stabilized and repositioned to the required level in the vertical and lateral direction. Technical issues were identified and the development programme of the support, sensors, and controller was continued to increase the performance, integrate the system in the overall controller, adapt to the accelerator environment, and reduce costs. The improvements are implemented in models, test benches, and design of the first stabilized prototype CLIC magnet. The characterization of vibration sources was extended to forces acting directly on the magnet, such as water-cooling induced vibrations. This paper shows the achievements, improvements, and an outlook on further R&D.

MOPO028	Modal Analysis and Measurement of Water Cooling Induced Vibrations on a CLIC Main Beam Quadrupole Prototype*	quadrupole, ground-motion, resonance, damping	541
	K. Artoos, C.G.R.L. Collette, M. Esposito, P. Fernandez Carmona, M. Guinchard, S.M. Janssens, R. Leuxe, M. Modena, R. Moron Ballester, M. Struik CERN, Geneva, Switzerland G. Deleglise, A. Jeremie IN2P3-LAPP, Annecy-le-Vieux, France
	Funding: The research leading to these results has received funding from the European Commission under the FP7 Research Infrastructures project EuCARD, grant agreement no. 227579. To reach the Compact Linear Collider (CLIC) design luminosity, the mechanical jitter of the CLIC main beam quadrupoles should be smaller than 1.5 nm integrated root mean square (r.m.s.) displacement above 1 Hz. A stiff stabilization and nano-positioning system is being developed but the design and effectiveness of such a system will greatly depend on the stiffness of the quadrupole magnet which should be as high as possible. Modal vibration measurements were therefore performed on a first assembled prototype magnet to evaluate the different mechanical modes and their frequencies. The results were then compared with a Finite Element (FE) model. The vibrations induced by water-cooling without stabilization were measured with different flow rates. This paper describes and analyzes the measurement results.

MOPO029	Validation of a Micrometric Remotely Controlled Pre-alignment System for the CLIC Linear Collider using a Test Setup (Mock-up) with 5 Degrees of Freedom	quadrupole, alignment, target, feedback	544
	H. Mainaud Durand, M. Anastasopoulos, J. Kemppinen, R. Leuxe, M. Sosin, S. griffet CERN, Geneva, Switzerland
	The CLIC main beam quadrupoles need to be pre-aligned within 17μm rms with respect to a straight reference line along a sliding window of 200 m. A re-adjustment system based on eccentric cam movers, which will provide stiffness to the support assembly, is being studied. The cam movers were qualified on a 1 degree of freedom (DOF) test setup, where a repeatability of adjustment below 1 μm was measured along their whole range. This paper presents the 5 DOF mock-up, built for the validation of the eccentric cam movers, as well as the first results of tests carried out: resolution of displacement along the whole range, measurements of the support eigenfrequencies.

MOPO030	Theoretical and Practical Feasibility Demonstration of a Micrometric Remotely Controlled Pre-alignment System for the CLIC Linear Collider	alignment, linac, simulation, target	547
	H. Mainaud Durand, M. Anastasopoulos, N.C. Chritin, J. Kemppinen, M. Sosin, S. griffet CERN, Geneva, Switzerland T. Touzé ENSTA, Brest, France
	The active pre-alignment of the Compact Linear Collider (CLIC) is one of the key points of the project: the components must be pre-aligned w.r.t. to a straight line within a few microns over a sliding window of 200 m, along the two linacs of 20 km each. The proposed solution consists of stretched wires of more than 200 m, overlapping over half of their length, which will be the reference of alignment. Wire Positioning Sensors (WPS), coupled to the supports to be pre-aligned, will perform precise and accurate measurements within a few microns, w.r.t. these wires. A micrometric fiducialisation of the components and a micrometric alignment of the components on common supports will make the strategy of pre-alignment complete. In this paper, the global strategy of active pre-alignment is detailed and illustrated by the latest results demonstrating the feasibility of the proposed solution.

MOPO032	The Survey Status at NSRRC during the TPS Civil Construction	survey, alignment, site, photon	553
	H.M. Luo, J.-R. Chen, Chen, M. L. Chen, H.C. Ho, K.H. Hsu, W.Y. Lai, C.J. Lin, S.Y. Perng, P.L. Sung, Y.L. Tsai, T.C. Tseng, H.S. Wang NSRRC, Hsinchu, Taiwan
	In this paper, the survey status at NSRRC site duirng the TPS (Taiwan Photon Source) civil construction is described. The TLS (Taiwan Light Source) ring is still under operation in the meantime. In order to maintain the TLS for normal operation and also monitoring the building construction, an expanded survey setups including permanent leveling and GPS monuments were installed both on the site and TPS building. Combined with the orignal TLS survey sockets and sensor monitoring system (hydrostatic leveling system and precision inclination sensors) installed both in the TLS storage ring and beamlines, an extensive survey tasks were performed. The ground deformation situation of the TLS and deviation of the TPS building construction are presented.

MOPO034	From Survey Alignment toward Auto-alignment for the Installation of the TPS Storage Ring Girder System	laser, survey, alignment, photon	559
	T.C. Tseng, Chen, M. L. Chen, H.C. Ho, K.H. Hsu, W.Y. Lai, C.J. Lin, H.M. Luo, S.Y. Perng, P.L. Sung, Y.L. Tsai, H.S. Wang NSRRC, Hsinchu, Taiwan J.-R. Chen National Tsing Hua University, Hsinchu, Taiwan
	The TPS (Taiwan Photon Source) project is now under civil construction. The whole building is constructed half underground and 12m deep compared to the TLS due to the stability consideration, so the survey and alignment works are quite confined and difficult. For positioning the magnets precisely and quickly, a high accuracy auto-tuning girders system combined with survey network procedures were established to accomplish the installation tasks. The position data from the survey network will define a basis for the motorized girder system to auto-tune and improve the accuracy. A mockup of one twenty-fourth section (one cell) had been installed at NSRRC for interface examination and further testing. In this paper, the procedures from the traditional survey network to auto-aliment system design and algorithm are described. Meanwhile, a preliminary testing result is also included.

MOPO037	Concept of Femtosecond Timing and Synchronization Scheme at ELBE	laser, electron, status, pick-up	565
	M. Kuntzsch, A. Büchner, M. Gensch, A. Jochmann, T. Kirschke, U. Lehnert, F. Röser HZDR, Dresden, Germany M.K. Bock, M. Bousonville, M. Felber, T. Lamb, H. Schlarb, S. Schulz DESY, Hamburg, Germany
	The Radiation Source ELBE at Helmholtz-Zentrum Dresden-Rossendorf is undergoing an extension to offer capacity for various applications. The extension includes the setup of a THz-beamline with a dedicated laboratory and a beamline for electron-beam - high-power laser interaction. The current synchronization scheme offers stability on the picoseconds level. For pump-probe experiments using optical lasers, the desired synchronization between the pump and the probe pulse should be on the femtosecond scale. In the future there will be an optical synchronization system with a pulsed fiber laser as an optical reference. The laser pulses will be distributed over stabilized fiber links to the remote stations. It is planned to install EOM-based beam arrival time monitors (BAMs) in order to monitor the bunch jitter and to establish a beam-based feedback to reduce the jitter. Besides that, the timing system has to be revised to generate triggers for experiments with low repetition rate, two electron guns (thermionic DC, superconducting RF) and several lasers. The Poster will show the possible layout of the future Timing and Synchronization System at ELBE.

MOPO040	RF Reference Distribution for the Taiwan Photon Source	synchrotron, laser, diagnostics, LLRF	571
	K.H. Hu, Y.-T. Chang, J. Chen, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, S.Y. Hsu, C.H. Kuo, D. Lee, C.-Y. Liao, C.Y. Wu NSRRC, Hsinchu, Taiwan
	Taiwan Photon Source (TPS) is a low-emittance 3-GeV synchrotron light source with circumference of 518.4 m which is being under construction at National Synchrotron Radiation Research Center (NSRRC) campus. Low noise 500 MHz master oscillator and novel fiber based CW RF reference distribution system will be employed to take advantages of advanced technology in this field and deliver better performance. The preliminary test of the prototype system is summarized in this report.

MOPO041	Preliminary Testing of TPS Timing System	gun, linac, booster, EPICS	574
	C.Y. Wu, Y.-T. Chang, J. Chen, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Kuo, C.-Y. Liao NSRRC, Hsinchu, Taiwan
	The timing system of Taiwan Photon Source (TPS) provides synchronization for electron gun, modulators of linac, pulse magnet power supplies, booster power supply ramp, bucket addressing of storage ring, diagnostic equipments, beamline gating signal for top-up injection. The timing system utilizes a central event generator to generate events and distribute them over optic fiber network, and decodes them at the event receivers. The system supports uplink functionality which will be used for the fast interlock system to distribute signals like beam dump and post-mortem trigger. The timing system has now been in operation for Linac of TPS. This paper presents prototype for the timing system of TPS.

MOPS023	An Analytical Lagrangian Model for Analyzing Temperature Effects in Intense Non-neutral Beams*	emittance, simulation, focusing, space-charge	646
	E.G. Souza, A. Endler, R. Pakter, F.B. Rizzato IF-UFRGS, Porto Alegre, Brazil
	High-intensity charged-particle beams are used in several areas of physics. We can mention as an illustration, high-energy colliders, particle accelerators and vacuum electron devices. In all cases quoted above, the beam lose particles in the acceleration process, between its production to its final destination. These ejected particles, generally, produce a surrounding structure around the beam core, called halo. This undesirable structure is seen in simulation as well as in actual linacs, and its formation has been one of the main sources of energy loss in the acceleration devices. For this reason, the need for an advance in understand the mechanism that produce the halo becomes necessary. In view of the whole problem, we contruct a 1D Lagrangian warm-fluid model for describe the behavior of inhomogeneous charged-particle beam in solenoidal focusing magnetic field. The equations of motion are derived for an adiabatic process with a state equation originated from the ideal gas law. In the end, the model is compared with self-consistent simulation and is used to explain emittance growth and jets of particle, even when the system is out of equilibrium.

MOPS089	Identification of Bunch Dynamics in the Presence of E-cloud and TMCI for the CERN SPS Ring	simulation, feedback, coupling, kicker	811
	O. Turgut, J.D. Fox, C.H. Rivetta, S. Uemura SLAC, Menlo Park, California, USA W. Höfle CERN, Geneva, Switzerland
	Funding: Work is supported by the U.S. Department of Energy under contract DE-AC02-76SF00515 and the US LHC Accelerator Research Program (LARP). Measurements and multi-particle simulation codes (i.e. HEAD-TAIL, WARP, CMAD) indicate that bunched particle beams show unstable motions induced by electron-clouds and strong head-tail interactions. The bunch dynamics exhibits highly non-linear, complex and unstable behavior under certain operating conditions. Feedback control systems have been proposed to mitigate these instabilities in the CERN SPS ring. The design of feedback systems requires the knowledge of a reduced dynamic model of the bunch. It allows to include and quantify the effect of noise and signal perturbations, as well as system robustness to parameter variation. Identification techniques are used to estimate those models based on bunch motion measurements. In this work we present reduced mathematical models representing the transverse bunch dynamics and identification techniques to extract the model parameters based on measurements. These techniques are validated using time domain simulations of the bunch motion conducted using multi-particle simulation codes. For that, different sections of the bunch are driven by random signals, and the vertical motion of those areas is used to estimate the reduced model.

MOPZ011	An Automated Conditioning System for the MUCOOL Experiments at Fermilab	cavity, pick-up, vacuum, collider	844
	A. Kurup Imperial College of Science and Technology, Department of Physics, London, United Kingdom
	The MUCOOL project aims to study RF cavities for the Neutrino Factory and the Muon Collider. The large emittance muon beams in these accelerators require high-gradient RF cavities at low-frequencies and they need to operate in the presence of relatively strong magnetic fields. MUCOOL is conducting a number of tests on 805MHz and 201 MHz cavities in order to develop a technology that can meet all of these requirements. An automated conditioning system was developed for the 805MHz test program for MUCOOL. This system was designed to replicate the logic a human operator would use when conditioning an RF cavity and to provide automated logging of the conditioning process. This paper describes the hardware and software of the system developed.

MOPZ013	MAUS: MICE Analysis User Software	emittance, simulation, extraction, factory	850
	C.D. Tunnell JAI, Oxford, United Kingdom C.T. Rogers STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
	The Muon Ionization Cooling Experiment (MICE) is unique because it measures accelerator physics quantities using particle physics methods. It follows that the software that forms the theoretical model of MICE needs to be able to not only propagate beam envelopes and optical parameters but also model detector responses and matter effects for cooling. MICE addresses this dichotomy with the software framework MAUS in order to maximize its physics sensitivity whilst providing the conveniences of, for example, a common data structure. The diversity of challenges that MICE provides from the analysis perspective means that appropriately defining the software scope and layout is critical to the correctness and maintainability of the final accelerator physics analyses. MICE has structured its code into a Map-Reduce framework to enable better parallelization whilst also introducing unit, functional, and integration tests to ensure code reliability and correctness. These methods can apply to other experiments.

MOPZ024	Muon Ionization Cooling Experiment: Controls and Monitoring	EPICS, emittance, monitoring, target	856
	P.M. Hanlet IIT, Chicago, Illinois, USA C.N. Booth Sheffield University, Sheffield, United Kingdom
	Funding: NSF PHY0842798 The Muon Ionization Cooling Experiment (MICE) is a demonstration experiment to prove the viability of cooling a beam of muons for use in a Neutrino Factory and Muon Collider. The MICE cooling channel is a section of a modified Study II cooling channel which will provide a 10% reduction in beam emittance. In order to ensure a reliable measurement, we intend to measure the beam emittance before and after the cooling channel at the level of 1%, or an absolute measurement of 0.001. This renders MICE as a precision experiment which requires strict controls and monitoring of all experimental parameters in order to control systematic errors. The MICE Controls and Monitoring system is based on EPICS and integrates with the DAQ and Data monitoring systems. A description of this system, its implementation, and performance during recent muon beam data collection will be discussed. For the MICE collaboration.

TUODB03	Innovative Design of the Fast Switching Power Supplies for the SOLEIL EMPHU Insertion and its Fast Correctors	power-supply, undulator, simulation, permanent-magnet	982
	F. Bouvet, D. Aballea, R. Ben El Fekih, S. Bobault, M. Bol, Y. Bouanani, Y. Dietrich, A. Hardy, F. Marteau SOLEIL, Gif-sur-Yvette, France
	A new electromagnetic/permanent magnets helical undulator has been designed and is under commissioning at SOLEIL. For a fast switching of the photon polarization, it requires a power supply able to switch between +/350 A within 50 ms, without any current overshoot and with a very good current resolution over the full scale (50 ppm). The in-house design is based on two full switching bridges with interleaved commands. Combined with a regulation scheme using sophisticated algorithms, such a design enables to reach a high control bandwidth, permitting fast transitions. Such a fast and accurate system needs well performing digital control electronics. We chose the digital control cards developed at Paul Scherrer Institute (Villigen CH) for the SLS (Swiss Light Source). The components, measurements, interlocks, control interfaces, and electronic cards were developed and assembled together at SOLEIL. This paper will present the main lines of this development and the performances achieved during the EMPHU insertion commissioning. The design of the fast power supplies (±20 A) needed for corrector magnets of this insertion will also be presented.
	Slides TUODB03 [3.017 MB]

TUPC010	Status of the Manufacturing of Accelerating Structures for LINACs	linac, vacuum, extraction, laser	1009
	F.M. Mirapeix, J. Añel, J. Castillo, A. Ortiz HTS, Mendaro, Spain X. Aldalur, J. Amores, A. Urzainki DMP, Mendaro, Spain
	Funding: HTS, DMP, ZEHATZ, CERN Particle accelerators need ongoing development in the state of the art of the field: high-quality manufacturing of accelerating structures, PETS, but also drift tubes, bunchers, high-power couplers, alignment systems, precision test stands, etc. They also require engineering projects in the range of mechatronics, thermodynamics, microwaves, ultra high vacuum, cryogenics, joining techniques, high precision manufacturing, 3D high precision scanning, etc. HTS together with DMP are actually working on all this fronts. In this paper, the actual status of the manufacturing capabilities concerning some accelerating structures will be described.

TUPC031	Advanced Research Electron Accelerator Laboratory Based on Photocathode RF Gun	gun, electron, emittance, laser	1066
	B. Grigoryan, G.A. Amatuni, V.S. Avagyan, A. Grigoryan, M. Ivanyan, V.G. Khachatryan, E.M. Laziev, K. Manukyan, I.N. Margaryan, V. Sahakyan, A. Sargsyan, A. Tarloyan, A.V. Tsakanian, V.M. Tsakanov, A. Vardanyan CANDLE, Yerevan, Armenia T. Vardanyan YSU, Yerevan, Armenia
	The low energy sub-picosecond duration electron bunches with extremely small beam emittance have wide applications in advanced research of new accelerator concepts, radiation physics, time-resolved pulse radiolysis and electron diffraction. The conceptual design and experimental program of the Advanced Research Electron Accelerator Laboratory (AREAL) at CANDLE based on photocathode RF gun are presented. The AREAL design implies single and multibunch operation modes with variable beam energy of 5-20 MeV and 10-100 pC bunch charge. The design is based on 3 GHz 1.6 cells RF gun followed by S-Band accelerating linac.

TUPC042	First Beam to FACET	linac, electron, positron, vacuum	1093
	R.A. Erickson, C.I. Clarke, W.S. Colocho, F.-J. Decker, M.J. Hogan, S. Kalsi, N. Lipkowitz, J. Nelson, N. Phinney, P. Schuh, J. Sheppard, H. Smith, T.J. Smith, M. Stanek, J.L. Turner, J. Warren, S.P. Weathersby, U. Wienands, W. Wittmer, M. Woodley, G. Yocky SLAC, Menlo Park, California, USA
	Funding: This work was supported by the Department of Energy contract DE-AC02-76SF00515. The SLAC 3km linear electron accelerator has been reconfigured to provide a beam of electrons to the new FACET facility while simultaneously providing an electron beam to the Linac Coherent Light Source (LCLS). FACET is a new experimental facility constructed in the linac tunnel that can transport, compress, and focus electron bunches to support a variety of accelerator R&D experiments. In this paper, we describe our first experiences with the operation of the linac for this new facility.

TUPC089	New Digital NMR System for an Old Analyzing Magnet	power-supply, cyclotron, feedback, resonance	1215
	Z. Kormány, I. Ander ATOMKI, Debrecen, Hungary
	The analyzing magnet of the ATOMKI cyclotron measures the beam energy with high precision and can lower its energy spread to ~5x10^-4. The highly stable magnetic field is achieved by a NMR-feedback in the control loop of the power supply. The original analog system was designed and built over 25 years ago applying mainly obsolete, partly nowadays unavailable components. Maintaining and keeping the system running required increasing efforts every year. A new digital system has been developed to replace the old one. Except the high-frequency signal domain (HF oscillator and preamplifier) it performs every processing digitally. Its heart is a mixed-signal microcontroller that generates the signals for the NMR-probe, measures the amplitude and frequency of the oscillation, evaluates the demodulated signal and controls the power supply. A fast NMR-pulse detection algorithm was developed; as a result the embedded program can perform all measuring, detecting and controlling tasks in real-time. A PC connects to the controller, sends commands and displays the received signals and status data. The control software allows easy handling of the complete system with nearly automated operation.

TUPC115	Application of Libera Brilliance Single Pass at NSRL Linac BPM System	brilliance, linac, pick-up, injection	1284
	J.Y. Zou, J. Fang, P. Lu, T.J. Ma, B.G. Sun, Y.L. Yang, Z.R. Zhou USTC/NSRL, Hefei, Anhui, People's Republic of China
	Libera Brilliance Single Pass is a digital beam position processor with capabilities of single pass position measurement. This device can be used on the stripline beam position monitor (BPM) of the linac and transfer lines on light sources as well as injector system for the FELs. The linac of Hefei light source (HLS) was equipped with 2 stripline beam position monitors, which will be increased to 20 BPMs after upgrading. The existing BPM electronics were the homemade electronics with logarithm detector. To enhance the functionality of the BPM system, the Libera Brilliance Single Pass is employed to replace the existing BPM electronics. The newly buying devices have made test of characterization. The mapping of stripline BPM is made on a workbench with Libera Brilliance Single Pass. The beam position is tested at linac using Libera Brilliance Single Pass. And the results of these measurement performed on Libera are reported to compared to measurements with the linac’s existing BPM electronics.

TUPC116	Beam Diagnostics Global Data Warehouse Implementation and Application at SSRF*	diagnostics, EPICS, feedback, monitoring	1287
	Y.B. Leng, Z.C. Chen, Y.B. Yan, R.X. Yuan SSRF, Shanghai, People's Republic of China
	A fully functional beam diagnostics system has been developed at SSRF serving user operation and machine study since 2009. Global orbit disturbances, BPM failures and DCCT noise signal have been observed randomly. Without correct event trigger it is hard to capture real time data and analyze the cause of the above failures. A BI global data warehouse has been implemented as a solution to buffer online data and do correlation analyze at SSRF.

TUPC123	Evaluation of New Generation Heavy Particle Beam Diagnostics Instrumentation	hadron, single-bunch, instrumentation, diagnostics	1305
	B.B. Baricevic, A. Košiček, J. Menart, M. Znidarcic I-Tech, Solkan, Slovenia
	Abstract: This paper presents the achievements in the field of heavy particle beam diagnostics instrumentation. Two different instruments are presented: Libera Single Pass H and Libera Hadron, designed for linear and circular heavy particle beam diagnostics applications respectively. Beside high precision beam position measurement application, these instruments offer much more. Accurate beam arrival time measurements, high resolution single bunch position and charge measurements, beam current and fill pattern measurements are performed. The instruments are evaluated through extensive laboratory measurements, on the real beam and on stepper-motor driven test-benches. Libera instruments are network attached devices, developed on uTCA based platform that enables smooth integration of many instruments in the control system network and a simplified implementation of custom signal processing algorithms.

TUPC125	Test of the Front-end Electronics and Acquisition System for the LIPAC BPMs	EPICS, pick-up, linac, LLRF	1311
	D. Belver, I. Arredondo, P. Echevarria, J. Feuchtwanger, H. Hassanzadegan, M. del Campo ESS-Bilbao, Zamudio, Spain F.J. Bermejo Bilbao, Faculty of Science and Technology, Bilbao, Spain J.M. Carmona, A. Guirao, A. Ibarra, L.M. Martinez Fresno, I. Podadera CIEMAT, Madrid, Spain V. Etxebarria, J. Jugo, J. Portilla University of the Basque Country, Faculty of Science and Technology, Bilbao, Spain N. Garmendia, L. Muguira ESS Bilbao, Bilbao, Spain
	Funding: Work partially supported by Spanish Ministry of Science and Innovation under project AIC10-A-000441 and ENE2009-11230. Non-interceptive Beam Position Monitors pickups (BPMs) will be installed along the beamlines of the IFMIF/EVEDA linear prototype accelerator (LIPAC) to measure the transverse beam position in the vacuum chamber in order to correct the dipolar and tilt errors. Depending on the location, the BPMs response must be optimized for a beam of 175 MHz bunch repetition, an energy range from 5 up to 9 MeV, a current between 0.1 and 125 mA and continuous and pulse operation. The requirements from beam dynamics for the BPMs are quite stringent, aiming for the position an accuracy below 100 μm and a resolution below 10 μm, and for the phase an accuracy below 2° and a resolution below 0.3°. To meet these specifications, the BPM electronics system developed by ESS-Bilbao has been adapted for its use with the BPMs of LIPAC. This electronics system is divided in an Analog Front-End unit, where the signals are conditioned and converted to baseband, and a Digital Unit to sample them and calculate the position and phase. The electronics system has been tested at CIEMAT with a wire test bench and a prototype BPM. In this contribution, the tests performed will be fully described and the results discussed.

TUPC129	A Beam Position System for Hadrontherapy Facilities	electron, photon, vacuum, proton	1323
	A. Faus-Golfe, C. Belver-Aguilar, C. Blanch Gutierrez, J.J. García-Garrigós IFIC, Valencia, Spain E. Benveniste, M. Haguenauer, P. Poilleux LLR, Palaiseau, France
	Funding: MICINN-FPA:AIC10-D-000518 Essential parts of the needed instrumentation for the beam control in the Hadrontherapy accelerators are the Beam Position Monitors (BPM). The measurement of the beam position in Hadronterapy accelerators become more important at the secondary transport lines towards the patient room where this parameter must be completely determined. The BPM described in this paper is a new type of BPM based on four scintillating fibers coupled to four photodiodes to detect the light produced by the fibers when intercepting the beam. We present here the study of the different photodiodes able to read the light emitted by the scintillating fiber, the tests performed in order to find the most suitable photodiode to measure the beam position from the variations in the beam current, the mechanical design and the corresponding acquisition electronics.

TUPC134	Phase Detection Electronics for CLIC	pick-up, linac, luminosity, linear-collider	1338
	A. Andersson CERN, Geneva, Switzerland
	The Compact Linear Collider (CLIC) requires very tight RF phase synchronisation in order to preserve high luminosity. The electronics required for processing the signals delivered from the phase pick-ups present a significant challenge. This paper discusses the strategy adopted to achieve a sufficiently accurate measurement of the phase. Performance measurements performed in the lab of some of the sub-systems are also presented.

TUPC143	New Techniques in the Synchronization of High-frequency Multichannel Acquisition Systems	instrumentation, neutron, background, induction	1359
	R.A.J. Soden, Y.A. Maumary, C. Zaretti Agilent Technologies SA, Plan-les-Ouates, Switzerland S.J. Narciso, J.L. Richard Agilent Technologies Inc., Loveland, USA
	Today, high-speed digitizer systems operating at well above 100 MSa/s are being used in a diverse range of applications including operation of single-pulse linear induction accelerators for flash radiographic facilities, neutron energy measurement through time-of-flight, and propulsion research. A growing number of such applications require simultaneous measurement of high-frequency signals over many channels. Most of today’s high-speed digitizers or oscilloscopes feature a maximum of only four channels. For applications requiring more than four channels, and needing very precise time correlation between channels or accurate phase of continuous signals, it is necessary to synchronize the sampling clocks of the multiple instruments within the system. This paper presents methods of synchronization, with reference to large-scale multichannel data acquisition requirements in particle acceleration applications using modular instrumentation. A range of system architectures are presented, and advantages and disadvantages of each scheme are discussed.

TUPC144	Preliminary BPM Electrics Testing for the Taiwan Photon Source Project	injection, brilliance, electron, feedback	1362
	C.H. Kuo, J. Chen, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, K.H. Hu, C.-Y. Liao NSRRC, Hsinchu, Taiwan
	The preliminary BPM electrics are developing and testing for Taiwan Photon Source (TPS), is a 3 GeV synchrotron light source which being in construction at NSRRC. This new BPM electronics with integrated FPGA based hardware, and will be testing in the TLS (Taiwan Light Source) with real beam at first. The enhance functionality of current generation will be adopted in the TPS. The electronic prototype testing and relative property will be reported in this report.

TUPC145	Vibration and Beam Motion Monitoring in TLS	EPICS, monitoring, photon, brilliance	1365
	Y.K. Chen, J. Chen, P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Kuo NSRRC, Hsinchu, Taiwan
	Due to asynchronous nature of various vibration and beam motion related subsystems, it is hard to analysis the correlation between them. Therefore, the synchronous distributed data acquisition system is designed to make an improvement for better analysis. For different circumstances, the system supports two data flow: one is display the real-time data which could be archived continuously and the other is waveform which could be acquired on demand or triggered by event with high sampling rate. In addition, the viewer will improve some useful features, such as trigger by customize signal or EPICS PV record, automatic screenshot and plot the multiple history events. The preliminary test results and implementation details will be summarized in this report.

TUPC147	A Micro-Channel Plate Based Gas Ionization Profile Monitor with Shaping Field Electrodes for the ISIS H⁻ Injector	ion, vacuum, radiation, beam-losses	1371
	P.G. Barnes, G.M. Cross, B.S. Drumm, S.A. Fisher, S.J. Payne, A. Pertica, C.C. Wilcox STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
	Beam profile measurements within the ISIS H⁻ injector line are achieved using destructive devices such as moving wire scanners. To avoid damage to the wires, measurements are made with the injector operating on reduced power. This paper reports the development of a Micro-Channel Plate based profile monitor which allows beam measurements to be made under normal operating conditions. The monitor produces profiles by measuring the +ion current resulting from the interaction of the H⁻ beam with the surrounding residual gas. The 32 channel Micro-Channel Plate is mounted on a rotating arm to enable it to be positioned parallel to the beam for calibration (all channels then measure the same +ion current) and perpendicular to the beam for profile measurements. A 15kV drift field is used together with field shaping electrodes to ensure a flat electric field gradient across the monitor, thereby minimising distortion of the profile due to the electric field. This paper details all aspects of the design and construction of this profile monitor. Beam profiles are compared to previous wire scanner results. Shaping field upgrades are discussed to improve the longitudinal field shape.

TUPS001	Upgrade of the ESRF Vacuum System	vacuum, storage-ring, cathode, synchrotron	1515
	M. Hahn, J.C. Biasci, H.P. Marques, A. Meunier ESRF, Grenoble, France
	The upgrade program of the ESRF concerns in terms of electron storage ring vacuum chambers mainly the insertion device (ID) sectors. Here the length available for the production of intense synchrotron light is being increased from five to six or even seven meters. The presence of canted ID sectors where two independent synchrotron light beams will be produced in the same straight section requires new quadrupole chambers compatible with the new geometry. A number of long insertion device vacuum chambers for the new ID sectors has already been produced by ESRF and coated with non-evaporable getter (NEG) material, a new generation of in vacuum undulators for the extended ID sections are under preparation. This paper outlines the status of the modification of the vacuum system and informs about consequences for the ESRF NEG coating activity and some recent improvements of the vacuum measurement and control system.

TUPS003	Upgrade of the ESRF RGA System	vacuum, diagnostics, monitoring, survey	1521
	A. Meunier, M. Hahn, I. Parat, J.L. Pons ESRF, Grenoble, France
	In the frame of the ESRF upgrade program, the Residual Gas Analyzer (RGA) system has been reviewed. A campaign of RGA refurbishment has been started recently giving more reliability and accuracy on partial pressure vacuum control. Based on new technologies and our operating experience, new RGA monitoring application and diagnostic tools have been developed. This paper outlines the evolution of the actual RGA system focusing on the controlled hardware installation description, on software and user interface developments. The continuous follow up of a defined number of partial pressure measurements using different dynamic control modes will be described.

TUPS007	Construction and Test of a Cryocatcher Prototype for SIS100*	ion, vacuum, heavy-ion, beam-losses	1527
	L.H.J. Bozyk, D.H.H. Hoffmann TU Darmstadt, Darmstadt, Germany H. Kollmus, P.J. Spiller, M. Wengenroth GSI, Darmstadt, Germany
	Funding: EU-FP-7 project COLMAT, FIAS The main accelerator, SIS100, of the FAIR-facility will provide heavy ion beams of highest intensities. Ionization beam loss is the most important loss mechanism at operation with high intensity, intermediate charge state heavy ions. A special synchrotron design has been developed for SIS100, aiming for hundred percent control of ionization beam loss by means of a dedicated cold ion catcher system. To suppress dynamic vacuum effects, the cryo catcher system shall also provide a significantly reduced effective desorption yield. The construction and tests of a prototype cryo ion catcher is a workpackage of the EU-FP-7 project COLMAT. A prototype test setup including cryostat has been constructed, manufactured and tested at GSI under realistic conditions with heavy ion beams of the of the heavy ion synchrotron SIS18. The design and results are presented.

TUPS020	Leak Tightness of LHC Cold Vacuum Systems	vacuum, cryogenics, superconducting-magnet, proton	1566
	P. Cruikshank, S.D. Claudet, W. Maan, L. Mourier, A. Perrier-Cornet, N. Provot CERN, Geneva, Switzerland
	The cold vacuum systems of the LHC machine have been in operation since 2008. While a number of acceptable helium leaks were known to exist prior to cooldown and have not significantly evolved over the last years, several new leaks have occurred which required immediate repair activities or mitigating solutions to permit operation of the LHC. The LHC vacuum system is described together with a summary and timetable of known air and helium leaks and their impact on the functioning of the cryogenic and vacuum systems. Where leaks have been investigated and repaired, the cause and failure mechanism is described. We elaborate the mitigating solutions that have been implemented to avoid degradation of known leaks and minimize their impact on cryogenic operation and LHC availability, and finally a recall of the consolidation program to be implemented in the next LHC shutdown.

TUPS024	Development of Beryllium Vacuum Chamber Technology for the LHC	vacuum, electron, collider, background	1578
	R. Veness CERN, Geneva, Switzerland C. Dorn, G. Simmons Materion Electrofusion, Fremont, California, USA
	Beryllium is the material of choice for the beam vacuum chambers around collision points in particle colliders due to a combination of transparency to particles, high specific stiffness and compatibility with ultra-high vacuum. New requirements for these chambers in the LHC experiments have driven the development of new methods for the manufacture of beryllium chambers. This paper reviews the requirements for experimental vacuum chambers. It describes the new beryllium technology adopted for the LHC and experience gained in the manufacture and installation.

TUPS029	Development of a Feedthrough with Small Reflection for the TPS BPM	impedance, synchrotron, vacuum	1593
	Huang, Y.T. Huang, C.-C. Chang, C.L. Chen, G.-Y. Hsiung, S-N. Hsu, H.P. Hsueh NSRRC, Hsinchu, Taiwan J.-R. Chen National Tsing Hua University, Hsinchu, Taiwan
	The TPS BPM feedthrough is a coaxial cable with a structure of a kind for which power loss occurs readily at places at which exists an impedance mismatch. With an impedance equation for a simple coaxial cable combined with a multi-dielectric modification, a model feedthrough with small reflection has been designed. With careful setting of brazing conditions and precise control of the dimensions of devices, a TPS prototypical BPM feedthrough having a reflection coefficient less than 0.05 was manufactured. The eccentricity was constrained within 0.03 mm, and the deviation of measured capacitance of button electrodes was less than 7 %.

TUPS037	Preliminary Assessment of Beam Impact Consequences on LHC Collimators	simulation, proton, collimation, beam-losses	1617
	M. Cauchi, R.W. Assmann, A. Bertarelli, R. Bruce, F. Carra, A. Dallocchio, D. Deboy, N. Mariani, A. Rossi, N.J. Sammut CERN, Geneva, Switzerland M. Cauchi, P. Mollicone UoM, Msida, Malta L. Lari IFIC, Valencia, Spain
	The correct functioning of the LHC collimation system is crucial to attain the desired LHC luminosity performance. However, the requirements to handle high intensity beams can be demanding. In this respect, the robustness of the collimators plays an important role. An accident which causes the proton beam to hit a collimator might result in severe beam-induced damage and, in some cases, replacement of the collimator, with consequent downtime for the machine. In this paper, several case studies representing different realistic beam impact scenarios are shown. A preliminary analysis of the thermal response of tertiary collimators to beam impact is presented, from which the most critical cases can be identified. Such work will also help to give an initial insight on the operational constraints of the LHC by taking into account all relevant collimator damage limits.

TUPS040	Driving the LHC Collimators' Stepping Motors over 1 km with High Accuracy avoiding EMI Effects	feedback, impedance, beam-losses, radiation	1626
	A. Masi, G. Conte, R. Losito, M. Martino CERN, Geneva, Switzerland
	The LHC collimators are exposed to very high levels of radiation, which means that the power drivers must be installed far from the stepping motors that they drive. Due to the geometry of the underground installations, the distances can be up to 1 km. The long cables that connect the drivers to the motors behave as transmission lines modifying dramatically the impedance seen by the drivers and consequently jeopardizing the control performance of Pulse Width Modulation (PWM) drivers. In this paper we address this problem, provide an analytical model of the driver-cable-motor system and describe the analog solution we have developed to improve the performance of a typical off the shelf driver. Finally we characterize the improvement of the performances with measurements of positioning repeatability and show that electromagnetic emissions from the long cables are drastically reduced, making the use of stepping motors compatible with extremely sensitive instrumentation such as the LHC Beam Loss Monitors (BLM).

TUPS051	Design and Performance of the MICE Target*	target, acceleration, extraction, vacuum	1644
	C.N. Booth, P. Hodgson, E. Overton, M. Robinson, P.J. Smith Sheffield University, Sheffield, United Kingdom G.J. Barber, K.R. Long Imperial College of Science and Technology, Department of Physics, London, United Kingdom E.G. Capocci, J.S. Tarrant STFC/RAL, Chilton, Didcot, Oxon, United Kingdom B.J.A. Shepherd STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
	Funding: UK Science and Technology Facilities Council The MICE experiment uses a beam of low energy muons to study ionisation cooling. This beam is derived parasitically from the ISIS synchrotron at the Rutherford Appleton Laboratory. A mechanical drive has been developed which rapidly inserts a small titanium target into the beam after acceleration and before extraction, with minimal disturbance to the circulating protons. One mechanism has operated in ISIS for over half a million pulses, and its performance will be summarised. Upgrades to this design have been tested in parallel with MICE operation; the improvements in performance and reliability will be presented, together with a discussion of further future enhancements.

TUPS052	An FPGA Based Controller for the MICE Target	target, injection, extraction, EPICS	1647
	P.J. Smith, C.N. Booth, P. Hodgson, E. Overton, M. Robinson Sheffield University, Sheffield, United Kingdom J. Leaver, K.R. Long Imperial College of Science and Technology, Department of Physics, London, United Kingdom
	Funding: UK Science and Technology Facilities Council The MICE experiment uses a beam of low energy muons to test the feasibility of ionization cooling. This beam is derived parasitically from the ISIS accelerator at the Rutherford Appleton Laboratory. A target mechanism has been developed that rapidly inserts a small titanium target into the circulating proton beam immediately prior to extraction without unduly disturbing the primary ISIS beam. The original control electronics for the MICE target was based upon an 8-bit PIC. Although this system was fully functional it did not provide the necessary IO to permit full integration of the target electronics onto the MICE EPICS system. A three phase program was established to migrate both the target control and DAQ electronics from the original prototype onto a fully integrated FPGA system that is capable of interfacing with EPICS through a local PC. This paper discusses this upgrade program, the motivation behind it and the performance of the upgraded target controller.

TUPS061	CERN Safety Alarm Monitoring	monitoring, site, fibre-optics, power-supply	1674
	H. Nissen, S. Grau CERN, Geneva, Switzerland
	The CERN Safety Alarm Monitoring system acquires safety alarms and safety information generated by CERN safety equipment such as fire and gas detectors, evacuation, emergency stops and other safety related systems, which are located in both surface and underground areas of CERN sites and accelerators. Currently there are 22170 alarms from 10²⁵ safety equipments. This information is transmitted in a high priority and diversely redundant way to the CERN Safety Control Room for immediate intervention of the CERN Fire Brigade. The system was designed based on two main standards, the EN 50136 and IEC 61508 and was commissioned in 2003. In 2009 it was decided to launch a consolidation project in order to upgrade both hardware and software. The consolidation project includes deployment of a private CERN wide fiber optic TCP/IP network for the transmission of safety alarms, an upgrade of the SCADA software, a database upgrade and the replacement of all computers. In this paper the system is presented, the ongoing consolidating work is detailed and the middle and long term improvement plans for the system are described.

TUPS063	Power Saving Schemes in the NSRRC	synchrotron, synchrotron-radiation, status, radiation	1680
	J.-C. Chang, Y.F. Chiu, J.-M. Lee, Y.-C. Lin, C.Y. Liu, Z.-D. Tsai, T.-S. Ueng NSRRC, Hsinchu, Taiwan
	National Synchrotron Radiation Research Center (NSRRC), Taiwan will complete the construction of the civil and utility system engineering of the Taiwan Photon Source (TPS) in the end of 2012. The power consumption of the TPS is estimated about 2.3 times of that of the existed Taiwan Light Source (TLS). To cope with increasing power requirement in the near future, we have been conducting several power saving schemes, which include power requirement control, optimization of chillers operation, application of heat pump, air conditioning system improvement, power factor improvement and the lighting system improvement.

TUPS064	Construction Status of the Utility System for the 3GeV TPS Storage Ring	storage-ring, status, booster, power-supply	1683
	J.-C. Chang, J.-R. Chen, Y.-C. Chung, C.K. Kuan, K.C. Kuo, J.-M. Lee, Y.-C. Lin, C.Y. Liu, I. Liu, Z.-D. Tsai NSRRC, Hsinchu, Taiwan
	The construction of the utility system for the 3.0 GeV Taiwan Photon Source (TPS) has been contracted out in the end of 2009. The whole construction of the utility system is scheduled to be completed in the end of 2012. Total budget of this construction is about four million dollars. The utility system includes the electrical power, cooling water, air conditioning, compressed air and fire control systems. The TPS construction site is located adjacent to TLS. Some areas of TPS and TLS are overlapped. Under tight schedule, limit budget and geographic constrains, it is a challenge to complete the utility system construction of TPS on time, on budget, and to specification. This paper presents some main issues and status of the utility system construction for the TPS storage ring.

TUPS065	Design of the De-ionized Water Treatment for Taiwan Photon Source	ion, status, storage-ring, photon	1686
	Z.-D. Tsai, W.S. Chan, C.K. Kuan NSRRC, Hsinchu, Taiwan
	This work presents the water treatment design of Taiwan Photon Source (TPS). The system design is influenced by supplied water quality, water quantity and the selected process scheme. The system is composed of a pretreatment, make-up, and points-of-use filtration systems. The pretreatment system consists of an active carbon tower, a normally cartridge filter and a reversed osmosis (RO) unit. Furthermore, the make-up system consists of an ultraviolent (UV) TOC reduction unit and a ion-exchange resin unit. Following the water treatment process, the proposed system can provide high quality de-ionized water whose resistivity is better than 10 MΩ-cm at 25±0.1 degree C and dissolved oxygen is less than 10 ppb.

TUPS066	Design of Front End Safety Interlock System for Taiwan Photon Source	photon, radiation, status, vacuum	1689
	H.Y. Yan, J.-R. Chen, G.-Y. Hsiung, C.K. Kuan, I.C. Sheng, Z.-D. Tsai NSRRC, Hsinchu, Taiwan
	Safety interlock is one of critical subsystems in synchrotron radiation accelerator. A front end (FE) interlock prototype system has been designed, fabricated, and initially tested for Taiwan Photon Source (TPS). TPS FE interlock logic is designed based on that of Taiwan Light Source (TLS), and moderately modified due to the accelerator parameter discrepancy between TPS and TLS. The programmable automation controllers (PAC) have been utilized in FE safety interlock system for their reliability, convenience, processing capability, communication, and stability in user interface. In FE PAC system, touch panels are used as the graphical user interface (GUI) to control and monitor FE components. In addition, with GUI control it is used to beam position monitoring devices as well as confined beam sizes aperture for beam line users. The interlock design such as data acquisition and parameters monitoring for vacuum pressure, flow rate of cooling water, pressure of compressive air, chamber and water temperature, and overall interlock logic are also presented in this paper.

TUPS068	The GSI RF Maintenance & Diagnostics Project	LLRF, diagnostics, status, cavity	1695
	K.-P. Ningel, H. Klingbeil, B. Zipfel GSI, Darmstadt, Germany A. Honarbacht, M. Proske Ubisys Technologies GmbH, Düsseldorf, Germany H. Veldman LogiTrue, Polokwane, South Africa
	From time-to-time, microcontroller- and FPGA-based LLRF electronics devices need maintenance of firmware and configuration data. The system described here allows this and also long term monitoring of functionality and performance. Both requirements cover measuring devices that operate under a common operating system as well as modules only addressable by means of GPIOs or their programming interface. For large accelerator systems like in the FAIR project, a Web-based remotely controlled system was designed in close collaboration with two industrial partners. To cover the requirements of the extremely different types of participating modules while remaining flexible for future extensions, the system was designed with a maximum of modularity and a strong focus on high reliability and safety. This contribution describes the global structure and the actual status of the RF Maintenance and Diagnostics System. Several types of measuring equipment and LLRF modules such as a phase control loop system and an IF signal pre-processing system have been integrated.

TUPS076	The Specification Process for the Large Scale Accelerator Project FAIR	alignment, survey, antiproton, target	1713
	U. Weinrich GSI, Darmstadt, Germany
	The project FAIR is a large scale international accelerator facility with a high complexity within the accelerator complex. The project is owned by the recently founded FAIR GmbH while the physical-technical layout of the accelerator part of the facility is under the responsibility of GSI. This is the so-called two company model. Most of the accelerator subsystems and components are foreseen to be delivered In-Kind by accelerator institutes from Europe and Asia. In addition direct procurement is foreseen for those components not covered by in-kind-contributions or being very critical in time. Furthermore procurement has already started of components covered by special agreements and funding.

TUPS082	The LEBT Chopper for the Spiral 2 Project	ion, vacuum, high-voltage, target	1731
	A.C. Caruso, F. Consoli, G. Gallo, D. Rifuggiato, E. Zappalà INFN/LNS, Catania, Italy M. Di Giacomo GANIL, Caen, France A. Longhitano ALTEK, San Gregorio (CATANIA), Italy
	The Spiral 2 driver uses a slow chopper situated in the common section of the low energy beam transport line to change the beam intensity, to cut off the beam in case of critical loss and to avoid hitting the wheel structure of rotating targets. The device has to work up to 10 kV, 1 kHz repetition frequency rate and its design is based on standard power circuits, custom alarm board and vacuum feed-through. The paper summarizes the design principles and describes the test results of the final device which has been installed on the beam line test bench.

TUPS084	Development Status of PPS, MPS and TS for IFMIF/EVEDA Prototype Accelerator	radiation, status, beam-losses, monitoring	1734
	H. Takahashi, T. Kojima, T. Narita, K. Nishiyama, H. Sakaki, K. Tsutsumi JAEA, Aomori, Japan
	Control System for IFMIF/EVEDA* prototype accelerator consists of six subsystems; Central Control System (CCS), Local Area Network (LAN), Personnel Protection System (PPS), Machine Protection System (MPS), Timing System (TS) and Local Control System (LCS). The IFMIF/EVEDA prototype accelerator provides deuteron beam with the power more than 1 MW, which is as same as that in cases of J-PARC and SNS. Then, the PPS is required to protect technical and engineering staff against unnecessary exposure and the other danger phenomena. The MPS and the TS are strongly required a high performance and precision to avoid radio-activation of the accelerator components. To realize these requirements, the PPS designed that Programmable Logic Controllers (PLCs) are used mainly, and a sequence is programmed for entering and leaving of controlled area and etc. Hardware and logic sequences for the MPS are designed to realize the beam inhibition time within 30 micro-seconds. The TS prototype modules were designed and tested using 10 MHz master clock and 100 Hz reference trigger. This article presents the PPS, MPS and TS design in details. * International Fusion Material Irradiation Facility / Engineering Validation and Engineering Design Activity

TUPS089	HI-13 Tandem Accelerator Radiation Protection System	radiation, tandem-accelerator, monitoring, status	1749
	X.F. Wang, Y.M. Hu CIAE, Beijing, People's Republic of China
	In HI-13 Tandem Accelerator laboratory, a new radiation protection system has been built Which composed of 7 protective door control units and 7 emergency alarms , 23 groups of indicators,17 groups of workshop-empty units , L.E and IMAG Faraday cups as well as computer control and display system . Pre-empty process is prerequisite before close the protective doors to ensure nobody be exposed on irradiation environment otherwise the door-open would be disabled. Even thought somebody left, pushing nearby alarm button and emergency door-open button will induce glittery signal and simultaneous door-openning. L.E and IMAG Faraday cups execute immediate beam interruption once accidence occured . The distributed indicators indicate real time status of all the work fields. All above devices and units are interlocked follow some complex but logical protective rules. Computer workstation is built and accordingly, after full information and operation action signals are collected and transferred, the software can complete full-sides status monitoring, provide convenient control and display interfaces as well as pop adequate prompt frames.

TUPS098	Machining and Characterizing X-band RF-structures for CLIC	cavity, damping, collider, electron	1768
	S. Atieh, M. Aicheler, G. Arnau-Izquierdo, A. Cherif, L. Deparis, D. Glaude, L. Remandet, G. Riddone, M. Scheubel CERN, Geneva, Switzerland D. Gudkov, A. Samoshkin, A. Solodko JINR, Dubna, Moscow Region, Russia
	The Compact Linear Collider (CLIC) is currently under study at CERN as a potential multi-TeV e+e collider. The manufacturing and assembling tolerances for making the required RF components are essential for CLIC to perform efficiently. Machining techniques are relevant to the construction of ultra-high-precision parts for the Accelerating Structures (AS). Optical-quality turning and ultra-precision milling using diamond tools are the main manufacturing techniques identified to produce ultra-high shape accuracy parts. A shape error of less than 5 micrometres and roughness of Ra 0.025 are achieved. Scanning Electron Microscopy (SEM) observation as well as sub-micron precision Coordinate Measuring Machines (CMM), roughness measurements and their crucial environment were implemented at CERN for quality assurance and further development. This paper focuses on the enhancements of precision machining and characterizing the fabrication of AS parts.

TUPS100	Manufacturing the Linac4 PI-mode Structure Prototype at CERN	cavity, linac, vacuum, alignment	1774
	G. Favre, A. Cherif, A. Dallocchio, J.-M. Geisser, L. Gentini, F. Gerigk, S.J. Mathot, M. Polini, S. Sgobba, T. Tardy, R. Wegner CERN, Geneva, Switzerland
	The PI-Mode Structure (PIMS) of Linac4 consists of 7-cell cavities made from alternating OFE copper discs and rings welded together with electron beam (EB) welding. A full-scale prototype cavity of almost 1.5 m in length has been manufactured, assembled, and tested at CERN to prepare the series production of 12 PIMS cavities as part of an international collaboration. This paper reports on the construction experience including machining operations, EB welding, vacuum brazing, and metrological measurements results.

TUPS101	A Fast 650V Chopper Driver	linac, impedance, status, kicker	1777
	M.M. Paoluzzi CERN, Geneva, Switzerland
	In the framework of Linac4 and the Superconducting Proton Linac (SPL) studies at CERN, the design for a beam chopper has been carried out. The chopper is basically a kicker that deviates part of the beam towards a dump. It is made of two 50 Ω, slow wave lines facing each other, matching the beam velocity and driven with a minimum of 500 V. Due to the bunch spacing of 2.84 ns, a system rise and fall time (3 %-90 %) below 2.5 ns is required with pulse lengths ranging from 8 ns to hundreds of μs. Although different solutions for the driver amplifier where devised in the past, none of the achievements was entirely satisfactory. This paper describes a new design and prototype that meets all the required specifications.

TUPS102	Design of an FPGA-based Radiation Tolerant Agent for WorldFIP Fieldbus	radiation, target, simulation, status	1780
	G. Penacoba Fernandez, P. Alvarez, E. Gousiou, S.T. Page, J.P. Palluel, J. Serrano, E. Van der Bij CERN, Geneva, Switzerland
	CERN makes extensive use of the WorldFIP field-bus interface in the LHC and other accelerators in the pre-injectors chain. Following the decision of the provider of the components to stop the developments in this field and foreseeing the potential problems in the subsequent support, CERN decided to purchase the design information of these components and in-source the future developments using this technology. The first in-house design concerns a replacement for the MicroFIP chip whose last version was manufactured in an IC feature size found to be more vulnerable to radiation of high energy particles than the previous versions. NanoFIP is a CERN design based on a Flash FPGA implementing a subset of the functionality allowed by the communication standard, fitting the requirements of the different users and including the robustness against radiation as a design constraint. The development presented involved several groups at CERN working together in the framework of the Open Hardware Repository collaboration, and aiming at maximizing the interoperability and reliability of the final product.

TUPZ019	Transverse Emittance Preservation through the LHC Cycle	emittance, injection, luminosity, extraction	1843
	V. Kain, B. Goddard, B.J. Holzer, J.M. Jowett, M. Meddahi, T. Mertens, F. Roncarolo CERN, Geneva, Switzerland
	The preservation of the transverse emittance is crucial for luminosity performance. At the LHC design stage the total allowed emittance increase was set to 7% throughout the LHC cycle. The proton run in 2010 showed that the injectors can provide beams with smaller emittances than nominal and higher bunch intensities. The LHC parameters are well under control and the emittances are kept below nominal until physics. The LHC luminosity goals for the first year of running could therefore be achieved with fewer bunches than initially foreseen. This paper will report on the measured emittance growth at injection from the SPS and the evolution of the emittance through the entire LHC cycle. Sources and possible cures for the observed emittance growth will be discussed.

TUPZ022	Longitudinal Beam Measurements at the LHC: The LHC Beam Quality Monitor	injection, pick-up, emittance, damping	1852
	G. Papotti, T. Bohl, F. Follin, U. Wehrle CERN, Geneva, Switzerland
	The LHC Beam Quality Monitor is a system that measures individual bunch lengths and positions, similarly to the twin system SPS Beam Quality Monitor, from which it was derived. The pattern verification that the system provides is vital during the injection process to verify the correctness of the injected pattern, while the bunch length measurement is fedback to control the longitudinal emittance blow up performed during the energy ramp. In 2010 the system could for example clearly detect instances of longitudinal instabilities and beam excitation due to excess RF noise. The algorithms used, the hardware implementation and the system integration in the LHC control infrastructure are presented in this paper, along with possible improvements.

TUPZ025	Experience with Offset Collisions in the LHC	luminosity, target, emittance, beam-losses	1858
	G. Papotti, R. Alemany-Fernandez, F. Follin, R. Giachino, W. Herr, T. Pieloni, M. Schaumann CERN, Geneva, Switzerland R. Calaga, R. Miyamoto BNL, Upton, Long Island, New York, USA
	To keep the luminosity under control, some experiments require the adjustment of the luminosity during a fill, so-called luminosity leveling. One option is the separate the beams transversely and adjust the separation to the desired collision rate. The results from controlled experiments are reported and interpreted. The feasibility of this method for ultimate luminosities is discussed.

TUPZ028	Beam Based Optimization of the Squeeze at the LHC	feedback, optics, beam-losses, simulation	1867
	X. Buffat EPFL, Lausanne, Switzerland M. Lamont, S. Redaelli, J. Wenninger CERN, Geneva, Switzerland
	The betatron squeeze is a critical operational phase for the LHC because it is carried out at top energy, with the maximum stored energy and with reduced aperture margins in the superconducting triplets. A stable operation with minimum beam losses must be achieved in order to ensure a safe and efficient operation. The operational experience at the LHC showed that this is possible. The operation in 2010 is reviewed. In particular, orbit, tune and chromaticity measurements are investigated and correlated to beam losses. Different optimizations are then proposed towards a more efficient and robust operation. The improvements obtained for the operation in 2011 are presented.

TUPZ030	Simulation of Linear Beam Parameters to Minimize the Duration of the Squeeze at the LHC	optics, simulation, collider, acceleration	1873
	X. Buffat EPFL, Lausanne, Switzerland G.J. Müller, S. Redaelli, M. Strzelczyk CERN, Geneva, Switzerland
	The betatron squeeze allows to increase the luminosity of a collider by reducing the β function at the interaction points. This operation has shown to be very critical in previous colliders. In this state of mind, the squeezing was performed extremely safely during the first year of operation of the Large Hadron Collider, at the expense of the duration of the process. As the turnaround time is a relevant parameter for the integrated luminosity, a squeeze of shorter duration is proposed for 2011 and further. MadX simulation of linear beam parameters based on settings extracted from the LHC control system are used to justify the proposal. Further optimization of the squeeze setting generation is also discussed.

TUPZ035	RHIC Polarized Proton Status and Operation Highlights	polarization, resonance, feedback, emittance	1888
	H. Huang, L. A. Ahrens, I.G. Alekseev, E.C. Aschenauer, G. Atoian, M. Bai, A. Bazilevsky, M. Blaskiewicz, J.M. Brennan, K.A. Brown, D. Bruno, A. Dion, K.A. Drees, W. Fischer, J.W. Glenn, X. Gu, L.T. Hoff, C. Liu, Y. Luo, W.W. MacKay, Y. Makdisi, G.J. Marr, A. Marusic, F. Méot, M.G. Minty, C. Montag, J. Morris, A. Poblaguev, V. Ptitsyn, G. Robert-Demolaize, T. Roser, W.B. Schmidke, V. Schoefer, D. Smirnov, S. Tepikian, J.E. Tuozzolo, G. Wang, K. Yip, A. Zaltsman, A. Zelenski, S.Y. Zhang BNL, Upton, Long Island, New York, USA D. Svirida ITEP, Moscow, Russia
	RHIC operation as the polarized proton collider presents unique challenges since both luminosity and spin polarization are important. A lot of upgrades and modifications have been made since last polarized proton operation. A 9 MHz rf system has been installed to improve longitudinal match at injection and to increase luminosity. A vertical survey of RHIC was performed before the run to get better magnet alignment. The orbit control has also been improved this year. AGS polarization transfer efficiency is improved by a horizontal tune jump system. To preserve polarization on the ramp, a new working point was chosen with the vertical tune near a third order resonance. The orbit and tune control are essential for polarization preservation. To calibrate the polarization level at 250 GeV, polarized protons were accelerated up to 250GeV and decelerated back to 100GeV. The tune, orbit and chromaticity feedback is essential for this operation. The new record of luminosity was achieved with higher polarization at 250 GeV in this run. The overview of the changes and operation results are presented in this paper.

WEIB01	Chasing Femtoseconds – How Accelerators Can Benefit from Economies of Scale in Other Industries	laser, optics, scattering, polarization	1973
	M. Vidmar, J. Tratnik University of Ljubljana, Faculty of Electrical Engineering, Ljubljana, Slovenia P.L. Lemut COBIK, Solkan, Slovenia
	Building accelerators we frequently push the limits of what is possible in terms of performance. When trying to solve a very challenging engineering problem, we normally resort to specialization; we narrow our focus. This talk suggests a possible alternative path. Huge benefits and great results can be achieved by combining creative ideas and approaches with ideas and solutions borrowed from the economies of scale like telecommunications. The aim of the talk is to show possibilities for combining ideas, technologies and components from different industries into innovative products.
	Slides WEIB01 [0.799 MB]

WEIB02	Towards Developing Accelerators in Half the Time	feedback, alignment, target, background	1978
	D.G. Reinertsen Reinertsen & Associates, Redondo Beach, California, USA
	The talk challenges conventional wisdom about how to improve product development processes and broadens the concept of product development cycle time reduction techniques. It provides some original ideas; it discusses approaches to managing product architecture that are well suited for rapid development and how the engineering concepts of system architecture, queuing theory, feedback theory, and information theory can be applied to manage the product development management.
	Slides WEIB02 [0.159 MB]

WEIB03	Emerging New Electronics Standards for Physics	instrumentation, status, monitoring, diagnostics	1981
	R.S. Larsen SLAC, Menlo Park, California, USA
	Funding: Work supported by US Department of Energy Contract DE AC03 76SF00515. A unique effort is underway between industry and the international physics community to extend the Telecom industry’s Advanced Telecommunications Computing Architecture (ATCA and MicroTCA) to meet future needs of the physics machine and detector community. New standard extensions for physics are being designed to deliver unprecedented performance and high subsystem availability for accelerator controls, instrumentation and data acquisition. A key feature is a unique out-of-band imbedded standard Intelligent Platform Management Interface (IPMI) system to manage hot-swap module replacement and hardware-software failover. An additional goal is to achieve a much higher degree of interoperability of both lab and industry designed hardware-software products than past generations of standards. This presentation will describe status of the hardware-software standards extension plans; technology advantages for machine controls and data acquisition systems; and examples of collaborative efforts to help develop an industry base of generic ATCA and MicroTCA products in an open-source environment.
	Slides WEIB03 [3.905 MB]

WEPC003	Low-Beta Empirical Models used in Online Modeling and High Level Applications	space-charge, cavity, solenoid, simulation	2001
	Y.-C. Chao, G. Goh TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
	Using empirically models for elements generated by simulations codes such as Astra in low-beta beamline to provide efficient and more accurate models for machine diagnostic and tuning is discussed. Experience of such application in the framework of XAL may also be presented.

WEPC007	Large Energy Acceptance Dogleg for the European XFEL Injector	sextupole, focusing, quadrupole, linac	2013
	N. Golubeva, V. Balandin, W. Decking DESY, Hamburg, Germany
	The option to install two injectors is foreseen at the European XFEL Facility. The injectors will be located on top of each other in the same building, both with the offset of 2.75 m with respect to the main linac axis. The translation system (dogleg) from the injector axis to the main linac axis has to fulfill very tight requirements of the chromatic properties, because the energy chirp required for the downstream bunch length compression in magnetic chicanes will be created upstream in the injector linac. In this paper we present such an large energy acceptance dogleg and discuss the optical symmetries which form the basis of its design.

WEPC034	High-level Application Programs for the TPS Commissioning and Operation at NSRRC	quadrupole, storage-ring, target, EPICS	2079
	F.H. Tseng, H.-P. Chang, C.C. Chiang NSRRC, Hsinchu, Taiwan
	For the Taiwan Photon Source (TPS) commissioning and operation we have developed more MATLAB-based application programs and tested them on the Taiwan Light Source (TLS). These additional applications built with the MATLAB Middle Layer (MML) include beta function measurement, dispersion function measurement, chromaticity measurement, chromaticity correction, and tune control. In this paper, we will illustrate what algorithms we use in these applications and show the test results. Especially, in order to get the first beam in the TPS commissioning, we adopt the RESOLVE algorithm for the beam steering and it has been built successfully in UNIX-like systems such as Mac OSX and different Linux versions. It can provide us some exercises of error finding and correction before the TPS commissioning in 2013.

WEPC091	Studies with a Particle Tracking Code for the SIS100 Resonant Extraction System	extraction, quadrupole, synchrotron, feedback	2220
	M.M. Kirk, G. Franchetti, H. Klingbeil, P. Moritz, N. Pyka, H. Ramakers, P.J. Spiller, H. Welker GSI, Darmstadt, Germany
	Several issues concerning the envisaged SIS100 resonant extraction at GSI can be resolved with a simulation-lead approach for which a particle tracking code was developed. Applications to date have included: design and testing of data supply algorithms for the accelerator control system; requirements analysis for the power converter ripple in the quadrupoles forming the doublet focusing; and verification of the RF Knock-Out exciter's performance.

WEPC115	A Global Optimization Approach Based on Symbolic Presentation of a Beam Propagator	booster, focusing, quadrupole, induction	2280
	S.N. Andrianov, A.N. Ivanov, M. Kosovtsov, E.A. Podzyvalov St. Petersburg State University, St. Petersburg, Russia
	It is known that modern systems of beam lines consist of huge control elements even in the case of small machines. The problem of the beam line design leads us to formulate this problem as a global optimization ones. This approach allows us defining a family of appropriate solutions. On the next steps a researcher should narrow this optimal solutions set using additional methods and concepts. The symbolic presentation of necessary information plays leading role on all steps of the suggested approach. The corresponding implementation presented in the paper allows us to find the optimal sets in parameters spaces in a proper way. The corresponding applied software was used for solution of some practical probems. The described ideology implies to use distributed and parallel technologies for necessary computing and will be integrated in the Virtual Accelerator concept.

WEPC116	A Matrix Presentation for a Beam Propagator including Particles Spin	collider, storage-ring, heavy-ion, scattering	2283
	M. Kosovtsov, S.N. Andrianov, A.N. Ivanov St. Petersburg State University, St. Petersburg, Russia
	Particles beam dynamics in magnetic and electrical fields with spin is discussed. This approach provides a constructive method of matrix presentation derivation for a beam propagator in magnetic and electrical fields. The beam propagator is evaluated in according to the well-known Lie algebraic tools. But in contrast to traditional approaches matrix presentation for Lie propagators bases on two-indexes matrices. This approach permit to apply all of matrix algebra opportunities and advantages in contrast with the tenzor presentation based on multi-indexes description. The necessary computation can be realized in symbolic (using computer algebra codes as Mathematica, Maple, Maxima and so on). The corresponding symbolic objects itself can be stored in special databases and used then in numerical computing. Parallel and distributed conception is well acceptable with the suggested matrix formalism. Some symbolic and numerical results are discussed for problems of long term evolution of particles with spin.

WEPC117	Symmetry Based Design for Beam Lines*	quadrupole, target, insertion, beam-transport	2286
	S.N. Andrianov, A.N. Ivanov, M. Kosovtsov St. Petersburg State University, St. Petersburg, Russia
	Usually, the beam line design problems are solved using numerical optimization methods (for example, in the frame of so called global optimization paradigm). But this approach demonstrates enough effectiveness only after sufficient reduction of a control parameters set. In this paper we present the symmetry design concept based on symbolic computations for the corresponding beam line propagator. The combination of symbolic algebra codes (such as Maple, Mathematica, Maxima and so on) with the matrix formalism for Lie algebraic tools enables us to carry out the entire theoretical and computing processes for design of the beam line under study. For this purpose some of necessary physical requirements are formulated in the terms of the corresponding symmetry conditions. The suggested approach can be realized in both exact and approximate forms of the symmetry terms. The found conditions can sufficiently reduce the number of control parameters for the next optimization step.

WEPC120	Status of JMAD, the JAVA-API for MADX	optics, status, lattice, feedback	2292
	K. Fuchsberger, X. Buffat, Y.I. Levinsen, G.J. Müller CERN, Geneva, Switzerland
	MADX (Methodical Accelerator Design) is the de-facto standard software for modeling accelerator lattices at CERN. This feature-rich software package is implemented and still maintained in the programming languages C and FORTRAN. Nevertheless the controls environment of modern accelerators at CERN, e.g., of the LHC, is dominated by JAVA applications. A lot of these applications, for example, for lattice measurement and fitting, require a close interaction with the numerical models, which are all defined by the use of the proprietary MADX scripting language. To close this gap an API to MADX for the JAVA programming language (JMAD) was developed. JMAD was first presented to the public about one year ago. In the meantime, a number of improvements were done, and additional MADX features (e.g., tracking) were made available for JAVA applications. Additionally, the graphical user interface was improved, and the first release as open source software is in reach. This paper describes the current status and some new features of the project, as well as some usage examples.

WEPC121	XML Constructs for Developing Dynamics Applications or Towards a Universal Representation of Particle Accelerators in XML	EPICS, extraction, lattice, diagnostics	2295
	J.T.M. Chrin, R.A. Krempaska, H. Lutz, G. Prekas PSI, Villigen, Switzerland T.A. Pelaia ORNL, Oak Ridge, Tennessee, USA
	A recognized practice within the development of high-level beam dynamics applications is to separate data parameters destined for the configuration of the application from the programming language domain. The contemporary approach is to generate input files that provide the configuration parameters in a structured data format specified by the Extensible Markup Language (XML), enhancing flexibility and simplifying code maintenance. Furthermore, a careful choice of syntactic constructs, i.e. structured elements, attributes, etc., that map well to the various accelerator components, provides a basis for portability of applications. This has been exemplified by the XAL software package which initiated an XML description of the Standard Machine Format (SMF) accelerator object model. We have since adopted XML-SMF to provide an XML representation of both the Swiss Light Source (SLS) and the SwissFEL Injector Test Facility. We demonstrate how such XML constructs allow us to deploy the same orbit display application at both facilities. Our experience leads us to advocate a Universal Machine Format (UMF) that encompasses an all-inclusive XML schema for the management of accelerator information.
	Poster WEPC121 [0.313 MB]

WEPC134	Unified Accelerator Modeling Using the Bmad Software Library	simulation, lattice, photon, linac	2310
	D. Sagan, I.V. Bazarov, J.Y. Chee, J.A. Crittenden, G. Dugan, K. Finkelstein, G.H. Hoffstaetter, C.E. Mayes, S. Milashuk, D. L. Rubin, J.P. Shanks CLASSE, Ithaca, New York, USA R. Cope CSU, Fort Collins, Colorado, USA
	Funding: Work supported by the National Science Foundation and by the US Department of Energy under contract numbers PHY-0734867 and DE-FC02-08ER41538. The Bmad software library has proved to be a useful tool for accelerator simulations owing to its modular, object-oriented design. It is now used in a number of design, simulation and control programs at the Cornell Laboratory for Accelerator-based Sciences and Education. Work is ongoing to expand Bmad in a number of directions. One aim is tohave a complete framework in order to simulate Cornell's Energy Recovery Linac from Gun cathode (including space-charge) to photon generation to photon tracking through to the x-ray experimental end stations. Other work includes synchrotron radiation tracking including reflections from the vacuum chamber walls which is useful for electron cloud investigations, spin tracking, beam break-up instability, intra-beam scattering, etc. This paper will discuss the current state of the Bmad software along with the long-term goals.

WEPC142	High Performance Web Applications for Particle Accelerator Control Systems	luminosity, collider, optics, diagnostics	2322
	G. Mazzitelli, C. Bisegni, P. Ciuffetti, G. Di Pirro, A. Stecchi INFN/LNF, Frascati (Roma), Italy S. Calabrò, L.G. Foggetta IN2P3-CNRS, Orsay, France L. Catani, F. Zani INFN-Roma II, Roma, Italy
	The integration of web technologies and applications has been one of the major trends for the development of new services for control systems of particle accelerators and large experimental apparatuses. Nowadays, high performance web technologies exhibit some features that would allow their deeper integration in a control system and their employment in developing control system's core components. In this paper we discuss the results of preliminary investigations of a new paradigm for a particle accelerator control system and associated machine data acquisition system based on a synergic combination of network distributed cache memory and a non-relational key/value database. Storage speed, network memory data retrieve throughput and database queries execution, as well as scalability and redundancy of the systems, are presented and critically reviewed.
	Poster WEPC142 [8.902 MB]

WEPC143	First Operation of the SACLA Control System in SPring-8	electron, laser, monitoring, status	2325
	R. Tanaka, Y. Furukawa, T. Hirono, M. Ishii, M. Kago, A. Kiyomichi, T. Masuda, T. Matsumoto, T. Matsushita, T. Ohata, C. Saji, T. Sugimoto, M. Yamaga, A. Yamashita JASRI/SPring-8, Hyogo-ken, Japan T. Fukui, T. Hatsui, N. Hosoda, T. Ohshima, T. Otake, Y. Otake, H. Takebe RIKEN/SPring-8, Hyogo, Japan H. Maesaka RIKEN Spring-8 Harima, Hyogo, Japan
	The control system design of the X-ray free electron laser facility (SACLA) in SPring-8 has started in 2006. Now, the facility has completed to start beam commissioning in February 2011. The electron beams were successfully accelerated up to 8 GeV and the first SASE X-ray was observed. The control system adopts the 3-tier standard model by using MADOCA framework developed in SPring-8. The upper control layer consists of Linux PCs for operator consoles, Sybase RDBMS for data logging and FC-based NAS for NFS. The lower layer consists of VMEbus systems with off-the-shelf I/O boards and specially developed boards for RF waveform processing with high precision. Solaris OS is adopted to operate VMEbus CPU. The PLC is used for slow control and connected to the VME systems via FL-net. The Device-net is adopted for frontend device control to reduce the number of signal cables. Some of VMEbus systems have a beam-synchronized data-taking system to meet 60Hz electron beam operation for the beam tuning diagnostics. The accelerator control system has gateways not only to monitor device status but also control the tuning points of the facility utility system, especially cooling water.

WEPC145	Progress in Developing a PLC Control System for the PKUNIFTY	pick-up, rfq, cavity, neutron	2331
	J. Zhao, J.E. Chen, Z.Y. Guo, Y.R. Lu, S.X. Peng, Q.F. Zhou PKU/IHIP, Beijing, People's Republic of China
	A compact remote PLC control system has been developed for the PKUNIFTY (Peking University Neutron Imaging FaciliTY). That facility is based on a 2 MeV deuteron RFQ accelerator. The PLC control system has been successfully used for the injector including ECR ion source and LEBT, and it worked reliably last year. Now the control of RFQ cavity, HEBT and Be target has been completed and tested. The interlock system has been enhanced. A low level RF control system, including the auto frequency control (AFC) and auto gain control (AGC) circuits, has been designed for the RFQ’s RF power system. Those circuits will work as a lower controller of the PLC control system. The main running parameters can be controlled by setting any desired range of values on the HMI. Test results of hardware and software are presented.

WEPC146	Design and Implementation of Distributed Control System for PEFP 100-MeV Proton Accelerator*	EPICS, proton, monitoring, vacuum	2334
	Y.-G. Song, Y.-S. Cho, J.-H. Jang, H.-J. Kwon KAERI, Daejon, Republic of Korea
	Funding: This work is supported by the Ministry of Education, Science and Technology of the Korean Government. The Proton Engineering Frontier Project (PEFP) has been developing the control system for 100-MeV proton accelerator. The PEFP control system should be designed to fit control conditions based on networked and distributed real-time system composed of several sub-systems such as machine control, diagnostic control, timing, and interlock. In order to implement the distributed control system, the Experimental Physics and Industrial Control System (EPICS) has been chosen as the middleware of PEFP control system. The EPICS software provides a distributed architecture that supports a wide range of solution such as independent programming tool, operator interface tool, database and web-based archiving tools. In this paper, we will present the details of the design and implementation issues of the PEFP control system.

WEPC152	Android Based Mobile Monitoring System for EPICS Networks: Vacuum System Application*	EPICS, monitoring, vacuum, ion-source	2337
	I. Badillo, I. Arredondo, M. Eguiraun, J. Feuchtwanger, G. Harper ESS-Bilbao, Zamudio, Spain J. Jugo University of the Basque Country, Faculty of Science and Technology, Bilbao, Spain
	Funding: The present work is supported by the Basque Government and Spanish Ministry of Science and Innovation. When cabling is not really needed for performance reasons, wireless monitoring is a good choice for large scientific facilities like particle accelerators, due to the quick implementation. There are several wireless flavors: ZigBee, WiFi etc. depending on requirements of specific application. In this work, a wireless monitoring system for EPICS based on an Android device is presented. The task is to monitor the vacuum control system of ISHN project at ESSBilbao, where control system variables are acquired over the network and published in a mobile device. This allows the operator to check process variables everywhere the signal spreads. In this approach, a Python based server is continuously getting EPICS variables via CA protocol and sending them through a WiFi network using ICE middleware, a toolkit oriented to develop distributed applications. Finally, the mobile device reads and shows the data to the operator. The security of the communication is ensured by a limited WiFi signal spread, following the same idea as in NFC for larger distances. With this approach, local monitoring and control applications are easily implemented, useful in starting up and maintenance stages.

WEPC153	ISHN Ion Source Control System Overview and Future Developments	power-supply, ion, ion-source, plasma	2340
	M. Eguiraun, I. Arredondo, J. Feuchtwanger, G. Harper, M. del Campo ESS-Bilbao, Zamudio, Spain J. Jugo University of the Basque Country, Faculty of Science and Technology, Bilbao, Spain S. Varnasseri ESS Bilbao, Derio, Spain
	Funding: The present work is supported by the Basque Government and Spanish Ministry of Science and Innovation. ISHN project consist on a Penning ion source which will deliver up to 65 mA of H⁻ beam pulsed at 50 Hz with a diagnostics vessel for beam testing purposes. The present work summarizes the control system of this research facility, and presents its future developments. ISHN consist of several power supplies for plasma generation and beam extraction, including auxiliary equipment and several diagnostics elements. The control system implemented with LabVIEW is based on PXI systems from National Instruments, using two PXI chassis connected through a dedicated fiber optic link between HV platform and ground. Source operation is managed by a real time processor, while additional tasks are performed by means of an FPGA. In addition, the control system uses a MySQL database for data logging, by means of a LabVIEW application connected to such DB. The integration of EPICS into the control system by deploying a Channel Access Server is the ongoing work, several alternatives are being tested. Finally, a high resolution synchronization system has been designed, for generating timing for triggers of plasma generation and extraction as well as data acquisition for beam diagnostics.

WEPC154	EPICS HyperArchiver: initial tests at ESSBilbao	EPICS, insertion, ion-source, ion	2343
	M. del Campo ESS-Bilbao, Zamudio, Spain M.G. Giacchini, L.G. Giovannini INFN/LNL, Legnaro (PD), Italy J. Jugo University of the Basque Country, Faculty of Science and Technology, Bilbao, Spain
	Funding: The present work is supported by the Basque Government and Spanish Ministry of Science and Innovation. The aim of this work is to present the results obtained after different tests performed regarding data storage for an Ion Source, by means of an EPICS control system at ESS-Bilbao (Spain). As a first approach, data was recorded on a MySQL database, using a traditional EPICS RDB Channel Archiver instance, maintained at ORNL SNS (USA). Nevertheless, initial results shown the need of an evolution towards a high performance scalable database. Therefore, current tests are focused on the customization and usage of a HyperArchiver instance, developed at INFN/LNL (Italy), which uses Hypertable as its main database. Hypertable is a distributed, high performance non relational database, released under GNU licence and focused on data-intensive tasks. At ESS Bilbao, a slightly modified version of the HyperArchiver was used, due to the necessity of an improvement on the management of array PVs. Regarding data retrieval and visualization, a python GUI developed at ESS-Bilbao was used, in opposition to the traditional CSS data browser, trying to make data retrieval as fast and simple as possible. Hypertable is presented as a high performance alternative to MySQL for any EPICS control system.

WEPC155	Fast Acquisition Multipurpose Controller with EPICS Integration and Data Logging	EPICS, status, LLRF	2346
	I. Arredondo, D. Belver, P. Echevarria, H. Hassanzadegan, M. del Campo ESS-Bilbao, Zamudio, Spain V. Etxebarria, J. Jugo University of the Basque Country, Faculty of Science and Technology, Bilbao, Spain N. Garmendia, L. Muguira ESS Bilbao, Bilbao, Spain
	Funding: Funding Agency The present work is supported by the Basque Government and Spanish Ministry of Science and Innovation. This work introduces a fast acquisition multipurpose controller (MC), based on a XML configuration with EPICS integration and Data Logging. The main hardware is an FPGA based board, connected to a Host PC. This Host computer acts as the local controller and implements an IOC, integrating the device into an EPICS network. Java has been used as the main programming language in order to make the device fit the desired application. The whole process includes the use of different technologies: JNA to handle FPGA API, JavaIOC to integrate EPICS and XML w3c DOM classes to configure each particular application. Furthermore, a MySQL database is used for data storage, together with the deployment of an EPICS ArchiveEngine instance, offering the possibility to record data from both, the ArchiveEngine and a specifically designed Java library. The developed Java specific tools include different methods: FPGA management, creation and use of EPICS server, mathematical data processing, Archive Engine's MySQL database connection and creation/initialization of the application structure by means of an XML file. This MC has been used to implement a BPM and an LLRF applications for ESS-Bilbao.

WEPC156	Virtual Power Supply Control Environment for the TPS Project	power-supply, EPICS, quadrupole, storage-ring	2349

Paper

Title

Other Keywords

Page

MOYAA01

The LHC from Commissioning to Operation

injection, luminosity, optics, ion

11

M. Lamont
CERN, Geneva, Switzerland

In 2011 the LHC moves from commissioning into the physics production phase with the aim of accumulating 1fb-1 by the end of 2011. The progress from commissioning to operation is described. Emphasis is put on the beam performance, but also on the performance of the different hardware systems. The role of collimation and machine protection is discussed, in view of the very high stored beam and magnet energy. Comment: Other invited presentations in this conference will cover the experience with beam instrumentation and the upgrade programmes.

Slides MOYAA01 [7.410 MB]

MOPC001

Linac Waveguide Upgrade at the Australian Synchrotron Light Source

klystron, linac, booster, synchrotron

62

R.T. Dowd, G. LeBlanc, K. Zingre
ASCo, Clayton, Victoria, Australia

The Australian Synchrotron Light Source (ASLS) uses a 100 MeV linac as the start of the acceleration chain for the injector. The two main accelerating structures of linac are normally fed by independent pulsed klystrons. A recent upgrade to the waveguide system has allowed for a single klystron to power both accelerating structures. While this operation mode delivers a reduced total beam energy, the operation of only a single klystron results in less wear and enhanced robustness against klystron breakdown. Commissioning results of single klystron operation of the linac are shown and future benefits are detailed.

MOPC016

Development of a New RF Accelerating Cavity for J-PARC Ring Accelerator

cavity, simulation, impedance, ion

98

Y. Morita, T. Kageyama
KEK, Ibaraki, Japan
J. Kameda
ICRR, Chiba, Japan
S. Yamashita
ICEPP, Tokyo, Japan

Funding: Japan Society for the Promotion of Science (JSPS)
To enhance the beam power delivered by the J-PARC* ring accelerators, upgrading the accelerating cavities is indispensable. In particular, long term stable operation of the present cavities for the RCS** is one of the important issues. Currently, the cavities are loaded with FINEMET*** cores cooled by water, where every core is coated with glass cloth and epoxy resin for waterproof. However, it was reported that some of the cores were damaged by thermal stress. We are developing a new cavity loaded with multi ring core modules. Each core module consists of three ring cores concentrically arranged and sandwiched between two glass epoxy plates with flow channels grooved. The ring cores without waterproof coating are cooled by the turbulent flow of a chemically inert liquid (Fluorinert), since FINEMET is subject to corrosion in water. We have designed and built a high power prototype cavity loaded with a single core module, then carried out low level measurement and high power test. Finally, the cavity has been stably operated up to an average power loss of 10 kW per core module, which is 1.7 times higher than that for the present RCS cavity.
*Japan Proton Accelerator Research Complex
**Rapid-Cycling Synchrotron
***FINEMET is an iron-based magnetic alloy produced by Hitachi Metals, Ltd..

MOPC030

The C-band Traveling-wave Accelerating Structure for Compact XFEL at SINAP*

linac, vacuum, impedance, status

133

W. Fang, Q. Gu, Z.T. Zhao
SINAP, Shanghai, People's Republic of China
D.C. Tong
TUB, Beijing, People's Republic of China

The R&D of C-band accelerating structure has been launched two years ago at Shanghai Institute of Applied Physics, it will be used for the future compact hard X-ray FEL. The 1st C-band traveling-wave accelerating structure is ready for the high power test now. This structure is the preliminary model for the research of the technology of microwave test and tuning, arts and crafts and high power test. This paper presents the process of fabrication, cold test and tuning results.

MOPC032

Improvement of the RF System for the PEFP 100 MeV Proton Linac*

linac, LLRF, proton, EPICS

139

K.T. Seol, Y.-S. Cho, H.S. Kim, H.-J. Kwon, Y.-G. Song
KAERI, Daejon, Republic of Korea

Funding: This work is supported by the Ministry of Education, Science and Technology of the Korean Government.
The 100 MeV proton linear accelerator of the Proton Engineering Frontier Project (PEFP) has been developed and will be installed in Gyeong-ju site. The 20 MeV accelerator operated in Korea Atomic Energy Research Institute (KAERI) site will be also moved and reinstalled. The LLRF control systems for the 20 MeV accelerator were improved and have been operated within the stability of ±1% in RF amplitude and ±1 degree in RF phase. 7 sets of the extra LLRF control system will be installed with a RF reference system for the 100 MeV accelerator. Waveguide layout was also improved to install HPRF systems for the 100 MeV accelerator. Some of the HPRF components including klystrons, circulators, and RF windows are under purchase. The waveguide sections penetrating into the tunnel, which are fixed in a concrete floor with the bending structure for radiation shielding, were fabricated into a piece of waveguide to prevent the moisture and any foreign debris inside the concrete block. The details of the RF system improvement are presented.

MOPC037

Engineering Design and Fabrication of X-band Damped Detuned Structure for the CLIC Study

damping, vacuum, alignment, wakefield

154

V. Soldatov, D. Gudkov, A. Samoshkin
JINR, Dubna, Moscow Region, Russia
S. Atieh, A. D'Elia, A. Grudiev, G. Riddone
CERN, Geneva, Switzerland
R.M. Jones, V.F. Khan
UMAN, Manchester, United Kingdom

A Damped Detuned Structure (DDS), known as CLIC_DDS_A*, has been designed for the Compact Linear Collider (CLIC) study, and is presently under fabrication. The wakefield in DDS structures is damped using a combination of detuning the frequencies of beam-excited higher order modes and by light damping, through slot-coupled manifolds. The broad principles of the design are similar to that used in the NLC/GLC**. This serves as an alternative to the present baseline CLIC design which relies on heavy damping. CLIC_DDS_A is conceived to be tested for its capacity to sustain high gradients at CERN. This structure operates with a 120 degrees phase advance per cell. We report on engineering design and fabrication details of the structure consisting of 24 regular cells plus 2 matching cells at both ends, all diffusion bonded together. This design takes into account practical mechanical engineering issues and is the result of several optimizations since the earlier CLIC_DDS designs.
* V. F. Khan et al., “Recent Progress on a Manifold Damped and Detuned Structure for CLIC”, Proc. of IPAC10, WEPE032, p. 3425 (2010).
** R.M. Jones et al., Phys. Rev. STAB 9, 102001 (2006).

MOPC042

RF and Accelerating Structure of 12 MeV UPC Race-track Microtron

linac, vacuum, coupling, microtron

169

Yu.A. Kubyshin, X. Gonzalez Arriola
UPC, Barcelona, Spain
D. Carrillo, L. García-Tabarés, F. Toral
CIEMAT, Madrid, Spain
S.J. Mathot
CERN, Geneva, Switzerland
G. Montoro
EPSC, Castelldefels, Spain
V.I. Shvedunov
MSU, Moscow, Russia

We describe the design and technical characteristics of a C-band SW accelerating structure of a 12 MeV race-track microtron, which is under construction at the Technical University of Catalonia, and its RF system with a 5712 MHz magnetron as a source. Results of cold tests of the accelerating structure, before and after the brazing, and of high-power tests of the RF system at a special stand are reported. The main features of the magnetron frequency stabilization subsystem are also outlined.

MOPC049

Bead-pull Test Bench for Studying Accelerating Structures at RHUL

cavity, rfq, quadrupole, resonance

187

S. Molloy
ESS, Lund, Sweden
R. Ainsworth, G.E. Boorman
Royal Holloway, University of London, Surrey, United Kingdom
C. Gabor
STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
A. Garbayo
AVS, Eibar, Gipuzkoa, Spain
A.P. Letchford
STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
A. Lyapin
JAI, Egham, Surrey, United Kingdom
P. Savage
Imperial College of Science and Technology, Department of Physics, London, United Kingdom

A bead-pull test stand has been constructed at Royal Holloway, University of London (RHUL) with the ability to provide electric field profile measurements along five degrees of freedom using the perturbation method. In this paper, we present example measurements using the test bench which include a field flatness profile of a 324MHz four vane Radio Frequency Quadrupole (RFQ) model designed as part of the Front End Test Stand (FETS) development at Rutherford Appleton Laboratory (RAL). Mechanical and operational details of the apparatus will also be described, as well as future plans for the development and usage of this facility.

MOPC062

EMMA RF Comissioning

cavity, LLRF, acceleration, beam-loading

226

A.J. Moss, R.K. Buckley, P.A. McIntosh, A.E. Wheelhouse
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom

EMMA (Electron Model for Many Applications), the world’s first Non-Scaling Fixed Field Alternating Gradient (NS-FFAG) accelerator is presently in operation at Daresbury Laboratory. The LLRF system is required to synchronize with ALICE (Accelerators and Lasers in Combined Experiments) its injector, which operates at 1.3GHz, and to produce an offset frequency of (+1.5 MHz to -4 MHz) to probe the longitudinal beam dynamics and to also maintain the phase and amplitude of the 19 copper RF cavities of the EMMA machine. The design, commissioning and results of the EMMA RF system is presented.

MOPC083

Structural Mechanics of Superconducting CH Cavities

cavity, simulation, linac, resonance

268

M. Amberg, K. Aulenbacher
HIM, Mainz, Germany
W.A. Barth, S. Mickat
GSI, Darmstadt, Germany
M. Busch, F.D. Dziuba, H. Podlech, U. Ratzinger
IAP, Frankfurt am Main, Germany

The superconducting CH-structure (Crossbar-H-mode) is a multi-cell drift tube cavity for the low and medium energy range operated in the H21-mode, which has been developed at the Institute for Applied Physics (IAP) of Frankfurt University. With respect to different high power applications two types of superconducting CH-structures (f = 325 MHz, β = 0.16, seven cells and f = 217 MHz, β = 0.059, 15 cells) are presently under construction and accordingly under development. The structural mechanical simulation is a very important aspect of the cavity design. Furthermore, several simulations with ANSYS Workbench have been performed to predict the deformation of the cavity walls due to the cavity cool-down, pressure effects and mechanical vibrations. To readjust the fast frequency changes in consequence of the cavity shape deformation, a new concept for the dynamic frequency tuning has been investigated, including a novel type of bellow-tuner.

MOPC088

Bead-pull Measurement using Phase-Shift Technique in Multi-cell Elliptical Cavity

cavity, linac, vacuum, monitoring

280

S. Ghosh, A. Mandal, S. Seth, S.S. Som
DAE/VECC, Calcutta, India

The project on the development of high-beta multi-cell elliptical shape superconducting rf linac cavity at around 704 MHz has been funded at VECC, Kolkata, India. A full-scale copper prototype cavity has been designed and fabricated. There are 5 distinct modes exist in the cavity and the accelerating mode is pi-mode in which each cell operates at same frequency with phase difference of 180 degrees between two neighboring cells. A fully automated bead-pull measurement setup has been developed for analyzing these modes and field profile distribution at different modes in such type of linac cavity. A special measurement method inside the cavity using phase-shift technique is proposed in this paper, which describes the development of mechanical setup comprising pulleys and stepper motor–gear arrangement, PC-based control system for precise movement of bead using stepper motor, measurement using VNA, development of software for data acquisition & automation and measurement results for the 5-cell copper prototype cavity.

MOPC090

Tuner Performance in the S1-global Cryomodule

cavity, cryomodule, high-voltage, coupling

286

R. Paparella, A. Bosotti, C. Pagani
INFN/LASA, Segrate (MI), Italy
C. Albrecht, K. Jensch, L. Lilje
DESY, Hamburg, Germany
S. Barbanotti, Y.M. Pischalnikov, W. Schappert
Fermilab, Batavia, USA
H. Hayano, E. Kako, S. Noguchi, N. Ohuchi, Y. Yamamoto
KEK, Ibaraki, Japan

S1-Global is a collaborative effort of INFN, DESY, FNAL, SLAC and KEK, in the framework of the ILC global collaboration. For this project two cryomodules, 6 meter long and hosting four SC cavities each, were realized and successfully cold tested at KEK-STF. Three different cavity tuning systems, provided with fast tuning capability through piezoelectric actuators (piezo), were installed, and fully characterized in static and dynamic operation: Blade Tuner from INFN/FNAL, Saclay Tuner from DESY, Slide Jack Tuner from KEK. Finally, Lorenz Force Detuning (LFD) active compensation has been successfully achieved during high power cavity tests in pulsed RF regime, where active control of the LFD disturbance up to Hz-level residual detuning has been achieved with each type of tuning system up to the maximum gradient of each cavity. The installation procedures, together with the relevant results and their analyses are summarized in the paper.

MOPC093

Novel Field Emission Scanner for Surface Study of Niobium SRF Cavity

cavity, SRF, electron, site

295

S. Kato, M. Nishiwaki, T. Noguchi
KEK, Ibaraki, Japan
V. Chouhan
GUAS, Kanagawa, Japan
P.V. Tyagi
Sokendai, Ibaraki, Japan

It is mandatory to investigate field emission on Nb SRF cavity systematically since strong field emission often limits the cavity performance. The field emission strength and the number of emission sites strongly depend on Nb surface properties which are determined by its surface treatment and handling. Field emission scanner (FES) developed allows us to measure a distribution of the field emitting sites over a sample surface at a given field strength along with its FE-SEM observation and energy dispersive x-ray analysis. FES consists of an anode needle driven by precise 3D stepping motors and an eucentric sample stage. The compact scanner was installed into the space between the object lens and the SEM sample holder. In addition, this system was newly equipped with a sample load-lock system for existing UHV suitcases. Therefore a sample coupon to be observed is hardly exposed to contaminants and dust particles during the transportation. In-situ heating of a sample coupon can be done during an experiment to simulate a baking process of a SRF cavity. This article describes development of the field emission scanner and its preliminary results of the application to niobium samples.

MOPC097

LLRF Control System for PKU DC-SC Photocathode Injector

cavity, LLRF, superconducting-cavity, SRF

304

H. Zhang, Y.M. Li, K.X. Liu, F. Wang, B.C. Zhang
PKU/IHIP, Beijing, People's Republic of China

A 1.3 GHz 3.5 Cell LG niobium cavity is installed for the new PKU DC-SC injector as its accelerating cavity with working temperature is 2K. High amplitude and phase stability is required for the updated SRF photocathode injector. This paper describes the design of Low Level RF control system based on FPGA, including hardware and software,and the communication function is realized by Tri-State Ethernet. The system should be operated on the precision with the amplitude of ±0.1% and phase stability of ±0.1°.

MOPC108

Cornell SRF New Materials Program*

cavity, niobium, SRF, monitoring

328

S. Posen, M. Liepe, Y. Xie
CLASSE, Ithaca, New York, USA

Funding: Work supported by NSF Career award PHY-0841213, DOE award ER41628, and the Alfred P. Sloan Foundation
The SRF group at Cornell has recently pioneered an extensive program to investigate alternative materials for superconducting cavities. We have developed facilities to fabricate Nb3Sn, a superconductor which will theoretically be able to reach more than twice the maximum accelerating field of Nb in a cavity under the same operating conditions. In addition, with the critical temperature of Nb3Sn being twice that of Nb, Nb3Sn would allow operation of SRF cavities with a much higher cryogenic efficiency. We have also manufactured two TE cavities that measure the RF properties of small, flat samples, ideal for material fabrication methods in development. This paper presents an overview of the materials research program. First results from tests of Nb3Sn samples are presented.

MOPC118

Effects of the Thickness of Niobium Surface Oxide Layers on Field Emission*

cavity, SRF, niobium, HOM

355

A.T. Wu, S. Jin, J.D. Mammosser, R.A. Rimmer
JLAB, Newport News, Virginia, USA
X.Y. Lu, K. Zhao
PKU/IHIP, Beijing, People's Republic of China

Funding: The U.S. Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce this manuscript for U.S. Government purposes.
Field emission on the inner surfaces of niobium superconducting radio frequency cavities is still one of the major obstacles for reaching high accelerating gradients for SRF community. Our previous experimental results* seemed to imply that the threshold of field emission was related to the thickness of Nb surface oxide layers. In this contribution, a more detailed study on the influences of the surface oxide layers on the field emission on Nb surfaces will be reported. By anodization technique, the thickness of the surface pentoxide layer was artificially fabricated from 3 nm up to 460 nm. A home-made scanning field emission microscope was employed to perform the scans on the surfaces. Emitters were characterized using a scanning electron microscope together with an energy dispersive x-ray analyzer. The SFEM experimental results were analyzed in terms of surface morphology and oxide thickness of Nb samples and chemical composition and geographic shape of the emitters. A model based on the classic electromagnetic theory was developed trying to understand the experimental results. Possibly implications for Nb SRF cavity applications from this study will be discussed.
* A.T. Wu et al., Proc. of IPAC 2010, Kyoto, Japan, WEPEC081, p. 3067 (2010).
Authored by The Southeastern Universities Research Association, Inc. under U.S. DOE Contract No. DE-AC05-84ER40150.

MOPC135

IFMIF-EVEDA RF Power System

power-supply, linac, LLRF, cavity

394

D. Regidor, A. Arriaga, J.C. Calvo, A. Ibarra, I. Kirpitchev, J. Molla, P. Méndez, A. Salom, M. Weber
CIEMAT, Madrid, Spain
M. Abs, B. Nactergal
IBA, Louvain-la-Neuve, Belgium
P.-Y. Beauvais, M. Desmons, A. Mosnier
CEA/DSM/IRFU, France
P. Cara
Fusion for Energy, Garching, Germany
S.J. Ceballos, J. de la Cruz
Greenpower Technologies, Sevilla, Spain
Z. Cvetkovic, Z. Golubicic, C. Mendez
TTI, Santander, Spain
J.M. Forteza, J.M. González, C.R. Isnardi
Indra Sistemas, San Fernando de Henares, Spain
D. Vandeplassche
SCK-CEN, Mol, Belgium

The IFMIF/EVEDA Accelerator Prototype will be a 9 MeV, 125 mA CW deuteron accelerator to validate the technical options for the IFMIF accelerator design. The Radiofrequency Quadrupole (RFQ), buncher cavities and Superconducting Radiofrequency Linac (SRF Linac) require continuous wave RF power at 175 MHz with an accuracy of ±1% in amplitude and ±1° in phase. Also the IFMIF/EVEDA RF Power System has to work under pulsed mode operation (during the accelerator commissioning). The IFMIF/EVEDA RF Power System is composed of 18 RF power generators feeding the eight RFQ couplers (200 kW), the two buncher cavities (10⁵ kW) and the eight superconducting half wave resonators of the SRF Linac (10⁵ kW). The main components of each RF power chain are the Low Level Radio Frequency system (LLRF), three amplification stages and a circulator with its load. For obvious standardization and scale economies reasons, the same topology has been chosen for the 18 RF power chains: all of them use the same main components which can be individually tuned to provide different RF output powers up to 200 kW. The studies and the current design of the IFMIF/EVEDA RF Power System are presented in this contribution.

MOPC137

Medium Power 352 MHz Solid State Pulsed RF Amplifiers for the CERN Linac4 Project

linac, cavity, rf-amplifier, shielding

400

J.C. Broere, J. Marques Balula
CERN, Geneva, Switzerland
Y. Gomez
LPSC, Grenoble Cedex, France
M. Rossi
DBE, Padova, Italy

Economic, modular and highly linear pulsed RF amplifiers have recently been developed to be used for the three Buncher cavities in the CERN Linac4. The amplifiers are water cooled and can provide up to 33 kW pulsed RF power, 1.5 msec pulse length and 50 Hz repetition rate. Furthermore a 60 kWatt unit is under construction to provide the required RF Power for the Debuncher cavity. The concept is based on 1.2 kW RF power modules using the latest 6th generation LDMOS technology. For integration into the CERN control environment the amplifiers have an internal industrial controller, which will provide easy control and extended diagnostic functions. This paper describes the construction, performance, including linearity, phase stability and EMC compliance tests.

MOPC138

Practical Test of the Linac4 RF Power System

klystron, linac, cavity, electron

403

N. Schwerg, O. Brunner
CERN, Geneva, Switzerland

Linac4 is a linear accelerator for negative Hydrogen ions which will replace the old Linac2 as injector for the CERN accelerators. Its higher energy of 160 MeV will increase the beam intensity in the downstream machines. The normal-conducting accelerating structures are housed in a 100 m long tunnel which will be connected to the existing chain of accelerators and can be extended into a new injector chain. The high RF power for the Linac4 accelerating structures will be generated by thirteen 1.3 MW klystrons, previously used for the CERN LEP accelerator, and six new klystrons of 2.8 MW all operating at a frequency of 352.2 MHz. The re-use of existing LEP equipment, space limitations in the installation and tight phase and amplitude constraints pose a number of challenges for the integration of the RF power system. The power distribution scheme features a folded magic-tee feeding the power from a 2.8 MW klystron to two LEP circulators. We present first results from the Linac4 test place, validating the approach and the used components as well as reporting on the klystron re-tuning activities.

MOPC140

Phase and Frequency Locked Magnetrons for SRF Sources

cavity, resonance, shielding, SRF

406

M.L. Neubauer, M.A.C. Cummings, A. Dudas, R.P. Johnson, R. Sah
Muons, Inc, Batavia, USA
A. Moretti, M. Popovic
Fermilab, Batavia, USA

Typically, high power sources for accelerator applications are multi-megawatt microwave tubes that may be combined together to form ultra-high-power localized power stations. The RF power is then distributed to multiple strings of cavities through high power waveguide systems which are problematic in terms of expense, efficiency, and reliability. Magnetrons are the lowest cost microwave source in dollars/kW, and they have the highest efficiency (typically greater than 85%). However, the frequency stability and phase stability of magnetrons are not adequate, when magnetrons are used as power sources for accelerators. Novel variable frequency cavity techniques have been developed which will be utilized to phase and frequency lock magnetrons, allowing their use for either individual cavities, or cavity strings. Ferrite or YIG (Yttrium Iron Garnet) materials will be attached in the regions of high magnetic field of radial-vaned, π−mode structures of a selected ordinary magnetron. The microwave characteristics of several materials have been tested with magnetic fields to control the frequency of the magnetron. These results will be presented and an optimum material chosen.

MOPC145

Recent Progress on the Technical Realization of the Bunch Phase Timing System BuTiS

laser, cavity, diagnostics, status

418

B. Zipfel, P. Moritz
GSI, Darmstadt, Germany

A high precision phase synchronous clock distribution system is mandatory for generating local RF reference signals in an accelerator complex. The dedicated Bunch Timing System (BuTiS) at GSI performs this function. The accuracy of the realized installation under rough ambient conditions is presented. Procedures for calibration and standardization aspects of system modules are pointed out. Hardware as well as software interfaces of the system are described. The interfacing between GPS and BuTiS are explained.

MOPC146

Development of Timing Distribution System with Femto-second Stability

feedback, linac, acceleration, laser

421

T. Naito, K. Ebihara, S. Nozawa, N. Terunuma, J. Urakawa
KEK, Ibaraki, Japan
M. Amemiya
AIST, Tsukuba, Japan

A timing distribution system with femto-second stability has been developed for the RF synchronization of accelerator and the laser synchronization of the pump-probe experiments. The system uses a phase stabilized optical fiber(PSOF) and an active fiber length stabilization. The PSOF has 5 ps/km/degC of the temperature coefficient. The active fiber length stabilization uses the phase detection of the round-trip sinusoidal wave and the fiber stretcher for the compensation of the fiber length. In this paper, we present the test results on a 500 m long signal distribution. The preliminary results of the timing stability are 20 fs at several minutes and 100 fs at four days, respectively.

MOPC147

Timing System for MedAustron Based on Off-The-Shelf MRF Transport Layer

ion, synchrotron, ion-source, light-ion

424

R. Tavcar, J. Dedič, Z. Kroflic, R. Štefanič
Cosylab, Ljubljana, Slovenia
J. Gutleber
CERN, Geneva, Switzerland

MedAustron is a new particle accelerator-based ion beam research and therapy centre under construction in Wiener Neustadt, Austria. The timing system for its synchrotron-based accelerator is being developed in close collaboration with Cosylab. We have usedμResearch Finland (MRF) transfer layer and designed and implemented a generic, reusable high-level logic above transport layer inside the generator and receiver FPGA to fulfill machine specific requirements which exceed MRF's original high-level logic capabilities. The new timing system is suitable for small to mid-size accelerators. Its functionalities include support for virtual accelerators and a rich selection of event response mechanisms. The timing system uses a combination of a real-time link for downstream events and a non-real-time link for upstream messaging and non time-critical communication. This article explains the benefits of building a timing system on a proven, stable timing transport layer and describes the high-level services provided by MedAustron timing system.

MOPC151

Design and Commissioning of a Multi-frequency Digital Low Level RF Control System*

cavity, low-level-rf, linac, superconducting-cavity

433

M. Konrad, U. Bonnes, C. Burandt, J. Conrad, R. Eichhorn, J. Enders, P.N. Nonn, N. Pietralla
TU Darmstadt, Darmstadt, Germany

Funding: Work supported by DFG through CRC 634 and by the BMBF under 06 DA 9024 I.
Triggered by the need to control the superconducting cavities of the S-DALINAC, which have a high loaded quality factor and are thus very susceptible to microphonics, the development of a digital low level RF control system was started. The chosen design proved to be very flexible since other frequencies than the original 3 GHz may be adapted easily: The system converts the RF signal coming from the cavity (e. g. 3 GHz) down to the base band using a hardware I/Q demodulator. The base band signals are digitized by ADCs and fed into a FPGA where the control algorithm is implemented. The resulting signals are I/Q modulated before they are sent back to the cavity. The superconducting cavities are operated with a self-excited loop algorithm whereas a generator-driven algorithm is used for the low Q normal-conducting bunching cavities. A 6 GHz RF front end allows the synchronous operation of a new 2f buncher at the S-DALINAC. Meanwhile, a 325 MHz version has been built to control a pulsed prototype test stand for the p-LINAC at FAIR. We will present the architecture of the RF control system as well as results obtained during operation.

MOPC152

Digital Control System for Solid State Direct Drive™ RF-Linacs

cavity, LLRF, linac, pick-up

436

J. Sirtl, M. Back, T. Kluge
Siemens AG, Erlangen, Germany
H. Schröder
ASTRUM IT GmbH, Erlangen, Germany

The Solid State Direct Drive™ concept for RF linacs has previously been introduced*. Due to the different methodology (i.e. solid state based rather than electron tube based) as compared with conventional RF sources a new control system is required to deliver the required LLRF. To support this new technology a fully digital control system for this new concept has been developed. Progresses in Digital – Analogue Converter technology and FPGA technology allows us to create a digital System which works in the 150 Mhz baseband. The complete functionality was implemented in a Virtex 6 FPGA. Dispensing with the PLL allows an excellent jitter-behaviour. For this job, we use three 12 bit ADCs with a Sampling Rate of 1 GS/s and two 16 bit DACs (1 GS/s). The amplitude of the RF source is controlled by dividing the RF modules mounted on the power combiner** into two groups and controlling the relative phase of each group (in effect mimicking an “out-phasing” amplifier). This allows the modules to be operated at their optimum working point and allows a linear amplitude behaviour.
* O. Heid, T. Hughes, Proc. of IPAC10, THPD002, p. 4278, Kyoto, Japan (2010).
** O. Heid, T. Hughes, Proc. of LINAC10, THPD068, Tsukuba, Japan.

MOPC153

Design and Implementation of Automatic Cavity Resonance Frequency Measurement and Tuning Procedure for FLASH and European XFEL Cryogenic Modules

cavity, klystron, LLRF, resonance

439

V. Ayvazyan, W. Koprek, D. Kostin, G. Kreps
DESY, Hamburg, Germany
Z. Geng
SLAC, Menlo Park, California, USA

The superconducting cavities in FLASH and European XFEL should be tuned to the frequency of 1.3 GHz after cool down and adjusted to initial frequency before warm up by stepper motor tuners. The initial frequency is 300 kHz far from the operating frequency (1.3 GHz) to remove mechanical hysteresis of the tuner. The cavities should be relaxed to initial frequency to avoid a plastically deformation. In framework of digital low level RF and DOOCS control systems we have developed a simple automatic procedure for the remote resonance frequency measurement and simultaneous remote tuning for all cavities which are driven from the single klystron. The basic idea is based on frequency sweeping both for driving klystron and for generation of local oscillator frequency with constant RF frequency from master oscillator. The developed system has been used during FLASH commissioning in spring 2010 and is in use for cavity and cryogenic module test stands for European XFEL at DESY.

MOPC155

Performance of the Micro-TCA Digital Feedback Board for DRFS Test at KEK-STF

cavity, feedback, klystron, LLRF

445

T. Miura, D.A. Arakawa, S. Fukuda, E. Kako, H. Katagiri, T. Matsumoto, S. Michizono, Y. Yano
KEK, Ibaraki, Japan

The test of distributed RF scheme (DRFS) for ILC was carried out at the superconducting RF test facility in KEK (KEK-STF). The LLRF system and two klystron units were installed in the same tunnel as SRF cavities. The vector-sum control for two cavities was done by using the micro-TCA digital feedback board. This board was the same one developed for the compact-ERL at KEK, but the software was changed for pulse operation. The result of the performance will be reported.

MOPC157

Performance of LLRF System at S1-Global in KEK*

cavity, diagnostics, klystron, cryogenics

451

S. Michizono, D.A. Arakawa, S. Fukuda, E. Kako, H. Katagiri, T. Matsumoto, T. Miura, Y. Yano
KEK, Ibaraki, Japan

Vector-sum control was carried out at S1-Global. The rf stabilities of 0.007% in amplitude and 17 mdeg. in phase are obtained. Various diagnostics (such as on-line quench pulse detector, dynamic detuning monitor and so on) is implemented. The IF-mixture system, where 3 intermediate frequencies (IF) are used and the number of ADCs can be reduced, was used as rf waveform monitors. These monitors are used for the performance analysis. Quench phenomena observed at the high-gradient operation are also analyzed from the view point of dynamic change in loaded Q and cavity detuning during rf pulse.

MOPC160

Digital LLRF for IFMIF-EVEDA

cavity, LLRF, rfq, resonance

457

A. Salom, A. Arriaga, J.C. Calvo, I. Kirpitchev, P. Méndez, D. Regidor, M. Weber
CIEMAT, Madrid, Spain
A. Mosnier
CEA/IRFU, Gif-sur-Yvette, France
F. Pérez
CELLS-ALBA Synchrotron, Cerdanyola del Vallès, Spain

The IFMIF-EVEDA project aims to build a prototype accelerator (deuteron, 9MeV, 125mA) to be located at Rokkasho, Japan, for design validation of the IFMIF Accelerator. CIEMAT from Madrid, Spain, is in charge of providing the RF systems for this prototype accelerator. The LLRF will adjust the phase and amplitude of the RF drive and the resonance frequency of the cavities. This paper summarizes its main characteristics and Control System integrated in EPICS. The hardware is based on a commercial FPGA board, an analog front end and a local timing system. Each LLRF system will control and diagnose two RF chains and it will handle the RF fast Interlocks (vacuum, arcs, reflected power and multipacting). A specific LLRF will be developed for the special case of the RFQ cavity, with one Master LLRF and three Slave LLRFs to feed the 8 RF chains of the cavity. The conceptual design and other capabilities of the system like automatic conditioning, frequency tuning for startup and field flatness of the RFQ, etc, will be shown in this paper together with the first low power test results of the LLRF prototype and the performance of the Control System.

MOPC161

Challenges for the Low Level RF Design for ESS

cavity, LLRF, klystron, linac

460

A.J. Johansson
Lund University, Lund, Sweden
R. Zeng
ESS, Lund, Sweden

The European Spallation Source (ESS) is a planned neutron source to be built in Lund, Sweden, which is planned to produce the first neutrons in 2019. It will have an average beam power at the target of 5 MW, an average current along the Linac of 50 mA, and a pulse repetition rate and length of 20 Hz and 2 ms, respectively. The Linac will have around 200 LLRF stations employed to control a variety of RF cavities such as RFQ, DTL, spoke and elliptical superconducting cavities. The challenges on LLRF systems are mainly the high demands on energy efficiency on all parts of the facility, an operational goal of 95% availability of the facility and a comparably short time from start of final design to commissioning. Running with long pulses, high current and spoke cavities also brings new challenges on LLRF design. In this paper we will describe the consequences these challenges have on the LLRF system, and the proposed solutions and development projects that have started in order to reach these demands.

MOPC163

Low-level RF Control System for the Taiwan Photon Source

cavity, LLRF, low-level-rf, SRF

463

M.-S. Yeh
NSRRC, Hsinchu, Taiwan

The low-level RF (LLRF) control system is an essential component of the RF system for Taiwan Photon Source. The LLRF control system will perform various functions including control loops for the cavity gap voltage and the phase feedback, RF system interlock protection and the diagnostics for a machine trip. The LLRF system is manufactured in house using the most recent commercial RF chips. The LLRF system has an analogue architecture similar to that used in the 1.5-GeV Taiwan Light Source (TLS). An overview of the system architecture and its functionality is presented herein.

MOPC164

Upgrade of the ISIS Synchrotron Low Power RF System

cavity, feedback, ion, synchrotron

466

A. Seville, N.E. Farthing, I.S.K. Gardner, R.J. Mathieson, J.W.G. Thomason
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
D.B. Allen
STFC/RAL, Chilton, Didcot, Oxon, United Kingdom

The ISIS synchrotron at the Rutherford Appleton Laboratory in the UK now routinely uses a dual harmonic RF system to accelerate beam currents in excess of 230 uA to run two target stations simultaneously. In order to give more stable control of the phase of the RF voltage at each of the fundamental (1RF) and second harmonic (2RF) cavities, changes have been made to the low power RF (LPRF) control systems. In addition to this a new FPGA based master oscillator has been commissioned for the first time, and further changes using digital technologies to replace other components of the LPRF system are to be investigated. This paper reports on the LPRF hardware commissioning and reliability.

MOPC165

Digital Low Level RF Development at Daresbury Laboratory

cavity, LLRF, linac, beam-loading

469

P.A. Corlett, L. Ma, A.J. Moss
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom

Digital LLRF development using Field Programmable Gate Arrays (FPGAs) is a new activity at Daresbury Laboratory. Using the LLRF4 development board, designed by Larry Doolittle of Lawrence Berkeley National Laboratory, a full featured control system incorporating fast feedback loops and a feed-forward system has been developed for use on the ALICE (Accelerators and Lasers in Combined Experiments) energy recovery linac. Technical details of the system are presented, along with experimental measurements.

MOPC166

Low RF Control Feedback and IQ Vector Modulator Compensation Functions

linac, gun, feedback, coupling

472

M.G. Fedurin, R. Malone, V. Yakimenko
BNL, Upton, Long Island, New York, USA

IQ vector modulator is key element of the gun and linac RF control circuits at Accelerator Test Facility at Brookhaven National Laboratory. IQ modulator calibration procedure was developed to find proper compensation functions in the conversion algorithm to minimize phase-amplitude coupling and setting-reading errors: rms(A_set - A_read )= 0.03dB, rms(Phi_set - Phi_read) = 0.3 deg. Since stabilization of the RF phase and amplitude is become critical for many experiments the slow feedback was developed and applied as well to significantly compensate drifts in RF system.

MOPO001

Interaction Point Feedback Design and Integrated Simulations to Stabilize the CLIC Final Focus*

simulation, feedback, quadrupole, ground-motion

475

G. Balik, L. Brunetti, G. Deleglise, A. Jeremie, L. Pacquet
IN2P3-LAPP, Annecy-le-Vieux, France
A. Badel, B. Caron, R. Le Breton
SYMME, Annecy-le-Vieux, France
A. Latina, J. Pfingstner, D. Schulte, J. Snuverink
CERN, Geneva, Switzerland

The Compact Linear Collider (CLIC) accelerator has strong precision requirements on offset position between the beams. The beam which is sensitive to ground motion needs to be stabilized to unprecedented requirements. Different Beam Based Feedback (BBF) algorithms such as Orbit Feedback (OFB) and Beam-Beam Offset Feedback (BBOF) have been designed. This paper focuses on the BBOF control which could be added to the CLIC baseline. It has been tested for different ground motion models in the presence of noises or disturbances and uses digital linear control with or without an adaptive loop. The simulations demonstrate that it is possible to achieve the required performances and quantify the maximum allowed noise level. This amount of admitted noises and disturbances is given in terms of an equivalent disturbance on the position of the magnet that controls the beam offset. Due to the limited sampling frequency of the process, the control loop is in a very small bandwidth. The study shows that these disturbances have to be lowered by other means in the higher frequency range.

MOPO002

Fast Orbit Correction for the ESRF Storage Ring

power-supply, storage-ring, feedback, diagnostics

478

E. Plouviez, F. Epaud, J.M. Koch, K.B. Scheidt
ESRF, Grenoble, France

Today, at the ESRF, the correction of the orbit position is performed with two independent systems: one to deal with the slow movements and one to correct the motion in a range of up to 200Hz but with a limited number of fast BPMs and steerers. This later will be removed and one unique system will cover the frequency range from DC to 200Hz using all the 224 BPMs and the 96 steerers. Indeed, thanks to the procurement of the Liberas Brilliance and installation of new AC power supplies, it is now possible to access all the Beam positions at a frequency of 10 kHz and to drive a small current in the steerers in a 400Hz bandwidth. The first tests of correction of the beam position have been performed and will be presented. This new orbit correction system is also a powerful diagnostics system: the measurement and survey of the Ring's lattice parameters is possible thanks to the high measurement rate of very high resolution position data. Results of this will also be presented.

MOPO006

DAΦNE Bunch-by-bunch Feedback Upgrade as SuperB Design Test

feedback, diagnostics, factory, luminosity

490

A. Drago
INFN/LNF, Frascati (Roma), Italy
D. Teytelman
Dimtel, San Jose, USA

DAΦNE, the PHI-factory located in Frascati, has always shown dynamic behavior strongly dependent on the bunch-by-bunch feedback, since its first runs in 1997. Over the years, to keep up with the evolving machine requirements, transverse and longitudinal systems have received multiple upgrades and updates. During fall 2010, all the six DAΦNE feedback systems have been upgraded to support the next run for KLOE as well as to test bunch-by-bunch feedback architectures intended for the future Italian SuperB factory. Both e+/e^- longitudinal feedback systems have been completely replaced with new hardware for increased reliability, better diagnostics and improved maintainability. In the effort to reduce residual dipole beam motion, determined by the front-end and quantization noise floor, vertical feedback systems now feature a 12-bit ADC, in place of the older 8-bit design. In the paper, we describe the hardware and software changes of this upgrade. Feedback performance analysis and beam dynamics data collected by the systems are presented.

MOPO011

The First 1 1/2 Years of TOTEM Roman Pot Operation at LHC

alignment, HOM, scattering, beam-losses

502

M. Deile, G.H. Antchev, R.W. Assmann, I. Atanassov, V. Avati, J. Baechler, R. Bruce, M. Dupont, K. Eggert, B. Farnham, J. Kaspar, F. Lucas Rodríguez, J. Morant, H. Niewiadomski, X. Pons, E. Radermacher, S. Ravat, F. Ravotti, S. Redaelli, G. Ruggiero, H. Sabba, M. Sapinski, W. Snoeys, G. Valentino, D. Wollmann
CERN, Geneva, Switzerland
R. Appleby
UMAN, Manchester, United Kingdom

Since the LHC running season 2010, the TOTEM Roman Pots (RPs) are fully operational and serve for collecting elastic and diffractive proton-proton scattering data. Like for other moveable devices approaching the high intensity LHC beams, a reliable and precise control of the RP position is critical to machine protection. After a review of the RP movement control and position interlock system, the crucial task of alignment will be discussed.

MOPO014

SVD-based Filter Design for the Trajectory Feedback of CLIC

ground-motion, feedback, luminosity, simulation

511

J. Pfingstner, D. Schulte, J. Snuverink
CERN, Geneva, Switzerland
M. Hofbaur
UMIT, Hall in Tirol, Austria

The orbit feedback of the Compact Linear Collider (CLIC) is the basic counter-measure against ground motion effects below 1 Hz in the beam delivery system and the main linac of CLIC. In this paper we present significant improvements of the orbit feedback design, by using time-dependent and spatial filters. The design procedure is based on a singular value decomposition (SVD) of the orbit response matrix and on loop-shaping techniques. This modified design has essential advantages compared to previous ones. The required beam position monitor resolution in the beam delivery system could be relaxed by a factor of five. At the same time the suppression of ground motion effects is improved. As a consequence, the tight tolerances for the allowable luminosity loss due to ground motion effects in CLIC can be met. The presented methods can be easily adapted to other accelerators in order to relax sensor tolerances and to efficiently suppress ground motion effects.

MOPO015

Operation Status of Bunch-by-bunch Feedback System in the TLS

feedback, injection, diagnostics, kicker

514

C.H. Kuo, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, K.H. Hu, C.-Y. Liao
NSRRC, Hsinchu, Taiwan

There are several FPGA based bunch-by-bunch feedback systems that were deployed in the Taiwan Light Source now. They play various roles to suppress beam instability. By using SPring-8 designed feedback processors is pioneer to apply in the storage ring of TLS successfully and help Dimtel system to be quick commission. The Dimtel feedback system provide a life spare unit and explore to control system integration especially to the EPICS toolkit system. Rich functionality includes of excitation of individual bunch or specifies bunches, averaged spectrum, tune measurement by the feedback dip in the averaged spectrum. Operation status of the system will be summary in this report.

MOPO016

Commissioning Tune Feedback in the Taiwan Light Source

feedback, insertion, insertion-device, undulator

517

C.H. Kuo, J. Chen, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, K.H. Hu, C.-Y. Liao, C.Y. Wu
NSRRC, Hsinchu, Taiwan

The tune control is important parameter in the insertion devices operation. There are many difference type insertion devices are disturbed in the storage ring of TLS. The traditional feed-forward control to correct orbit change and tune shift that isn’t enough when difference type insertion devices are operated with various condition. The tune feedback is used to solve the tune change problem. The stable tune measurement is necessary in the stable storage ring. There are various excited bunch train methods to get stable tune that will be also discussed in this report.

MOPO022

Precision Beam Instrumentation and Feedback-Based Beam Control at RHIC

feedback, coupling, acceleration, resonance

526

M.G. Minty, W. Fischer, H. Huang, R.L. Hulsart, C. Liu, Y. Luo, G.J. Marr, A. Marusic, K. Mernick, R.J. Michnoff, V. Ptitsyn, G. Robert-Demolaize, T. Roser, V. Schoefer, S. Tepikian, M. Wilinski
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
In this report we present advances in beam instrumentation required for feedback-based beam control at the Relativistic Heavy Ion Collider (RHIC). Improved resolution has contributed to enabling now routine acceleration with multiple feedback loops. Better measurement and control of the beam’s properties have allowed acceleration at a new working point and have facilitated challenging experimental studies.

MOPO026

Design, Manufacturing and Tests of Closed-loop Quadrupole Mover Prototypes for European XFEL

quadrupole, alignment, feedback, vacuum

535

J. Munilla, J. Calero, J.M. Cela-Ruiz, L. García-Tabarés, A. Guirao, J.L. Gutiérrez, T. Martínez de Alvaro, E. Molina Marinas, S. Sanz, F. Toral, C. Vazquez
CIEMAT, Madrid, Spain

Funding: Work partially supported by Spanish Ministry of Science and Innovation under SEI Resolution on 17-September-2009
In this report the development of a quadrupole mover with submicron repeatability is reported, which will be used in the intersections of the Undulator Systems of the European XFEL (EXFEL). It is part of the Spanish in-kind contribution to this facility. The main specifications include submicron repeatability for a 70 kg quadrupole magnet within compact dimensions and a ±1.5 mm stroke in the vertical and horizontal direction. Compact linear actuators based on 5-phase stepping motors have been chosen. Vertical actuator works in a wedge configuration to take mechanical advantage. A closed-loop control system has been developed to achieve this repeatability. For the feedback, one LVDT sensor for each axis was used. Mechanical switches are used to limit movement. In addition, hard-stops are included for emergency. Prototyping stage is done and a serial production of more than 90 devices is expected, so intense work has been done to achieve a reliable industrial production and validation. In this report, results of mechanical measurements including reproducibility, tests of different operation strategies and critical situations will be reported.

MOPO027

Status of a Study of Stabilization and Fine Positioning of CLIC Quadrupoles to the Nanometre Level*

quadrupole, feedback, alignment, damping

538

K. Artoos, C.G.R.L. Collette, M. Esposito, P. Fernandez Carmona, M. Guinchard, C. Hauviller, S.M. Janssens, A.M. Kuzmin, R. Leuxe, R. Moron Ballester
CERN, Geneva, Switzerland

Funding: The research leading to these results has received funding from the European Commission under the FP7 Research Infrastructures project EuCARD, grant agreement no.227579
Mechanical stability to the nanometre and below is required for the CLIC quadrupoles to frequencies as low as 1 Hz. An active stabilization and positioning system based on very stiff piezo electric actuators and inertial reference masses is under study for the Main Beam Quadrupoles (MBQ). The stiff support was selected for robustness against direct forces and for the option of incrementally repositioning the magnet with nanometre resolution. The technical feasibility was demonstrated by a representative test mass being stabilized and repositioned to the required level in the vertical and lateral direction. Technical issues were identified and the development programme of the support, sensors, and controller was continued to increase the performance, integrate the system in the overall controller, adapt to the accelerator environment, and reduce costs. The improvements are implemented in models, test benches, and design of the first stabilized prototype CLIC magnet. The characterization of vibration sources was extended to forces acting directly on the magnet, such as water-cooling induced vibrations. This paper shows the achievements, improvements, and an outlook on further R&D.

MOPO028

Modal Analysis and Measurement of Water Cooling Induced Vibrations on a CLIC Main Beam Quadrupole Prototype*

quadrupole, ground-motion, resonance, damping

541

K. Artoos, C.G.R.L. Collette, M. Esposito, P. Fernandez Carmona, M. Guinchard, S.M. Janssens, R. Leuxe, M. Modena, R. Moron Ballester, M. Struik
CERN, Geneva, Switzerland
G. Deleglise, A. Jeremie
IN2P3-LAPP, Annecy-le-Vieux, France

Funding: The research leading to these results has received funding from the European Commission under the FP7 Research Infrastructures project EuCARD, grant agreement no. 227579.
To reach the Compact Linear Collider (CLIC) design luminosity, the mechanical jitter of the CLIC main beam quadrupoles should be smaller than 1.5 nm integrated root mean square (r.m.s.) displacement above 1 Hz. A stiff stabilization and nano-positioning system is being developed but the design and effectiveness of such a system will greatly depend on the stiffness of the quadrupole magnet which should be as high as possible. Modal vibration measurements were therefore performed on a first assembled prototype magnet to evaluate the different mechanical modes and their frequencies. The results were then compared with a Finite Element (FE) model. The vibrations induced by water-cooling without stabilization were measured with different flow rates. This paper describes and analyzes the measurement results.

MOPO029

Validation of a Micrometric Remotely Controlled Pre-alignment System for the CLIC Linear Collider using a Test Setup (Mock-up) with 5 Degrees of Freedom

quadrupole, alignment, target, feedback

544

H. Mainaud Durand, M. Anastasopoulos, J. Kemppinen, R. Leuxe, M. Sosin, S. griffet
CERN, Geneva, Switzerland

The CLIC main beam quadrupoles need to be pre-aligned within 17μm rms with respect to a straight reference line along a sliding window of 200 m. A re-adjustment system based on eccentric cam movers, which will provide stiffness to the support assembly, is being studied. The cam movers were qualified on a 1 degree of freedom (DOF) test setup, where a repeatability of adjustment below 1 μm was measured along their whole range. This paper presents the 5 DOF mock-up, built for the validation of the eccentric cam movers, as well as the first results of tests carried out: resolution of displacement along the whole range, measurements of the support eigenfrequencies.

MOPO030

Theoretical and Practical Feasibility Demonstration of a Micrometric Remotely Controlled Pre-alignment System for the CLIC Linear Collider

alignment, linac, simulation, target

547

H. Mainaud Durand, M. Anastasopoulos, N.C. Chritin, J. Kemppinen, M. Sosin, S. griffet
CERN, Geneva, Switzerland
T. Touzé
ENSTA, Brest, France

The active pre-alignment of the Compact Linear Collider (CLIC) is one of the key points of the project: the components must be pre-aligned w.r.t. to a straight line within a few microns over a sliding window of 200 m, along the two linacs of 20 km each. The proposed solution consists of stretched wires of more than 200 m, overlapping over half of their length, which will be the reference of alignment. Wire Positioning Sensors (WPS), coupled to the supports to be pre-aligned, will perform precise and accurate measurements within a few microns, w.r.t. these wires. A micrometric fiducialisation of the components and a micrometric alignment of the components on common supports will make the strategy of pre-alignment complete. In this paper, the global strategy of active pre-alignment is detailed and illustrated by the latest results demonstrating the feasibility of the proposed solution.

MOPO032

The Survey Status at NSRRC during the TPS Civil Construction

survey, alignment, site, photon

553

H.M. Luo, J.-R. Chen, Chen, M. L. Chen, H.C. Ho, K.H. Hsu, W.Y. Lai, C.J. Lin, S.Y. Perng, P.L. Sung, Y.L. Tsai, T.C. Tseng, H.S. Wang
NSRRC, Hsinchu, Taiwan

In this paper, the survey status at NSRRC site duirng the TPS (Taiwan Photon Source) civil construction is described. The TLS (Taiwan Light Source) ring is still under operation in the meantime. In order to maintain the TLS for normal operation and also monitoring the building construction, an expanded survey setups including permanent leveling and GPS monuments were installed both on the site and TPS building. Combined with the orignal TLS survey sockets and sensor monitoring system (hydrostatic leveling system and precision inclination sensors) installed both in the TLS storage ring and beamlines, an extensive survey tasks were performed. The ground deformation situation of the TLS and deviation of the TPS building construction are presented.

MOPO034

From Survey Alignment toward Auto-alignment for the Installation of the TPS Storage Ring Girder System

laser, survey, alignment, photon

559

T.C. Tseng, Chen, M. L. Chen, H.C. Ho, K.H. Hsu, W.Y. Lai, C.J. Lin, H.M. Luo, S.Y. Perng, P.L. Sung, Y.L. Tsai, H.S. Wang
NSRRC, Hsinchu, Taiwan
J.-R. Chen
National Tsing Hua University, Hsinchu, Taiwan

The TPS (Taiwan Photon Source) project is now under civil construction. The whole building is constructed half underground and 12m deep compared to the TLS due to the stability consideration, so the survey and alignment works are quite confined and difficult. For positioning the magnets precisely and quickly, a high accuracy auto-tuning girders system combined with survey network procedures were established to accomplish the installation tasks. The position data from the survey network will define a basis for the motorized girder system to auto-tune and improve the accuracy. A mockup of one twenty-fourth section (one cell) had been installed at NSRRC for interface examination and further testing. In this paper, the procedures from the traditional survey network to auto-aliment system design and algorithm are described. Meanwhile, a preliminary testing result is also included.

MOPO037

Concept of Femtosecond Timing and Synchronization Scheme at ELBE

laser, electron, status, pick-up

565

M. Kuntzsch, A. Büchner, M. Gensch, A. Jochmann, T. Kirschke, U. Lehnert, F. Röser
HZDR, Dresden, Germany
M.K. Bock, M. Bousonville, M. Felber, T. Lamb, H. Schlarb, S. Schulz
DESY, Hamburg, Germany

The Radiation Source ELBE at Helmholtz-Zentrum Dresden-Rossendorf is undergoing an extension to offer capacity for various applications. The extension includes the setup of a THz-beamline with a dedicated laboratory and a beamline for electron-beam - high-power laser interaction. The current synchronization scheme offers stability on the picoseconds level. For pump-probe experiments using optical lasers, the desired synchronization between the pump and the probe pulse should be on the femtosecond scale. In the future there will be an optical synchronization system with a pulsed fiber laser as an optical reference. The laser pulses will be distributed over stabilized fiber links to the remote stations. It is planned to install EOM-based beam arrival time monitors (BAMs) in order to monitor the bunch jitter and to establish a beam-based feedback to reduce the jitter. Besides that, the timing system has to be revised to generate triggers for experiments with low repetition rate, two electron guns (thermionic DC, superconducting RF) and several lasers. The Poster will show the possible layout of the future Timing and Synchronization System at ELBE.

MOPO040

RF Reference Distribution for the Taiwan Photon Source

synchrotron, laser, diagnostics, LLRF

571

K.H. Hu, Y.-T. Chang, J. Chen, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, S.Y. Hsu, C.H. Kuo, D. Lee, C.-Y. Liao, C.Y. Wu
NSRRC, Hsinchu, Taiwan

Taiwan Photon Source (TPS) is a low-emittance 3-GeV synchrotron light source with circumference of 518.4 m which is being under construction at National Synchrotron Radiation Research Center (NSRRC) campus. Low noise 500 MHz master oscillator and novel fiber based CW RF reference distribution system will be employed to take advantages of advanced technology in this field and deliver better performance. The preliminary test of the prototype system is summarized in this report.

MOPO041

Preliminary Testing of TPS Timing System

gun, linac, booster, EPICS

574

C.Y. Wu, Y.-T. Chang, J. Chen, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Kuo, C.-Y. Liao
NSRRC, Hsinchu, Taiwan

The timing system of Taiwan Photon Source (TPS) provides synchronization for electron gun, modulators of linac, pulse magnet power supplies, booster power supply ramp, bucket addressing of storage ring, diagnostic equipments, beamline gating signal for top-up injection. The timing system utilizes a central event generator to generate events and distribute them over optic fiber network, and decodes them at the event receivers. The system supports uplink functionality which will be used for the fast interlock system to distribute signals like beam dump and post-mortem trigger. The timing system has now been in operation for Linac of TPS. This paper presents prototype for the timing system of TPS.

MOPS023

An Analytical Lagrangian Model for Analyzing Temperature Effects in Intense Non-neutral Beams*

emittance, simulation, focusing, space-charge

646

E.G. Souza, A. Endler, R. Pakter, F.B. Rizzato
IF-UFRGS, Porto Alegre, Brazil

High-intensity charged-particle beams are used in several areas of physics. We can mention as an illustration, high-energy colliders, particle accelerators and vacuum electron devices. In all cases quoted above, the beam lose particles in the acceleration process, between its production to its final destination. These ejected particles, generally, produce a surrounding structure around the beam core, called halo. This undesirable structure is seen in simulation as well as in actual linacs, and its formation has been one of the main sources of energy loss in the acceleration devices. For this reason, the need for an advance in understand the mechanism that produce the halo becomes necessary. In view of the whole problem, we contruct a 1D Lagrangian warm-fluid model for describe the behavior of inhomogeneous charged-particle beam in solenoidal focusing magnetic field. The equations of motion are derived for an adiabatic process with a state equation originated from the ideal gas law. In the end, the model is compared with self-consistent simulation and is used to explain emittance growth and jets of particle, even when the system is out of equilibrium.

MOPS089

Identification of Bunch Dynamics in the Presence of E-cloud and TMCI for the CERN SPS Ring

simulation, feedback, coupling, kicker

811

O. Turgut, J.D. Fox, C.H. Rivetta, S. Uemura
SLAC, Menlo Park, California, USA
W. Höfle
CERN, Geneva, Switzerland

Funding: Work is supported by the U.S. Department of Energy under contract DE-AC02-76SF00515 and the US LHC Accelerator Research Program (LARP).
Measurements and multi-particle simulation codes (i.e. HEAD-TAIL, WARP, CMAD) indicate that bunched particle beams show unstable motions induced by electron-clouds and strong head-tail interactions. The bunch dynamics exhibits highly non-linear, complex and unstable behavior under certain operating conditions. Feedback control systems have been proposed to mitigate these instabilities in the CERN SPS ring. The design of feedback systems requires the knowledge of a reduced dynamic model of the bunch. It allows to include and quantify the effect of noise and signal perturbations, as well as system robustness to parameter variation. Identification techniques are used to estimate those models based on bunch motion measurements. In this work we present reduced mathematical models representing the transverse bunch dynamics and identification techniques to extract the model parameters based on measurements. These techniques are validated using time domain simulations of the bunch motion conducted using multi-particle simulation codes. For that, different sections of the bunch are driven by random signals, and the vertical motion of those areas is used to estimate the reduced model.

MOPZ011

An Automated Conditioning System for the MUCOOL Experiments at Fermilab

cavity, pick-up, vacuum, collider

844

A. Kurup
Imperial College of Science and Technology, Department of Physics, London, United Kingdom

The MUCOOL project aims to study RF cavities for the Neutrino Factory and the Muon Collider. The large emittance muon beams in these accelerators require high-gradient RF cavities at low-frequencies and they need to operate in the presence of relatively strong magnetic fields. MUCOOL is conducting a number of tests on 805MHz and 201 MHz cavities in order to develop a technology that can meet all of these requirements. An automated conditioning system was developed for the 805MHz test program for MUCOOL. This system was designed to replicate the logic a human operator would use when conditioning an RF cavity and to provide automated logging of the conditioning process. This paper describes the hardware and software of the system developed.

MOPZ013

MAUS: MICE Analysis User Software

emittance, simulation, extraction, factory

850

C.D. Tunnell
JAI, Oxford, United Kingdom
C.T. Rogers
STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom

The Muon Ionization Cooling Experiment (MICE) is unique because it measures accelerator physics quantities using particle physics methods. It follows that the software that forms the theoretical model of MICE needs to be able to not only propagate beam envelopes and optical parameters but also model detector responses and matter effects for cooling. MICE addresses this dichotomy with the software framework MAUS in order to maximize its physics sensitivity whilst providing the conveniences of, for example, a common data structure. The diversity of challenges that MICE provides from the analysis perspective means that appropriately defining the software scope and layout is critical to the correctness and maintainability of the final accelerator physics analyses. MICE has structured its code into a Map-Reduce framework to enable better parallelization whilst also introducing unit, functional, and integration tests to ensure code reliability and correctness. These methods can apply to other experiments.

MOPZ024

Muon Ionization Cooling Experiment: Controls and Monitoring

EPICS, emittance, monitoring, target

856

P.M. Hanlet
IIT, Chicago, Illinois, USA
C.N. Booth
Sheffield University, Sheffield, United Kingdom

Funding: NSF PHY0842798
The Muon Ionization Cooling Experiment (MICE) is a demonstration experiment to prove the viability of cooling a beam of muons for use in a Neutrino Factory and Muon Collider. The MICE cooling channel is a section of a modified Study II cooling channel which will provide a 10% reduction in beam emittance. In order to ensure a reliable measurement, we intend to measure the beam emittance before and after the cooling channel at the level of 1%, or an absolute measurement of 0.001. This renders MICE as a precision experiment which requires strict controls and monitoring of all experimental parameters in order to control systematic errors. The MICE Controls and Monitoring system is based on EPICS and integrates with the DAQ and Data monitoring systems. A description of this system, its implementation, and performance during recent muon beam data collection will be discussed.
For the MICE collaboration.

TUODB03

Innovative Design of the Fast Switching Power Supplies for the SOLEIL EMPHU Insertion and its Fast Correctors

power-supply, undulator, simulation, permanent-magnet

982

F. Bouvet, D. Aballea, R. Ben El Fekih, S. Bobault, M. Bol, Y. Bouanani, Y. Dietrich, A. Hardy, F. Marteau
SOLEIL, Gif-sur-Yvette, France

A new electromagnetic/permanent magnets helical undulator has been designed and is under commissioning at SOLEIL. For a fast switching of the photon polarization, it requires a power supply able to switch between +/350 A within 50 ms, without any current overshoot and with a very good current resolution over the full scale (50 ppm). The in-house design is based on two full switching bridges with interleaved commands. Combined with a regulation scheme using sophisticated algorithms, such a design enables to reach a high control bandwidth, permitting fast transitions. Such a fast and accurate system needs well performing digital control electronics. We chose the digital control cards developed at Paul Scherrer Institute (Villigen CH) for the SLS (Swiss Light Source). The components, measurements, interlocks, control interfaces, and electronic cards were developed and assembled together at SOLEIL. This paper will present the main lines of this development and the performances achieved during the EMPHU insertion commissioning. The design of the fast power supplies (±20 A) needed for corrector magnets of this insertion will also be presented.

Slides TUODB03 [3.017 MB]

TUPC010

Status of the Manufacturing of Accelerating Structures for LINACs

linac, vacuum, extraction, laser

1009

F.M. Mirapeix, J. Añel, J. Castillo, A. Ortiz
HTS, Mendaro, Spain
X. Aldalur, J. Amores, A. Urzainki
DMP, Mendaro, Spain

Funding: HTS, DMP, ZEHATZ, CERN
Particle accelerators need ongoing development in the state of the art of the field: high-quality manufacturing of accelerating structures, PETS, but also drift tubes, bunchers, high-power couplers, alignment systems, precision test stands, etc. They also require engineering projects in the range of mechatronics, thermodynamics, microwaves, ultra high vacuum, cryogenics, joining techniques, high precision manufacturing, 3D high precision scanning, etc. HTS together with DMP are actually working on all this fronts. In this paper, the actual status of the manufacturing capabilities concerning some accelerating structures will be described.

TUPC031

Advanced Research Electron Accelerator Laboratory Based on Photocathode RF Gun

gun, electron, emittance, laser

1066

B. Grigoryan, G.A. Amatuni, V.S. Avagyan, A. Grigoryan, M. Ivanyan, V.G. Khachatryan, E.M. Laziev, K. Manukyan, I.N. Margaryan, V. Sahakyan, A. Sargsyan, A. Tarloyan, A.V. Tsakanian, V.M. Tsakanov, A. Vardanyan
CANDLE, Yerevan, Armenia
T. Vardanyan
YSU, Yerevan, Armenia

The low energy sub-picosecond duration electron bunches with extremely small beam emittance have wide applications in advanced research of new accelerator concepts, radiation physics, time-resolved pulse radiolysis and electron diffraction. The conceptual design and experimental program of the Advanced Research Electron Accelerator Laboratory (AREAL) at CANDLE based on photocathode RF gun are presented. The AREAL design implies single and multibunch operation modes with variable beam energy of 5-20 MeV and 10-100 pC bunch charge. The design is based on 3 GHz 1.6 cells RF gun followed by S-Band accelerating linac.

TUPC042

First Beam to FACET

linac, electron, positron, vacuum

1093

R.A. Erickson, C.I. Clarke, W.S. Colocho, F.-J. Decker, M.J. Hogan, S. Kalsi, N. Lipkowitz, J. Nelson, N. Phinney, P. Schuh, J. Sheppard, H. Smith, T.J. Smith, M. Stanek, J.L. Turner, J. Warren, S.P. Weathersby, U. Wienands, W. Wittmer, M. Woodley, G. Yocky
SLAC, Menlo Park, California, USA

Funding: This work was supported by the Department of Energy contract DE-AC02-76SF00515.
The SLAC 3km linear electron accelerator has been reconfigured to provide a beam of electrons to the new FACET facility while simultaneously providing an electron beam to the Linac Coherent Light Source (LCLS). FACET is a new experimental facility constructed in the linac tunnel that can transport, compress, and focus electron bunches to support a variety of accelerator R&D experiments. In this paper, we describe our first experiences with the operation of the linac for this new facility.

TUPC089

New Digital NMR System for an Old Analyzing Magnet

power-supply, cyclotron, feedback, resonance

1215

Z. Kormány, I. Ander
ATOMKI, Debrecen, Hungary

The analyzing magnet of the ATOMKI cyclotron measures the beam energy with high precision and can lower its energy spread to ~5x10^-4. The highly stable magnetic field is achieved by a NMR-feedback in the control loop of the power supply. The original analog system was designed and built over 25 years ago applying mainly obsolete, partly nowadays unavailable components. Maintaining and keeping the system running required increasing efforts every year. A new digital system has been developed to replace the old one. Except the high-frequency signal domain (HF oscillator and preamplifier) it performs every processing digitally. Its heart is a mixed-signal microcontroller that generates the signals for the NMR-probe, measures the amplitude and frequency of the oscillation, evaluates the demodulated signal and controls the power supply. A fast NMR-pulse detection algorithm was developed; as a result the embedded program can perform all measuring, detecting and controlling tasks in real-time. A PC connects to the controller, sends commands and displays the received signals and status data. The control software allows easy handling of the complete system with nearly automated operation.

TUPC115

Application of Libera Brilliance Single Pass at NSRL Linac BPM System

brilliance, linac, pick-up, injection

1284

J.Y. Zou, J. Fang, P. Lu, T.J. Ma, B.G. Sun, Y.L. Yang, Z.R. Zhou
USTC/NSRL, Hefei, Anhui, People's Republic of China

Libera Brilliance Single Pass is a digital beam position processor with capabilities of single pass position measurement. This device can be used on the stripline beam position monitor (BPM) of the linac and transfer lines on light sources as well as injector system for the FELs. The linac of Hefei light source (HLS) was equipped with 2 stripline beam position monitors, which will be increased to 20 BPMs after upgrading. The existing BPM electronics were the homemade electronics with logarithm detector. To enhance the functionality of the BPM system, the Libera Brilliance Single Pass is employed to replace the existing BPM electronics. The newly buying devices have made test of characterization. The mapping of stripline BPM is made on a workbench with Libera Brilliance Single Pass. The beam position is tested at linac using Libera Brilliance Single Pass. And the results of these measurement performed on Libera are reported to compared to measurements with the linac’s existing BPM electronics.

TUPC116

Beam Diagnostics Global Data Warehouse Implementation and Application at SSRF*

diagnostics, EPICS, feedback, monitoring

1287

Y.B. Leng, Z.C. Chen, Y.B. Yan, R.X. Yuan
SSRF, Shanghai, People's Republic of China

A fully functional beam diagnostics system has been developed at SSRF serving user operation and machine study since 2009. Global orbit disturbances, BPM failures and DCCT noise signal have been observed randomly. Without correct event trigger it is hard to capture real time data and analyze the cause of the above failures. A BI global data warehouse has been implemented as a solution to buffer online data and do correlation analyze at SSRF.

TUPC123

Evaluation of New Generation Heavy Particle Beam Diagnostics Instrumentation

hadron, single-bunch, instrumentation, diagnostics

1305

B.B. Baricevic, A. Košiček, J. Menart, M. Znidarcic
I-Tech, Solkan, Slovenia

Abstract: This paper presents the achievements in the field of heavy particle beam diagnostics instrumentation. Two different instruments are presented: Libera Single Pass H and Libera Hadron, designed for linear and circular heavy particle beam diagnostics applications respectively. Beside high precision beam position measurement application, these instruments offer much more. Accurate beam arrival time measurements, high resolution single bunch position and charge measurements, beam current and fill pattern measurements are performed. The instruments are evaluated through extensive laboratory measurements, on the real beam and on stepper-motor driven test-benches. Libera instruments are network attached devices, developed on uTCA based platform that enables smooth integration of many instruments in the control system network and a simplified implementation of custom signal processing algorithms.

TUPC125

Test of the Front-end Electronics and Acquisition System for the LIPAC BPMs

EPICS, pick-up, linac, LLRF

1311

D. Belver, I. Arredondo, P. Echevarria, J. Feuchtwanger, H. Hassanzadegan, M. del Campo
ESS-Bilbao, Zamudio, Spain
F.J. Bermejo
Bilbao, Faculty of Science and Technology, Bilbao, Spain
J.M. Carmona, A. Guirao, A. Ibarra, L.M. Martinez Fresno, I. Podadera
CIEMAT, Madrid, Spain
V. Etxebarria, J. Jugo, J. Portilla
University of the Basque Country, Faculty of Science and Technology, Bilbao, Spain
N. Garmendia, L. Muguira
ESS Bilbao, Bilbao, Spain

Funding: Work partially supported by Spanish Ministry of Science and Innovation under project AIC10-A-000441 and ENE2009-11230.
Non-interceptive Beam Position Monitors pickups (BPMs) will be installed along the beamlines of the IFMIF/EVEDA linear prototype accelerator (LIPAC) to measure the transverse beam position in the vacuum chamber in order to correct the dipolar and tilt errors. Depending on the location, the BPMs response must be optimized for a beam of 175 MHz bunch repetition, an energy range from 5 up to 9 MeV, a current between 0.1 and 125 mA and continuous and pulse operation. The requirements from beam dynamics for the BPMs are quite stringent, aiming for the position an accuracy below 100 μm and a resolution below 10 μm, and for the phase an accuracy below 2° and a resolution below 0.3°. To meet these specifications, the BPM electronics system developed by ESS-Bilbao has been adapted for its use with the BPMs of LIPAC. This electronics system is divided in an Analog Front-End unit, where the signals are conditioned and converted to baseband, and a Digital Unit to sample them and calculate the position and phase. The electronics system has been tested at CIEMAT with a wire test bench and a prototype BPM. In this contribution, the tests performed will be fully described and the results discussed.

TUPC129

A Beam Position System for Hadrontherapy Facilities

electron, photon, vacuum, proton

1323

A. Faus-Golfe, C. Belver-Aguilar, C. Blanch Gutierrez, J.J. García-Garrigós
IFIC, Valencia, Spain
E. Benveniste, M. Haguenauer, P. Poilleux
LLR, Palaiseau, France

Funding: MICINN-FPA:AIC10-D-000518
Essential parts of the needed instrumentation for the beam control in the Hadrontherapy accelerators are the Beam Position Monitors (BPM). The measurement of the beam position in Hadronterapy accelerators become more important at the secondary transport lines towards the patient room where this parameter must be completely determined. The BPM described in this paper is a new type of BPM based on four scintillating fibers coupled to four photodiodes to detect the light produced by the fibers when intercepting the beam. We present here the study of the different photodiodes able to read the light emitted by the scintillating fiber, the tests performed in order to find the most suitable photodiode to measure the beam position from the variations in the beam current, the mechanical design and the corresponding acquisition electronics.

TUPC134

Phase Detection Electronics for CLIC

pick-up, linac, luminosity, linear-collider

1338

A. Andersson
CERN, Geneva, Switzerland

The Compact Linear Collider (CLIC) requires very tight RF phase synchronisation in order to preserve high luminosity. The electronics required for processing the signals delivered from the phase pick-ups present a significant challenge. This paper discusses the strategy adopted to achieve a sufficiently accurate measurement of the phase. Performance measurements performed in the lab of some of the sub-systems are also presented.

TUPC143

New Techniques in the Synchronization of High-frequency Multichannel Acquisition Systems

instrumentation, neutron, background, induction

1359

R.A.J. Soden, Y.A. Maumary, C. Zaretti
Agilent Technologies SA, Plan-les-Ouates, Switzerland
S.J. Narciso, J.L. Richard
Agilent Technologies Inc., Loveland, USA

Today, high-speed digitizer systems operating at well above 100 MSa/s are being used in a diverse range of applications including operation of single-pulse linear induction accelerators for flash radiographic facilities, neutron energy measurement through time-of-flight, and propulsion research. A growing number of such applications require simultaneous measurement of high-frequency signals over many channels. Most of today’s high-speed digitizers or oscilloscopes feature a maximum of only four channels. For applications requiring more than four channels, and needing very precise time correlation between channels or accurate phase of continuous signals, it is necessary to synchronize the sampling clocks of the multiple instruments within the system. This paper presents methods of synchronization, with reference to large-scale multichannel data acquisition requirements in particle acceleration applications using modular instrumentation. A range of system architectures are presented, and advantages and disadvantages of each scheme are discussed.

TUPC144

Preliminary BPM Electrics Testing for the Taiwan Photon Source Project

injection, brilliance, electron, feedback

1362

C.H. Kuo, J. Chen, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, K.H. Hu, C.-Y. Liao
NSRRC, Hsinchu, Taiwan

The preliminary BPM electrics are developing and testing for Taiwan Photon Source (TPS), is a 3 GeV synchrotron light source which being in construction at NSRRC. This new BPM electronics with integrated FPGA based hardware, and will be testing in the TLS (Taiwan Light Source) with real beam at first. The enhance functionality of current generation will be adopted in the TPS. The electronic prototype testing and relative property will be reported in this report.

TUPC145

Vibration and Beam Motion Monitoring in TLS

EPICS, monitoring, photon, brilliance

1365

Y.K. Chen, J. Chen, P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Kuo
NSRRC, Hsinchu, Taiwan

Due to asynchronous nature of various vibration and beam motion related subsystems, it is hard to analysis the correlation between them. Therefore, the synchronous distributed data acquisition system is designed to make an improvement for better analysis. For different circumstances, the system supports two data flow: one is display the real-time data which could be archived continuously and the other is waveform which could be acquired on demand or triggered by event with high sampling rate. In addition, the viewer will improve some useful features, such as trigger by customize signal or EPICS PV record, automatic screenshot and plot the multiple history events. The preliminary test results and implementation details will be summarized in this report.

TUPC147

A Micro-Channel Plate Based Gas Ionization Profile Monitor with Shaping Field Electrodes for the ISIS H⁻ Injector

ion, vacuum, radiation, beam-losses

1371

P.G. Barnes, G.M. Cross, B.S. Drumm, S.A. Fisher, S.J. Payne, A. Pertica, C.C. Wilcox
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom

Beam profile measurements within the ISIS H⁻ injector line are achieved using destructive devices such as moving wire scanners. To avoid damage to the wires, measurements are made with the injector operating on reduced power. This paper reports the development of a Micro-Channel Plate based profile monitor which allows beam measurements to be made under normal operating conditions. The monitor produces profiles by measuring the +ion current resulting from the interaction of the H⁻ beam with the surrounding residual gas. The 32 channel Micro-Channel Plate is mounted on a rotating arm to enable it to be positioned parallel to the beam for calibration (all channels then measure the same +ion current) and perpendicular to the beam for profile measurements. A 15kV drift field is used together with field shaping electrodes to ensure a flat electric field gradient across the monitor, thereby minimising distortion of the profile due to the electric field. This paper details all aspects of the design and construction of this profile monitor. Beam profiles are compared to previous wire scanner results. Shaping field upgrades are discussed to improve the longitudinal field shape.

TUPS001

Upgrade of the ESRF Vacuum System

vacuum, storage-ring, cathode, synchrotron

1515

M. Hahn, J.C. Biasci, H.P. Marques, A. Meunier
ESRF, Grenoble, France

The upgrade program of the ESRF concerns in terms of electron storage ring vacuum chambers mainly the insertion device (ID) sectors. Here the length available for the production of intense synchrotron light is being increased from five to six or even seven meters. The presence of canted ID sectors where two independent synchrotron light beams will be produced in the same straight section requires new quadrupole chambers compatible with the new geometry. A number of long insertion device vacuum chambers for the new ID sectors has already been produced by ESRF and coated with non-evaporable getter (NEG) material, a new generation of in vacuum undulators for the extended ID sections are under preparation. This paper outlines the status of the modification of the vacuum system and informs about consequences for the ESRF NEG coating activity and some recent improvements of the vacuum measurement and control system.

TUPS003

Upgrade of the ESRF RGA System

vacuum, diagnostics, monitoring, survey

1521

A. Meunier, M. Hahn, I. Parat, J.L. Pons
ESRF, Grenoble, France

In the frame of the ESRF upgrade program, the Residual Gas Analyzer (RGA) system has been reviewed. A campaign of RGA refurbishment has been started recently giving more reliability and accuracy on partial pressure vacuum control. Based on new technologies and our operating experience, new RGA monitoring application and diagnostic tools have been developed. This paper outlines the evolution of the actual RGA system focusing on the controlled hardware installation description, on software and user interface developments. The continuous follow up of a defined number of partial pressure measurements using different dynamic control modes will be described.

TUPS007

Construction and Test of a Cryocatcher Prototype for SIS100*

ion, vacuum, heavy-ion, beam-losses

1527

L.H.J. Bozyk, D.H.H. Hoffmann
TU Darmstadt, Darmstadt, Germany
H. Kollmus, P.J. Spiller, M. Wengenroth
GSI, Darmstadt, Germany

Funding: EU-FP-7 project COLMAT, FIAS
The main accelerator, SIS100, of the FAIR-facility will provide heavy ion beams of highest intensities. Ionization beam loss is the most important loss mechanism at operation with high intensity, intermediate charge state heavy ions. A special synchrotron design has been developed for SIS100, aiming for hundred percent control of ionization beam loss by means of a dedicated cold ion catcher system. To suppress dynamic vacuum effects, the cryo catcher system shall also provide a significantly reduced effective desorption yield. The construction and tests of a prototype cryo ion catcher is a workpackage of the EU-FP-7 project COLMAT. A prototype test setup including cryostat has been constructed, manufactured and tested at GSI under realistic conditions with heavy ion beams of the of the heavy ion synchrotron SIS18. The design and results are presented.

TUPS020

Leak Tightness of LHC Cold Vacuum Systems

vacuum, cryogenics, superconducting-magnet, proton

1566

P. Cruikshank, S.D. Claudet, W. Maan, L. Mourier, A. Perrier-Cornet, N. Provot
CERN, Geneva, Switzerland

The cold vacuum systems of the LHC machine have been in operation since 2008. While a number of acceptable helium leaks were known to exist prior to cooldown and have not significantly evolved over the last years, several new leaks have occurred which required immediate repair activities or mitigating solutions to permit operation of the LHC. The LHC vacuum system is described together with a summary and timetable of known air and helium leaks and their impact on the functioning of the cryogenic and vacuum systems. Where leaks have been investigated and repaired, the cause and failure mechanism is described. We elaborate the mitigating solutions that have been implemented to avoid degradation of known leaks and minimize their impact on cryogenic operation and LHC availability, and finally a recall of the consolidation program to be implemented in the next LHC shutdown.

TUPS024

Development of Beryllium Vacuum Chamber Technology for the LHC

vacuum, electron, collider, background

1578

R. Veness
CERN, Geneva, Switzerland
C. Dorn, G. Simmons
Materion Electrofusion, Fremont, California, USA

Beryllium is the material of choice for the beam vacuum chambers around collision points in particle colliders due to a combination of transparency to particles, high specific stiffness and compatibility with ultra-high vacuum. New requirements for these chambers in the LHC experiments have driven the development of new methods for the manufacture of beryllium chambers. This paper reviews the requirements for experimental vacuum chambers. It describes the new beryllium technology adopted for the LHC and experience gained in the manufacture and installation.

TUPS029

Development of a Feedthrough with Small Reflection for the TPS BPM

impedance, synchrotron, vacuum

1593

Huang, Y.T. Huang, C.-C. Chang, C.L. Chen, G.-Y. Hsiung, S-N. Hsu, H.P. Hsueh
NSRRC, Hsinchu, Taiwan
J.-R. Chen
National Tsing Hua University, Hsinchu, Taiwan

The TPS BPM feedthrough is a coaxial cable with a structure of a kind for which power loss occurs readily at places at which exists an impedance mismatch. With an impedance equation for a simple coaxial cable combined with a multi-dielectric modification, a model feedthrough with small reflection has been designed. With careful setting of brazing conditions and precise control of the dimensions of devices, a TPS prototypical BPM feedthrough having a reflection coefficient less than 0.05 was manufactured. The eccentricity was constrained within 0.03 mm, and the deviation of measured capacitance of button electrodes was less than 7 %.

TUPS037

Preliminary Assessment of Beam Impact Consequences on LHC Collimators

simulation, proton, collimation, beam-losses

1617

M. Cauchi, R.W. Assmann, A. Bertarelli, R. Bruce, F. Carra, A. Dallocchio, D. Deboy, N. Mariani, A. Rossi, N.J. Sammut
CERN, Geneva, Switzerland
M. Cauchi, P. Mollicone
UoM, Msida, Malta
L. Lari
IFIC, Valencia, Spain

The correct functioning of the LHC collimation system is crucial to attain the desired LHC luminosity performance. However, the requirements to handle high intensity beams can be demanding. In this respect, the robustness of the collimators plays an important role. An accident which causes the proton beam to hit a collimator might result in severe beam-induced damage and, in some cases, replacement of the collimator, with consequent downtime for the machine. In this paper, several case studies representing different realistic beam impact scenarios are shown. A preliminary analysis of the thermal response of tertiary collimators to beam impact is presented, from which the most critical cases can be identified. Such work will also help to give an initial insight on the operational constraints of the LHC by taking into account all relevant collimator damage limits.

TUPS040

Driving the LHC Collimators' Stepping Motors over 1 km with High Accuracy avoiding EMI Effects

feedback, impedance, beam-losses, radiation

1626

A. Masi, G. Conte, R. Losito, M. Martino
CERN, Geneva, Switzerland

The LHC collimators are exposed to very high levels of radiation, which means that the power drivers must be installed far from the stepping motors that they drive. Due to the geometry of the underground installations, the distances can be up to 1 km. The long cables that connect the drivers to the motors behave as transmission lines modifying dramatically the impedance seen by the drivers and consequently jeopardizing the control performance of Pulse Width Modulation (PWM) drivers. In this paper we address this problem, provide an analytical model of the driver-cable-motor system and describe the analog solution we have developed to improve the performance of a typical off the shelf driver. Finally we characterize the improvement of the performances with measurements of positioning repeatability and show that electromagnetic emissions from the long cables are drastically reduced, making the use of stepping motors compatible with extremely sensitive instrumentation such as the LHC Beam Loss Monitors (BLM).

TUPS051

Design and Performance of the MICE Target*

target, acceleration, extraction, vacuum

1644

C.N. Booth, P. Hodgson, E. Overton, M. Robinson, P.J. Smith
Sheffield University, Sheffield, United Kingdom
G.J. Barber, K.R. Long
Imperial College of Science and Technology, Department of Physics, London, United Kingdom
E.G. Capocci, J.S. Tarrant
STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
B.J.A. Shepherd
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom

Funding: UK Science and Technology Facilities Council
The MICE experiment uses a beam of low energy muons to study ionisation cooling. This beam is derived parasitically from the ISIS synchrotron at the Rutherford Appleton Laboratory. A mechanical drive has been developed which rapidly inserts a small titanium target into the beam after acceleration and before extraction, with minimal disturbance to the circulating protons. One mechanism has operated in ISIS for over half a million pulses, and its performance will be summarised. Upgrades to this design have been tested in parallel with MICE operation; the improvements in performance and reliability will be presented, together with a discussion of further future enhancements.

TUPS052

An FPGA Based Controller for the MICE Target

target, injection, extraction, EPICS

1647

P.J. Smith, C.N. Booth, P. Hodgson, E. Overton, M. Robinson
Sheffield University, Sheffield, United Kingdom
J. Leaver, K.R. Long
Imperial College of Science and Technology, Department of Physics, London, United Kingdom

Funding: UK Science and Technology Facilities Council
The MICE experiment uses a beam of low energy muons to test the feasibility of ionization cooling. This beam is derived parasitically from the ISIS accelerator at the Rutherford Appleton Laboratory. A target mechanism has been developed that rapidly inserts a small titanium target into the circulating proton beam immediately prior to extraction without unduly disturbing the primary ISIS beam. The original control electronics for the MICE target was based upon an 8-bit PIC. Although this system was fully functional it did not provide the necessary IO to permit full integration of the target electronics onto the MICE EPICS system. A three phase program was established to migrate both the target control and DAQ electronics from the original prototype onto a fully integrated FPGA system that is capable of interfacing with EPICS through a local PC. This paper discusses this upgrade program, the motivation behind it and the performance of the upgraded target controller.

TUPS061

CERN Safety Alarm Monitoring

monitoring, site, fibre-optics, power-supply

1674

H. Nissen, S. Grau
CERN, Geneva, Switzerland

The CERN Safety Alarm Monitoring system acquires safety alarms and safety information generated by CERN safety equipment such as fire and gas detectors, evacuation, emergency stops and other safety related systems, which are located in both surface and underground areas of CERN sites and accelerators. Currently there are 22170 alarms from 10²⁵ safety equipments. This information is transmitted in a high priority and diversely redundant way to the CERN Safety Control Room for immediate intervention of the CERN Fire Brigade. The system was designed based on two main standards, the EN 50136 and IEC 61508 and was commissioned in 2003. In 2009 it was decided to launch a consolidation project in order to upgrade both hardware and software. The consolidation project includes deployment of a private CERN wide fiber optic TCP/IP network for the transmission of safety alarms, an upgrade of the SCADA software, a database upgrade and the replacement of all computers. In this paper the system is presented, the ongoing consolidating work is detailed and the middle and long term improvement plans for the system are described.

TUPS063

Power Saving Schemes in the NSRRC

synchrotron, synchrotron-radiation, status, radiation

1680

J.-C. Chang, Y.F. Chiu, J.-M. Lee, Y.-C. Lin, C.Y. Liu, Z.-D. Tsai, T.-S. Ueng
NSRRC, Hsinchu, Taiwan

National Synchrotron Radiation Research Center (NSRRC), Taiwan will complete the construction of the civil and utility system engineering of the Taiwan Photon Source (TPS) in the end of 2012. The power consumption of the TPS is estimated about 2.3 times of that of the existed Taiwan Light Source (TLS). To cope with increasing power requirement in the near future, we have been conducting several power saving schemes, which include power requirement control, optimization of chillers operation, application of heat pump, air conditioning system improvement, power factor improvement and the lighting system improvement.

TUPS064

Construction Status of the Utility System for the 3GeV TPS Storage Ring

storage-ring, status, booster, power-supply

1683

J.-C. Chang, J.-R. Chen, Y.-C. Chung, C.K. Kuan, K.C. Kuo, J.-M. Lee, Y.-C. Lin, C.Y. Liu, I. Liu, Z.-D. Tsai
NSRRC, Hsinchu, Taiwan

The construction of the utility system for the 3.0 GeV Taiwan Photon Source (TPS) has been contracted out in the end of 2009. The whole construction of the utility system is scheduled to be completed in the end of 2012. Total budget of this construction is about four million dollars. The utility system includes the electrical power, cooling water, air conditioning, compressed air and fire control systems. The TPS construction site is located adjacent to TLS. Some areas of TPS and TLS are overlapped. Under tight schedule, limit budget and geographic constrains, it is a challenge to complete the utility system construction of TPS on time, on budget, and to specification. This paper presents some main issues and status of the utility system construction for the TPS storage ring.

TUPS065

Design of the De-ionized Water Treatment for Taiwan Photon Source

ion, status, storage-ring, photon

1686

Z.-D. Tsai, W.S. Chan, C.K. Kuan
NSRRC, Hsinchu, Taiwan

This work presents the water treatment design of Taiwan Photon Source (TPS). The system design is influenced by supplied water quality, water quantity and the selected process scheme. The system is composed of a pretreatment, make-up, and points-of-use filtration systems. The pretreatment system consists of an active carbon tower, a normally cartridge filter and a reversed osmosis (RO) unit. Furthermore, the make-up system consists of an ultraviolent (UV) TOC reduction unit and a ion-exchange resin unit. Following the water treatment process, the proposed system can provide high quality de-ionized water whose resistivity is better than 10 MΩ-cm at 25±0.1 degree C and dissolved oxygen is less than 10 ppb.

TUPS066

Design of Front End Safety Interlock System for Taiwan Photon Source

photon, radiation, status, vacuum

1689

H.Y. Yan, J.-R. Chen, G.-Y. Hsiung, C.K. Kuan, I.C. Sheng, Z.-D. Tsai
NSRRC, Hsinchu, Taiwan

Safety interlock is one of critical subsystems in synchrotron radiation accelerator. A front end (FE) interlock prototype system has been designed, fabricated, and initially tested for Taiwan Photon Source (TPS). TPS FE interlock logic is designed based on that of Taiwan Light Source (TLS), and moderately modified due to the accelerator parameter discrepancy between TPS and TLS. The programmable automation controllers (PAC) have been utilized in FE safety interlock system for their reliability, convenience, processing capability, communication, and stability in user interface. In FE PAC system, touch panels are used as the graphical user interface (GUI) to control and monitor FE components. In addition, with GUI control it is used to beam position monitoring devices as well as confined beam sizes aperture for beam line users. The interlock design such as data acquisition and parameters monitoring for vacuum pressure, flow rate of cooling water, pressure of compressive air, chamber and water temperature, and overall interlock logic are also presented in this paper.

TUPS068

The GSI RF Maintenance & Diagnostics Project

LLRF, diagnostics, status, cavity

1695

K.-P. Ningel, H. Klingbeil, B. Zipfel
GSI, Darmstadt, Germany
A. Honarbacht, M. Proske
Ubisys Technologies GmbH, Düsseldorf, Germany
H. Veldman
LogiTrue, Polokwane, South Africa

From time-to-time, microcontroller- and FPGA-based LLRF electronics devices need maintenance of firmware and configuration data. The system described here allows this and also long term monitoring of functionality and performance. Both requirements cover measuring devices that operate under a common operating system as well as modules only addressable by means of GPIOs or their programming interface. For large accelerator systems like in the FAIR project, a Web-based remotely controlled system was designed in close collaboration with two industrial partners. To cover the requirements of the extremely different types of participating modules while remaining flexible for future extensions, the system was designed with a maximum of modularity and a strong focus on high reliability and safety. This contribution describes the global structure and the actual status of the RF Maintenance and Diagnostics System. Several types of measuring equipment and LLRF modules such as a phase control loop system and an IF signal pre-processing system have been integrated.

TUPS076

The Specification Process for the Large Scale Accelerator Project FAIR

alignment, survey, antiproton, target

1713

U. Weinrich
GSI, Darmstadt, Germany

The project FAIR is a large scale international accelerator facility with a high complexity within the accelerator complex. The project is owned by the recently founded FAIR GmbH while the physical-technical layout of the accelerator part of the facility is under the responsibility of GSI. This is the so-called two company model. Most of the accelerator subsystems and components are foreseen to be delivered In-Kind by accelerator institutes from Europe and Asia. In addition direct procurement is foreseen for those components not covered by in-kind-contributions or being very critical in time. Furthermore procurement has already started of components covered by special agreements and funding.

TUPS082

The LEBT Chopper for the Spiral 2 Project

ion, vacuum, high-voltage, target

1731

A.C. Caruso, F. Consoli, G. Gallo, D. Rifuggiato, E. Zappalà
INFN/LNS, Catania, Italy
M. Di Giacomo
GANIL, Caen, France
A. Longhitano
ALTEK, San Gregorio (CATANIA), Italy

The Spiral 2 driver uses a slow chopper situated in the common section of the low energy beam transport line to change the beam intensity, to cut off the beam in case of critical loss and to avoid hitting the wheel structure of rotating targets. The device has to work up to 10 kV, 1 kHz repetition frequency rate and its design is based on standard power circuits, custom alarm board and vacuum feed-through. The paper summarizes the design principles and describes the test results of the final device which has been installed on the beam line test bench.

TUPS084

Development Status of PPS, MPS and TS for IFMIF/EVEDA Prototype Accelerator

radiation, status, beam-losses, monitoring

1734

H. Takahashi, T. Kojima, T. Narita, K. Nishiyama, H. Sakaki, K. Tsutsumi
JAEA, Aomori, Japan

Control System for IFMIF/EVEDA* prototype accelerator consists of six subsystems; Central Control System (CCS), Local Area Network (LAN), Personnel Protection System (PPS), Machine Protection System (MPS), Timing System (TS) and Local Control System (LCS). The IFMIF/EVEDA prototype accelerator provides deuteron beam with the power more than 1 MW, which is as same as that in cases of J-PARC and SNS. Then, the PPS is required to protect technical and engineering staff against unnecessary exposure and the other danger phenomena. The MPS and the TS are strongly required a high performance and precision to avoid radio-activation of the accelerator components. To realize these requirements, the PPS designed that Programmable Logic Controllers (PLCs) are used mainly, and a sequence is programmed for entering and leaving of controlled area and etc. Hardware and logic sequences for the MPS are designed to realize the beam inhibition time within 30 micro-seconds. The TS prototype modules were designed and tested using 10 MHz master clock and 100 Hz reference trigger. This article presents the PPS, MPS and TS design in details.
* International Fusion Material Irradiation Facility / Engineering Validation and Engineering Design Activity

TUPS089

HI-13 Tandem Accelerator Radiation Protection System

radiation, tandem-accelerator, monitoring, status

1749

X.F. Wang, Y.M. Hu
CIAE, Beijing, People's Republic of China

In HI-13 Tandem Accelerator laboratory, a new radiation protection system has been built Which composed of 7 protective door control units and 7 emergency alarms , 23 groups of indicators,17 groups of workshop-empty units , L.E and IMAG Faraday cups as well as computer control and display system . Pre-empty process is prerequisite before close the protective doors to ensure nobody be exposed on irradiation environment otherwise the door-open would be disabled. Even thought somebody left, pushing nearby alarm button and emergency door-open button will induce glittery signal and simultaneous door-openning. L.E and IMAG Faraday cups execute immediate beam interruption once accidence occured . The distributed indicators indicate real time status of all the work fields. All above devices and units are interlocked follow some complex but logical protective rules. Computer workstation is built and accordingly, after full information and operation action signals are collected and transferred, the software can complete full-sides status monitoring, provide convenient control and display interfaces as well as pop adequate prompt frames.

TUPS098

Machining and Characterizing X-band RF-structures for CLIC

cavity, damping, collider, electron

1768

S. Atieh, M. Aicheler, G. Arnau-Izquierdo, A. Cherif, L. Deparis, D. Glaude, L. Remandet, G. Riddone, M. Scheubel
CERN, Geneva, Switzerland
D. Gudkov, A. Samoshkin, A. Solodko
JINR, Dubna, Moscow Region, Russia

The Compact Linear Collider (CLIC) is currently under study at CERN as a potential multi-TeV e+e collider. The manufacturing and assembling tolerances for making the required RF components are essential for CLIC to perform efficiently. Machining techniques are relevant to the construction of ultra-high-precision parts for the Accelerating Structures (AS). Optical-quality turning and ultra-precision milling using diamond tools are the main manufacturing techniques identified to produce ultra-high shape accuracy parts. A shape error of less than 5 micrometres and roughness of Ra 0.025 are achieved. Scanning Electron Microscopy (SEM) observation as well as sub-micron precision Coordinate Measuring Machines (CMM), roughness measurements and their crucial environment were implemented at CERN for quality assurance and further development. This paper focuses on the enhancements of precision machining and characterizing the fabrication of AS parts.

TUPS100

Manufacturing the Linac4 PI-mode Structure Prototype at CERN

cavity, linac, vacuum, alignment

1774

G. Favre, A. Cherif, A. Dallocchio, J.-M. Geisser, L. Gentini, F. Gerigk, S.J. Mathot, M. Polini, S. Sgobba, T. Tardy, R. Wegner
CERN, Geneva, Switzerland

The PI-Mode Structure (PIMS) of Linac4 consists of 7-cell cavities made from alternating OFE copper discs and rings welded together with electron beam (EB) welding. A full-scale prototype cavity of almost 1.5 m in length has been manufactured, assembled, and tested at CERN to prepare the series production of 12 PIMS cavities as part of an international collaboration. This paper reports on the construction experience including machining operations, EB welding, vacuum brazing, and metrological measurements results.

TUPS101

A Fast 650V Chopper Driver

linac, impedance, status, kicker

1777

M.M. Paoluzzi
CERN, Geneva, Switzerland

In the framework of Linac4 and the Superconducting Proton Linac (SPL) studies at CERN, the design for a beam chopper has been carried out. The chopper is basically a kicker that deviates part of the beam towards a dump. It is made of two 50 Ω, slow wave lines facing each other, matching the beam velocity and driven with a minimum of 500 V. Due to the bunch spacing of 2.84 ns, a system rise and fall time (3 %-90 %) below 2.5 ns is required with pulse lengths ranging from 8 ns to hundreds of μs. Although different solutions for the driver amplifier where devised in the past, none of the achievements was entirely satisfactory. This paper describes a new design and prototype that meets all the required specifications.

TUPS102

Design of an FPGA-based Radiation Tolerant Agent for WorldFIP Fieldbus

radiation, target, simulation, status

1780

G. Penacoba Fernandez, P. Alvarez, E. Gousiou, S.T. Page, J.P. Palluel, J. Serrano, E. Van der Bij
CERN, Geneva, Switzerland

CERN makes extensive use of the WorldFIP field-bus interface in the LHC and other accelerators in the pre-injectors chain. Following the decision of the provider of the components to stop the developments in this field and foreseeing the potential problems in the subsequent support, CERN decided to purchase the design information of these components and in-source the future developments using this technology. The first in-house design concerns a replacement for the MicroFIP chip whose last version was manufactured in an IC feature size found to be more vulnerable to radiation of high energy particles than the previous versions. NanoFIP is a CERN design based on a Flash FPGA implementing a subset of the functionality allowed by the communication standard, fitting the requirements of the different users and including the robustness against radiation as a design constraint. The development presented involved several groups at CERN working together in the framework of the Open Hardware Repository collaboration, and aiming at maximizing the interoperability and reliability of the final product.

TUPZ019

Transverse Emittance Preservation through the LHC Cycle

emittance, injection, luminosity, extraction

1843

V. Kain, B. Goddard, B.J. Holzer, J.M. Jowett, M. Meddahi, T. Mertens, F. Roncarolo
CERN, Geneva, Switzerland

The preservation of the transverse emittance is crucial for luminosity performance. At the LHC design stage the total allowed emittance increase was set to 7% throughout the LHC cycle. The proton run in 2010 showed that the injectors can provide beams with smaller emittances than nominal and higher bunch intensities. The LHC parameters are well under control and the emittances are kept below nominal until physics. The LHC luminosity goals for the first year of running could therefore be achieved with fewer bunches than initially foreseen. This paper will report on the measured emittance growth at injection from the SPS and the evolution of the emittance through the entire LHC cycle. Sources and possible cures for the observed emittance growth will be discussed.

TUPZ022

Longitudinal Beam Measurements at the LHC: The LHC Beam Quality Monitor

injection, pick-up, emittance, damping

1852

G. Papotti, T. Bohl, F. Follin, U. Wehrle
CERN, Geneva, Switzerland

The LHC Beam Quality Monitor is a system that measures individual bunch lengths and positions, similarly to the twin system SPS Beam Quality Monitor, from which it was derived. The pattern verification that the system provides is vital during the injection process to verify the correctness of the injected pattern, while the bunch length measurement is fedback to control the longitudinal emittance blow up performed during the energy ramp. In 2010 the system could for example clearly detect instances of longitudinal instabilities and beam excitation due to excess RF noise. The algorithms used, the hardware implementation and the system integration in the LHC control infrastructure are presented in this paper, along with possible improvements.

TUPZ025

Experience with Offset Collisions in the LHC

luminosity, target, emittance, beam-losses

1858

G. Papotti, R. Alemany-Fernandez, F. Follin, R. Giachino, W. Herr, T. Pieloni, M. Schaumann
CERN, Geneva, Switzerland
R. Calaga, R. Miyamoto
BNL, Upton, Long Island, New York, USA

To keep the luminosity under control, some experiments require the adjustment of the luminosity during a fill, so-called luminosity leveling. One option is the separate the beams transversely and adjust the separation to the desired collision rate. The results from controlled experiments are reported and interpreted. The feasibility of this method for ultimate luminosities is discussed.

TUPZ028

Beam Based Optimization of the Squeeze at the LHC

feedback, optics, beam-losses, simulation

1867

X. Buffat
EPFL, Lausanne, Switzerland
M. Lamont, S. Redaelli, J. Wenninger
CERN, Geneva, Switzerland

The betatron squeeze is a critical operational phase for the LHC because it is carried out at top energy, with the maximum stored energy and with reduced aperture margins in the superconducting triplets. A stable operation with minimum beam losses must be achieved in order to ensure a safe and efficient operation. The operational experience at the LHC showed that this is possible. The operation in 2010 is reviewed. In particular, orbit, tune and chromaticity measurements are investigated and correlated to beam losses. Different optimizations are then proposed towards a more efficient and robust operation. The improvements obtained for the operation in 2011 are presented.

TUPZ030

Simulation of Linear Beam Parameters to Minimize the Duration of the Squeeze at the LHC

optics, simulation, collider, acceleration

1873

X. Buffat
EPFL, Lausanne, Switzerland
G.J. Müller, S. Redaelli, M. Strzelczyk
CERN, Geneva, Switzerland

The betatron squeeze allows to increase the luminosity of a collider by reducing the β function at the interaction points. This operation has shown to be very critical in previous colliders. In this state of mind, the squeezing was performed extremely safely during the first year of operation of the Large Hadron Collider, at the expense of the duration of the process. As the turnaround time is a relevant parameter for the integrated luminosity, a squeeze of shorter duration is proposed for 2011 and further. MadX simulation of linear beam parameters based on settings extracted from the LHC control system are used to justify the proposal. Further optimization of the squeeze setting generation is also discussed.

TUPZ035

RHIC Polarized Proton Status and Operation Highlights

polarization, resonance, feedback, emittance

1888

H. Huang, L. A. Ahrens, I.G. Alekseev, E.C. Aschenauer, G. Atoian, M. Bai, A. Bazilevsky, M. Blaskiewicz, J.M. Brennan, K.A. Brown, D. Bruno, A. Dion, K.A. Drees, W. Fischer, J.W. Glenn, X. Gu, L.T. Hoff, C. Liu, Y. Luo, W.W. MacKay, Y. Makdisi, G.J. Marr, A. Marusic, F. Méot, M.G. Minty, C. Montag, J. Morris, A. Poblaguev, V. Ptitsyn, G. Robert-Demolaize, T. Roser, W.B. Schmidke, V. Schoefer, D. Smirnov, S. Tepikian, J.E. Tuozzolo, G. Wang, K. Yip, A. Zaltsman, A. Zelenski, S.Y. Zhang
BNL, Upton, Long Island, New York, USA
D. Svirida
ITEP, Moscow, Russia

RHIC operation as the polarized proton collider presents unique challenges since both luminosity and spin polarization are important. A lot of upgrades and modifications have been made since last polarized proton operation. A 9 MHz rf system has been installed to improve longitudinal match at injection and to increase luminosity. A vertical survey of RHIC was performed before the run to get better magnet alignment. The orbit control has also been improved this year. AGS polarization transfer efficiency is improved by a horizontal tune jump system. To preserve polarization on the ramp, a new working point was chosen with the vertical tune near a third order resonance. The orbit and tune control are essential for polarization preservation. To calibrate the polarization level at 250 GeV, polarized protons were accelerated up to 250GeV and decelerated back to 100GeV. The tune, orbit and chromaticity feedback is essential for this operation. The new record of luminosity was achieved with higher polarization at 250 GeV in this run. The overview of the changes and operation results are presented in this paper.

WEIB01

Chasing Femtoseconds – How Accelerators Can Benefit from Economies of Scale in Other Industries

laser, optics, scattering, polarization

1973

M. Vidmar, J. Tratnik
University of Ljubljana, Faculty of Electrical Engineering, Ljubljana, Slovenia
P.L. Lemut
COBIK, Solkan, Slovenia

Building accelerators we frequently push the limits of what is possible in terms of performance. When trying to solve a very challenging engineering problem, we normally resort to specialization; we narrow our focus. This talk suggests a possible alternative path. Huge benefits and great results can be achieved by combining creative ideas and approaches with ideas and solutions borrowed from the economies of scale like telecommunications. The aim of the talk is to show possibilities for combining ideas, technologies and components from different industries into innovative products.

Slides WEIB01 [0.799 MB]

WEIB02

Towards Developing Accelerators in Half the Time

feedback, alignment, target, background

1978

D.G. Reinertsen
Reinertsen & Associates, Redondo Beach, California, USA

The talk challenges conventional wisdom about how to improve product development processes and broadens the concept of product development cycle time reduction techniques. It provides some original ideas; it discusses approaches to managing product architecture that are well suited for rapid development and how the engineering concepts of system architecture, queuing theory, feedback theory, and information theory can be applied to manage the product development management.

Slides WEIB02 [0.159 MB]

WEIB03

Emerging New Electronics Standards for Physics

instrumentation, status, monitoring, diagnostics

1981

R.S. Larsen
SLAC, Menlo Park, California, USA

Funding: Work supported by US Department of Energy Contract DE AC03 76SF00515.
A unique effort is underway between industry and the international physics community to extend the Telecom industry’s Advanced Telecommunications Computing Architecture (ATCA and MicroTCA) to meet future needs of the physics machine and detector community. New standard extensions for physics are being designed to deliver unprecedented performance and high subsystem availability for accelerator controls, instrumentation and data acquisition. A key feature is a unique out-of-band imbedded standard Intelligent Platform Management Interface (IPMI) system to manage hot-swap module replacement and hardware-software failover. An additional goal is to achieve a much higher degree of interoperability of both lab and industry designed hardware-software products than past generations of standards. This presentation will describe status of the hardware-software standards extension plans; technology advantages for machine controls and data acquisition systems; and examples of collaborative efforts to help develop an industry base of generic ATCA and MicroTCA products in an open-source environment.

Slides WEIB03 [3.905 MB]

WEPC003

Low-Beta Empirical Models used in Online Modeling and High Level Applications

space-charge, cavity, solenoid, simulation

2001

Y.-C. Chao, G. Goh
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada

Using empirically models for elements generated by simulations codes such as Astra in low-beta beamline to provide efficient and more accurate models for machine diagnostic and tuning is discussed. Experience of such application in the framework of XAL may also be presented.

WEPC007

Large Energy Acceptance Dogleg for the European XFEL Injector

sextupole, focusing, quadrupole, linac

2013

N. Golubeva, V. Balandin, W. Decking
DESY, Hamburg, Germany

The option to install two injectors is foreseen at the European XFEL Facility. The injectors will be located on top of each other in the same building, both with the offset of 2.75 m with respect to the main linac axis. The translation system (dogleg) from the injector axis to the main linac axis has to fulfill very tight requirements of the chromatic properties, because the energy chirp required for the downstream bunch length compression in magnetic chicanes will be created upstream in the injector linac. In this paper we present such an large energy acceptance dogleg and discuss the optical symmetries which form the basis of its design.

WEPC034

High-level Application Programs for the TPS Commissioning and Operation at NSRRC

quadrupole, storage-ring, target, EPICS

2079

F.H. Tseng, H.-P. Chang, C.C. Chiang
NSRRC, Hsinchu, Taiwan

For the Taiwan Photon Source (TPS) commissioning and operation we have developed more MATLAB-based application programs and tested them on the Taiwan Light Source (TLS). These additional applications built with the MATLAB Middle Layer (MML) include beta function measurement, dispersion function measurement, chromaticity measurement, chromaticity correction, and tune control. In this paper, we will illustrate what algorithms we use in these applications and show the test results. Especially, in order to get the first beam in the TPS commissioning, we adopt the RESOLVE algorithm for the beam steering and it has been built successfully in UNIX-like systems such as Mac OSX and different Linux versions. It can provide us some exercises of error finding and correction before the TPS commissioning in 2013.

WEPC091

Studies with a Particle Tracking Code for the SIS100 Resonant Extraction System

extraction, quadrupole, synchrotron, feedback

2220

M.M. Kirk, G. Franchetti, H. Klingbeil, P. Moritz, N. Pyka, H. Ramakers, P.J. Spiller, H. Welker
GSI, Darmstadt, Germany

Several issues concerning the envisaged SIS100 resonant extraction at GSI can be resolved with a simulation-lead approach for which a particle tracking code was developed. Applications to date have included: design and testing of data supply algorithms for the accelerator control system; requirements analysis for the power converter ripple in the quadrupoles forming the doublet focusing; and verification of the RF Knock-Out exciter's performance.

WEPC115

A Global Optimization Approach Based on Symbolic Presentation of a Beam Propagator

booster, focusing, quadrupole, induction

2280

S.N. Andrianov, A.N. Ivanov, M. Kosovtsov, E.A. Podzyvalov
St. Petersburg State University, St. Petersburg, Russia

It is known that modern systems of beam lines consist of huge control elements even in the case of small machines. The problem of the beam line design leads us to formulate this problem as a global optimization ones. This approach allows us defining a family of appropriate solutions. On the next steps a researcher should narrow this optimal solutions set using additional methods and concepts. The symbolic presentation of necessary information plays leading role on all steps of the suggested approach. The corresponding implementation presented in the paper allows us to find the optimal sets in parameters spaces in a proper way. The corresponding applied software was used for solution of some practical probems. The described ideology implies to use distributed and parallel technologies for necessary computing and will be integrated in the Virtual Accelerator concept.

WEPC116

A Matrix Presentation for a Beam Propagator including Particles Spin

collider, storage-ring, heavy-ion, scattering

2283

M. Kosovtsov, S.N. Andrianov, A.N. Ivanov
St. Petersburg State University, St. Petersburg, Russia

Particles beam dynamics in magnetic and electrical fields with spin is discussed. This approach provides a constructive method of matrix presentation derivation for a beam propagator in magnetic and electrical fields. The beam propagator is evaluated in according to the well-known Lie algebraic tools. But in contrast to traditional approaches matrix presentation for Lie propagators bases on two-indexes matrices. This approach permit to apply all of matrix algebra opportunities and advantages in contrast with the tenzor presentation based on multi-indexes description. The necessary computation can be realized in symbolic (using computer algebra codes as Mathematica, Maple, Maxima and so on). The corresponding symbolic objects itself can be stored in special databases and used then in numerical computing. Parallel and distributed conception is well acceptable with the suggested matrix formalism. Some symbolic and numerical results are discussed for problems of long term evolution of particles with spin.

WEPC117

Symmetry Based Design for Beam Lines*

quadrupole, target, insertion, beam-transport

2286

S.N. Andrianov, A.N. Ivanov, M. Kosovtsov
St. Petersburg State University, St. Petersburg, Russia

Usually, the beam line design problems are solved using numerical optimization methods (for example, in the frame of so called global optimization paradigm). But this approach demonstrates enough effectiveness only after sufficient reduction of a control parameters set. In this paper we present the symmetry design concept based on symbolic computations for the corresponding beam line propagator. The combination of symbolic algebra codes (such as Maple, Mathematica, Maxima and so on) with the matrix formalism for Lie algebraic tools enables us to carry out the entire theoretical and computing processes for design of the beam line under study. For this purpose some of necessary physical requirements are formulated in the terms of the corresponding symmetry conditions. The suggested approach can be realized in both exact and approximate forms of the symmetry terms. The found conditions can sufficiently reduce the number of control parameters for the next optimization step.

WEPC120

Status of JMAD, the JAVA-API for MADX

optics, status, lattice, feedback

2292

K. Fuchsberger, X. Buffat, Y.I. Levinsen, G.J. Müller
CERN, Geneva, Switzerland

MADX (Methodical Accelerator Design) is the de-facto standard software for modeling accelerator lattices at CERN. This feature-rich software package is implemented and still maintained in the programming languages C and FORTRAN. Nevertheless the controls environment of modern accelerators at CERN, e.g., of the LHC, is dominated by JAVA applications. A lot of these applications, for example, for lattice measurement and fitting, require a close interaction with the numerical models, which are all defined by the use of the proprietary MADX scripting language. To close this gap an API to MADX for the JAVA programming language (JMAD) was developed. JMAD was first presented to the public about one year ago. In the meantime, a number of improvements were done, and additional MADX features (e.g., tracking) were made available for JAVA applications. Additionally, the graphical user interface was improved, and the first release as open source software is in reach. This paper describes the current status and some new features of the project, as well as some usage examples.

WEPC121

XML Constructs for Developing Dynamics Applications or Towards a Universal Representation of Particle Accelerators in XML

EPICS, extraction, lattice, diagnostics

2295

J.T.M. Chrin, R.A. Krempaska, H. Lutz, G. Prekas
PSI, Villigen, Switzerland
T.A. Pelaia
ORNL, Oak Ridge, Tennessee, USA

A recognized practice within the development of high-level beam dynamics applications is to separate data parameters destined for the configuration of the application from the programming language domain. The contemporary approach is to generate input files that provide the configuration parameters in a structured data format specified by the Extensible Markup Language (XML), enhancing flexibility and simplifying code maintenance. Furthermore, a careful choice of syntactic constructs, i.e. structured elements, attributes, etc., that map well to the various accelerator components, provides a basis for portability of applications. This has been exemplified by the XAL software package which initiated an XML description of the Standard Machine Format (SMF) accelerator object model. We have since adopted XML-SMF to provide an XML representation of both the Swiss Light Source (SLS) and the SwissFEL Injector Test Facility. We demonstrate how such XML constructs allow us to deploy the same orbit display application at both facilities. Our experience leads us to advocate a Universal Machine Format (UMF) that encompasses an all-inclusive XML schema for the management of accelerator information.

Poster WEPC121 [0.313 MB]

WEPC134

Unified Accelerator Modeling Using the Bmad Software Library

simulation, lattice, photon, linac

2310

D. Sagan, I.V. Bazarov, J.Y. Chee, J.A. Crittenden, G. Dugan, K. Finkelstein, G.H. Hoffstaetter, C.E. Mayes, S. Milashuk, D. L. Rubin, J.P. Shanks
CLASSE, Ithaca, New York, USA
R. Cope
CSU, Fort Collins, Colorado, USA

Funding: Work supported by the National Science Foundation and by the US Department of Energy under contract numbers PHY-0734867 and DE-FC02-08ER41538.
The Bmad software library has proved to be a useful tool for accelerator simulations owing to its modular, object-oriented design. It is now used in a number of design, simulation and control programs at the Cornell Laboratory for Accelerator-based Sciences and Education. Work is ongoing to expand Bmad in a number of directions. One aim is tohave a complete framework in order to simulate Cornell's Energy Recovery Linac from Gun cathode (including space-charge) to photon generation to photon tracking through to the x-ray experimental end stations. Other work includes synchrotron radiation tracking including reflections from the vacuum chamber walls which is useful for electron cloud investigations, spin tracking, beam break-up instability, intra-beam scattering, etc. This paper will discuss the current state of the Bmad software along with the long-term goals.

WEPC142

High Performance Web Applications for Particle Accelerator Control Systems

luminosity, collider, optics, diagnostics

2322

G. Mazzitelli, C. Bisegni, P. Ciuffetti, G. Di Pirro, A. Stecchi
INFN/LNF, Frascati (Roma), Italy
S. Calabrò, L.G. Foggetta
IN2P3-CNRS, Orsay, France
L. Catani, F. Zani
INFN-Roma II, Roma, Italy

The integration of web technologies and applications has been one of the major trends for the development of new services for control systems of particle accelerators and large experimental apparatuses. Nowadays, high performance web technologies exhibit some features that would allow their deeper integration in a control system and their employment in developing control system's core components. In this paper we discuss the results of preliminary investigations of a new paradigm for a particle accelerator control system and associated machine data acquisition system based on a synergic combination of network distributed cache memory and a non-relational key/value database. Storage speed, network memory data retrieve throughput and database queries execution, as well as scalability and redundancy of the systems, are presented and critically reviewed.

Poster WEPC142 [8.902 MB]

WEPC143

First Operation of the SACLA Control System in SPring-8

electron, laser, monitoring, status

2325

R. Tanaka, Y. Furukawa, T. Hirono, M. Ishii, M. Kago, A. Kiyomichi, T. Masuda, T. Matsumoto, T. Matsushita, T. Ohata, C. Saji, T. Sugimoto, M. Yamaga, A. Yamashita
JASRI/SPring-8, Hyogo-ken, Japan
T. Fukui, T. Hatsui, N. Hosoda, T. Ohshima, T. Otake, Y. Otake, H. Takebe
RIKEN/SPring-8, Hyogo, Japan
H. Maesaka
RIKEN Spring-8 Harima, Hyogo, Japan

The control system design of the X-ray free electron laser facility (SACLA) in SPring-8 has started in 2006. Now, the facility has completed to start beam commissioning in February 2011. The electron beams were successfully accelerated up to 8 GeV and the first SASE X-ray was observed. The control system adopts the 3-tier standard model by using MADOCA framework developed in SPring-8. The upper control layer consists of Linux PCs for operator consoles, Sybase RDBMS for data logging and FC-based NAS for NFS. The lower layer consists of VMEbus systems with off-the-shelf I/O boards and specially developed boards for RF waveform processing with high precision. Solaris OS is adopted to operate VMEbus CPU. The PLC is used for slow control and connected to the VME systems via FL-net. The Device-net is adopted for frontend device control to reduce the number of signal cables. Some of VMEbus systems have a beam-synchronized data-taking system to meet 60Hz electron beam operation for the beam tuning diagnostics. The accelerator control system has gateways not only to monitor device status but also control the tuning points of the facility utility system, especially cooling water.

WEPC145

Progress in Developing a PLC Control System for the PKUNIFTY

pick-up, rfq, cavity, neutron

2331

J. Zhao, J.E. Chen, Z.Y. Guo, Y.R. Lu, S.X. Peng, Q.F. Zhou
PKU/IHIP, Beijing, People's Republic of China

A compact remote PLC control system has been developed for the PKUNIFTY (Peking University Neutron Imaging FaciliTY). That facility is based on a 2 MeV deuteron RFQ accelerator. The PLC control system has been successfully used for the injector including ECR ion source and LEBT, and it worked reliably last year. Now the control of RFQ cavity, HEBT and Be target has been completed and tested. The interlock system has been enhanced. A low level RF control system, including the auto frequency control (AFC) and auto gain control (AGC) circuits, has been designed for the RFQ’s RF power system. Those circuits will work as a lower controller of the PLC control system. The main running parameters can be controlled by setting any desired range of values on the HMI. Test results of hardware and software are presented.

WEPC146

Design and Implementation of Distributed Control System for PEFP 100-MeV Proton Accelerator*

EPICS, proton, monitoring, vacuum

2334

Y.-G. Song, Y.-S. Cho, J.-H. Jang, H.-J. Kwon
KAERI, Daejon, Republic of Korea

Funding: This work is supported by the Ministry of Education, Science and Technology of the Korean Government.
The Proton Engineering Frontier Project (PEFP) has been developing the control system for 100-MeV proton accelerator. The PEFP control system should be designed to fit control conditions based on networked and distributed real-time system composed of several sub-systems such as machine control, diagnostic control, timing, and interlock. In order to implement the distributed control system, the Experimental Physics and Industrial Control System (EPICS) has been chosen as the middleware of PEFP control system. The EPICS software provides a distributed architecture that supports a wide range of solution such as independent programming tool, operator interface tool, database and web-based archiving tools. In this paper, we will present the details of the design and implementation issues of the PEFP control system.

WEPC152

Android Based Mobile Monitoring System for EPICS Networks: Vacuum System Application*

EPICS, monitoring, vacuum, ion-source

2337

I. Badillo, I. Arredondo, M. Eguiraun, J. Feuchtwanger, G. Harper
ESS-Bilbao, Zamudio, Spain
J. Jugo
University of the Basque Country, Faculty of Science and Technology, Bilbao, Spain

Funding: The present work is supported by the Basque Government and Spanish Ministry of Science and Innovation.
When cabling is not really needed for performance reasons, wireless monitoring is a good choice for large scientific facilities like particle accelerators, due to the quick implementation. There are several wireless flavors: ZigBee, WiFi etc. depending on requirements of specific application. In this work, a wireless monitoring system for EPICS based on an Android device is presented. The task is to monitor the vacuum control system of ISHN project at ESSBilbao, where control system variables are acquired over the network and published in a mobile device. This allows the operator to check process variables everywhere the signal spreads. In this approach, a Python based server is continuously getting EPICS variables via CA protocol and sending them through a WiFi network using ICE middleware, a toolkit oriented to develop distributed applications. Finally, the mobile device reads and shows the data to the operator. The security of the communication is ensured by a limited WiFi signal spread, following the same idea as in NFC for larger distances. With this approach, local monitoring and control applications are easily implemented, useful in starting up and maintenance stages.

WEPC153

ISHN Ion Source Control System Overview and Future Developments

power-supply, ion, ion-source, plasma

2340

M. Eguiraun, I. Arredondo, J. Feuchtwanger, G. Harper, M. del Campo
ESS-Bilbao, Zamudio, Spain
J. Jugo
University of the Basque Country, Faculty of Science and Technology, Bilbao, Spain
S. Varnasseri
ESS Bilbao, Derio, Spain

Funding: The present work is supported by the Basque Government and Spanish Ministry of Science and Innovation.
ISHN project consist on a Penning ion source which will deliver up to 65 mA of H⁻ beam pulsed at 50 Hz with a diagnostics vessel for beam testing purposes. The present work summarizes the control system of this research facility, and presents its future developments. ISHN consist of several power supplies for plasma generation and beam extraction, including auxiliary equipment and several diagnostics elements. The control system implemented with LabVIEW is based on PXI systems from National Instruments, using two PXI chassis connected through a dedicated fiber optic link between HV platform and ground. Source operation is managed by a real time processor, while additional tasks are performed by means of an FPGA. In addition, the control system uses a MySQL database for data logging, by means of a LabVIEW application connected to such DB. The integration of EPICS into the control system by deploying a Channel Access Server is the ongoing work, several alternatives are being tested. Finally, a high resolution synchronization system has been designed, for generating timing for triggers of plasma generation and extraction as well as data acquisition for beam diagnostics.

WEPC154

EPICS HyperArchiver: initial tests at ESSBilbao

EPICS, insertion, ion-source, ion

2343

M. del Campo
ESS-Bilbao, Zamudio, Spain
M.G. Giacchini, L.G. Giovannini
INFN/LNL, Legnaro (PD), Italy
J. Jugo
University of the Basque Country, Faculty of Science and Technology, Bilbao, Spain

Funding: The present work is supported by the Basque Government and Spanish Ministry of Science and Innovation.
The aim of this work is to present the results obtained after different tests performed regarding data storage for an Ion Source, by means of an EPICS control system at ESS-Bilbao (Spain). As a first approach, data was recorded on a MySQL database, using a traditional EPICS RDB Channel Archiver instance, maintained at ORNL SNS (USA). Nevertheless, initial results shown the need of an evolution towards a high performance scalable database. Therefore, current tests are focused on the customization and usage of a HyperArchiver instance, developed at INFN/LNL (Italy), which uses Hypertable as its main database. Hypertable is a distributed, high performance non relational database, released under GNU licence and focused on data-intensive tasks. At ESS Bilbao, a slightly modified version of the HyperArchiver was used, due to the necessity of an improvement on the management of array PVs. Regarding data retrieval and visualization, a python GUI developed at ESS-Bilbao was used, in opposition to the traditional CSS data browser, trying to make data retrieval as fast and simple as possible. Hypertable is presented as a high performance alternative to MySQL for any EPICS control system.

WEPC155

Fast Acquisition Multipurpose Controller with EPICS Integration and Data Logging

EPICS, status, LLRF

2346

I. Arredondo, D. Belver, P. Echevarria, H. Hassanzadegan, M. del Campo
ESS-Bilbao, Zamudio, Spain
V. Etxebarria, J. Jugo
University of the Basque Country, Faculty of Science and Technology, Bilbao, Spain
N. Garmendia, L. Muguira
ESS Bilbao, Bilbao, Spain

Funding: Funding Agency The present work is supported by the Basque Government and Spanish Ministry of Science and Innovation.
This work introduces a fast acquisition multipurpose controller (MC), based on a XML configuration with EPICS integration and Data Logging. The main hardware is an FPGA based board, connected to a Host PC. This Host computer acts as the local controller and implements an IOC, integrating the device into an EPICS network. Java has been used as the main programming language in order to make the device fit the desired application. The whole process includes the use of different technologies: JNA to handle FPGA API, JavaIOC to integrate EPICS and XML w3c DOM classes to configure each particular application. Furthermore, a MySQL database is used for data storage, together with the deployment of an EPICS ArchiveEngine instance, offering the possibility to record data from both, the ArchiveEngine and a specifically designed Java library. The developed Java specific tools include different methods: FPGA management, creation and use of EPICS server, mathematical data processing, Archive Engine's MySQL database connection and creation/initialization of the application structure by means of an XML file. This MC has been used to implement a BPM and an LLRF applications for ESS-Bilbao.

WEPC156

Virtual Power Supply Control Environment for the TPS Project

power-supply, EPICS, quadrupole, storage-ring

2349

Y.-S. Cheng, Y.-T. Chang, J. Chen, P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Kuo, C.-Y. Liao, C.Y. Wu
NSRRC, Hsinchu, Taiwan

The Taiwan Photon Source (TPS) is the latest generation of 3 GeV synchrotron light source which has been under construction since 2010. The control system infrastructure of TPS project is based upon the EPICS framework. In order to develop the control applications before power supplies of magnets delivered, it is necessary to set up the virtual control environment to develop high level application programs for the power supplies of magnets in advance. The high level application programs include operation process, degauss process and etc. for power supplies of magnet. The soft-IOCs (Input Output Controller) and various database records are needed to be built to simulate the power supply control environment. In addition, the operation interfaces of power supply will be designed and integrated according to location properties. The efforts will be described at this report.

WEPC157

Post-mortem Analysis at TLS

diagnostics, SRF, insertion, insertion-device

2352

Y.R. Pan, Y.-T. Chang, J. Chen, P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Kuo, C.-Y. Liao
NSRRC, Hsinchu, Taiwan

High availability and stability of the beam are important issues for the synchrotron light source. Analyzing of the post-mortem data is one of the most important approaches to reflect the machine error and identify the reason of beam trip. The post-mortem system has been developed at Taiwan Light Source (TLS) in 2008. This diagnostic data can provide useful information for troubleshooting and improve the beam reliability. The various diagnostic signals are read from hardware buffer and written to the file system by the post-mortem event trigger, which is generated by the signals of the beam trip detector, the superconducting RF system interlock and the superconducting insertion device interlock. In this report a processing is running to check whether a new trip event, promptly find out the unusual signals, and generate an analyzing result message. The detail will be discussed and summarized.

WEPC159

A Python Tracking Code and GUI for Control Room Operations

lattice, storage-ring, status, dipole

2358

M.T. Heron, J. Rowland
Diamond, Oxfordshire, United Kingdom

Considerable use has been made in recent years of accelerator physics modelling and online tools under Matlab. These have demonstrated the benefits of operating in a rich integrated environment and further given good portability across projects and operating systems. As a possible alternative to Matlab, Diamond has been evaluating options based on Python. Python together with the Numpy libraries and Qt Graphics provides an environment which offers a lot of the functionality of Matlab. This paper presents these developments, which include a tracking code, symplectic integrator, twiss and response matrix together with a GUI interface.

WEPC163

A New Embedded Radiation Monitor System for Dosimetry at the European XFEL

radiation, undulator, neutron, linac

2364

F. Schmidt-Föhre, D. Nölle, R. Susen, K. Wittenburg
DESY, Hamburg, Germany
L. Fröhlich
ELETTRA, Basovizza, Italy

The upcoming European XFEL will be built at a length of approx. 3.4 km between the campus of the Deutsches Elektronen-Synchrotron DESY at Hamburg and Schenefeld at Schleswig-Holstein for commissioning in 2015. The XFEL utilizes various electronic systems for machine control, diagnostics and safety. To achieve a cheap and compact accelerator construction, the beam pipe and its nearby electronic supply systems are located inside the same tunnel, charged by an evident amount of radiation in certain sections of the XFEL. To insure the lifecycle and function of electronics and magnetic structures like undulators in these XFEL radiation fields, all electronic systems located inside the tunnel will be sufficiently shielded according to pre-estimated radiation levels. In addition, these electronics and the undulator parts will be monitored for the impact of Gamma- and Neutron-radiation by a new versatile and compact radiation monitor system. It measures the accumulated dose in the electronic cabinets along the XFEL to ensure an exchange of radiated parts before significant radiation damage occurs. First prototype measurements at different radiation sources will be presented.

WEPC168

Implementation of a Workflow Model to Store and Analyze Measured Data at the ESS-Bilbao Ion Source Test Stand

ion, ion-source, diagnostics, emittance

2376

Z. Izaola, M. Eguiraun, M. del Campo
ESS-Bilbao, Zamudio, Spain
I. Bustinduy
ESS Bilbao, Bilbao, Spain

Funding: The present work is supported by the Basque Government and Spanish Ministry of Science and Innovation.
In order to fully characterize the experimentally measured beam in any accelerator facility, both diagnostics measurements and operating parameters need to be stored and correlated. Generating thus, a substantial amount of data. To address this problem in the ESS-Bilbao Ion Source Test Stand (ITUR), we have developed a software toolkit. This software stores Pepperpot, Faraday-Cup, Retarding Potential Analyzer, ACCT and DCCT measurements in a relational database associated with the operating parameter values at the time of measurement. Furthermore, the toolkit stores in the same database the beam transverse dynamics parameters processed from the pepperpot device. This allows to connect easily the beam physics with the accelerator running parameters. MySQL has been used as database backend and Matlab as programming language.

WEPO026

Advances in the Design of the SuperB Final Doublet

quadrupole, luminosity, collider, positron

2454

E. Paoloni, N. Carmignani, F. Pilo
University of Pisa and INFN, Pisa, Italy
S. Bettoni
CERN, Geneva, Switzerland
M.E. Biagini, P. Raimondi
INFN/LNF, Frascati (Roma), Italy
F. Bosi
INFN-Pisa, Pisa, Italy
P. Fabbricatore, S. Farinon, R. Musenich
INFN Genova, Genova, Italy
M.K. Sullivan
SLAC, Menlo Park, California, USA

SuperB is an asymmetric (6.7 GeV HER, 4.18 GeV LER) e⁺ e− collider operating at the Y(4S) peak with a design peak luminosity of 10³6 Hz/cm² to be built in Italy in the very near future. The design luminosity is almost a factor hundred higher than that of the present generation comparable facilities. To get the design luminosity a novel collision scheme, the so called “large Piwinski angle with crab waist”, has been designed. The scheme requires a short focus final doublet to reduce the vertical beta function down to betay*=0.2 mm at the interaction point (IP). The final doublet will be composed by a set of permanent and superconducting (SC) quadrupoles. The SC quadrupole doublets QD0/QF1 have to be placed as close to the IP as possible. This layout is critical because the space available for the doublets is very small. An advanced design of the quadrupole has been developed, based on the double helical coil concept. The paper discusses the design concept, the construction and the results of test of a model of the superconducting quadrupole based on NbTi technology. Future developments are also presented.

WEPS006

CNAO RF System: Hardware Description.

cavity, proton, resonance, impedance

2493

L. Falbo, G. Burato
CNAO Foundation, Milan, Italy
M.M. Paoluzzi, G. Primadei
CERN, Geneva, Switzerland

CNAO is the Italian National Center of Oncological Hadrontherapy in Pavia. Proton beams are accelerated in the synchrotron and extracted in the energy range 60 to 250 MeV/u and carbon ion beams in the energy range 120 to 400 MeV/u. Trapping at the injection energy of 7 MeV/u and acceleration up to the extraction energy are done by an RF cavity which covers the needed wide range of frequency (0.4 to 3 MHz) and voltage (25 V to 5 kV) thanks to the use of a Vitrovac amorphous alloy. RF Gymnastics, including phase jumps to increase the momentum spread and empty bucket channelling, is requested and has been performed. A description of the hardware characteristics of the CNAO RF system and of its performance in terms of dynamic and static behaviour are reported in this paper.

WEPS077

Present Status of FFAG Proton Accelerator at KURRI*

proton, neutron, ion, linac

2685

Y. Mori, Y. Ishi, Y. Kuriyama, J.-B. Lagrange, R. Nakano, T. Planche, T. Uesugi, E. Yamakawa
KURRI, Osaka, Japan
Y. Niwa, K. Okabe, I. Sakai
University of Fukui, Faculty of Engineering, Fukui, Japan

The 150MeV FFAG proton accelerator has been developed at Kyoto University Research Reactor Institute(KURRI) for the fundamental study of Accelerator Driven Sub-crittical Reactor (ADSR). Recently, a new H⁻ injector was constructed to improve the beam quality and intensity. The paper will describe the detail of the preset status of FFAG proton accelerator at KURRI.

THXA01

Recent Trends in Accelerator Control Systems

EPICS, LLRF, feedback, coupling

2844

I. Verstovšek, F. Amand, M. Pleško, K. Žagar
Cosylab, Ljubljana, Slovenia

The talk will discuss the approaches of different accelerators, such as FAIR, ESS, MedAustron, XFEL, etc. An overview of different approaches will be given with an emphasis of the recent spectrum of various realizations of accelerator control systems. The talk will not be limited to open source and off-the-shelf software frameworks only but will touch all trends in modern accelerators, including recent trends in hardware. The role of the control system will be highlighted as a common integration framework for various applications, with an emphasis on its increased complexity and scale, and the need for improved reliability and an appropriate service. How control systems can help support the requirements-shaping process early in the project will also be discussed.

Slides THXA01 [1.535 MB]

THOAA02

Implementation of an Intensity Feedback-loop for an Ion-therapy Synchrotron

feedback, extraction, ion, synchrotron

2851

C. Schömers, E. Feldmeier, Th. Haberer, J. Naumann, R.E. Panse, A. Peters
HIT, Heidelberg, Germany

The Heidelberg Ion Therapy-Centre (HIT) started treatment of tumour patients in 2009. Its main acceleration stage is a synchrotron, where particles are extracted slowly, in the time frame of some seconds, to support the raster-scanning method. The slow extraction is driven by the transverse "RF-nockout-exciter". So far, this device has a variable but predefined amplitude curve. As the phase-space distribution of particles is not homogeneous and varies slightly from pulse to pulse, intensity-fluctuations of the extracted beam appear. Moreover, changing accelerator-settings requires a time-consuming re-adjustment of the exciter to achieve adequate beam-properties again. To keep the intensity on a predefined level, a feedback loop will be implemented. The actual-value of the intensity is provided by an ionization chamber in front of the patient. The feedback loop controls the amplitude of the Exciter, to adapt the number of extracted particles. Beside a rectangular spill with constant intensity, a dynamic intensity-adaptation during one spill with respect to the particular treatment-plan will be investigated. First tests for flat spill and variable intensity showed promising results.

Slides THOAA02 [2.284 MB]

THOAB02

Metal Nano-particle Synthesis by using Proton Beam

proton, electron, radiation, cyclotron

2871

M.H. Jung, K. R. Kim, S.J. Ra
KAERI, Daejon, Republic of Korea

Funding: This work was conducted as a part of the Proton Engineering Frontier Project supported by the Ministry of Education Science & Technology of Korea Government.
Many scientists have studied metal nano-particles for newly known optical, electronic and chemical properties. The unique properties of nano-particles have a tendency to relate the particle size and shape. Electron beam have been used for the nano-particle synthesizing and many results were published. Study of nano-particles synthesize by using proton beam is still in the early stages however study for gold, silver, platinum and cobalt nano-particle was in progress. 100 MeV proton linear accelerator, which is by Proton Engineering Frontier Project, Korea Atomic Energy Research Institute, is scheduled to be completed by 2012. Study of nano-particle synthesize by using proton beam will become active due to the completion of 100 MeV proton accelerator and it can be mass-produced because of the large current beam. Finally, industrial applications could become possible. The mechanism of metal nano-particles synthesizing by proton beam irradiation was not completely known. In this study, we investigated the changes of size and shape for metal nano-particle depending on the condition of proton beam irradiation, and concentration of additives by TEM and UV/Vis spectrophotometer.

Slides THOAB02 [9.791 MB]

THPC017

Temporal and Spatial Alignment of Electron Bunches and Ultrashort Laser Pulses for the CHG Experiment at DELTA

laser, electron, undulator, synchrotron

2945

M. Zeinalzadeh, M. Bakr, H. Huck, M. Höner, S. Khan, R. Molo, A. Nowaczyk, A. Schick, P. Ungelenk
DELTA, Dortmund, Germany

Funding: Supported by DFG, BMBF, and the Federal State NRW
The generation of ultrashort VUV pulses by CHG (Coherent Harmonic Generation) requires achieving and maintaining the longitudinal and transversal overlap of femtosecond laser pulses and electron bunches. We present the techniques and the experimental setup applied at the DELTA storage ring. For the longitudinal analysis, both a streak camera and a fast photo diode are used. Transversely, two CCD cameras acquire images of laser and synchrotron light at different positions inside of the undulator. A feedback system utilizes the intensity of a THz signal generated several meters downstream of the undulator to optimize and maintain the overlap.

THPC027

Top-up Operational Experience at Elettra

storage-ring, injection, booster, radiation

2966

E. Karantzoulis, A. Carniel, S. Krecic
ELETTRA, Basovizza, Italy

Since May 2010 Elettra, the third generation Italian light source, operates regularly for users at both 2 and 2.4 GeV in top-up. In this paper the experience during more than a year of operation in top-up at both user energies is discussed and the machine up time statistics presented and compared with the before top up period.

THPC042

Status and Development of the SAGA Light Source

storage-ring, laser, undulator, linac

2996

T. Kaneyasu, Y. Iwasaki, S. Koda, Y. Takabayashi
SAGA, Tosu, Japan

The SAGA Light Source (SAGA-LS) is a synchrotron radiation facility consisting of a 255 MeV injector linac and a 1.4 GeV storage ring, and has been stably providing synchrotron light since 2006. The annual failure time is less than 1% of the user time in the recent two years. Three insertion devices are installed in the storage ring: an APPLE-II undulator, a planar type undulator (Saga Univ.) and a 4 T superconducting wiggler (SCW). The SCW contains a hybrid three-pole magnet; the main pole of the magnet is surrounded by superconducting coils while side poles are normal conducting magnets. The main pole of the SCW is cooled by a GM cryocooler, which allows the SCW be operated without liquid helium. Since the installation in March 2010, the SCW has been operated stably. To control the ID parameters during the user time, a feed-forward correction system which minimizes the ID effects on the emittance coupling was developed. The laser Compton Gamma-rays were generated by using a CO2 laser and were used for beam energy measurement. In addition, research works on the beam lifetime and interaction between electron beam and crystal, and development of a multipole magnet are in progress.

THPC043

Status of SESAME Project

booster, vacuum, EPICS, quadrupole

2999

A. Nadji
SESAME, Amman, Jordan

This paper reports on the progress which has been made on the construction of the SESAME accelerator complex. The construction of the shielding wall has been finished on March 2011. According to plan, the preparation works and tenders of the conventional facilities have been launched such as the cooling system, electrical distribution systems, PSS system and so on. The commissioning of the Microtron at full energy and the installation of the booster are the next millstones to accomplish. The booster upgrade plan has started which consists of replacing all bending magnets vacuum chamber with new one, BPM Libera Electronics, new control system based on EPICS, new timing system, new electronics for tune measurement. The site acceptance test of the new power supplies of the booster with their tracking electronics is planned to take place in July 2011. The magnet system of the storage ring has been reviewed and the manufacturing tendering is foreseen before the end of 2011.

THPC052

Progress Towards Top-up Operation at SSRF

injection, storage-ring, radiation, photon

3008

Z.T. Zhao, H.H. Li, L. Yin, W.Z. Zhang
SINAP, Shanghai, People's Republic of China

The Shanghai Synchrotron Radiation Facility (SSRF) has been in operation for user experiments in decay mode since May 2009. In the meantime various activities to prepare top-up operation at SSRF, including safety analysis and simulation, dedicated instrumentations and interlocks, control software, radiation measurements, injection optimization and top-up operation tests, have been carried out. In this paper, the progress towards top-up operation at SSRF is described together with its achieved performance.

THPC111

Operation of an L-band RF Gun with Pulses Inside the Burst Mode RF Pulse

gun, cavity, laser, klystron

3146

V. Vogel, V. Ayvazyan, B. Faatz, K. Flöttmann, D. Lipka, P. Morozov, H. Schlarb, S. Schreiber
DESY, Hamburg, Germany

The Free-Electron Laser in Hamburg (FLASH) is a user facility since 2005, delivering femtosecond short radiation pulses in the wavelength range between 4.1 and 44 nm using the SASE principle. In FLASH, the electron beam is accelerated to 1.25 GeV with L-band superconducting cavities. The electron source is a normal conducting RF-gun photoinjector. The L-band standing wave RF gun has one and a half cells. The gun is operated in burst mode with an RF pulse length of up to 900 microseconds and a repetition rate of 10 Hz. Several hundreds to thousands of bunches are accelerated per second. With 5 MW of pulsed forward power, the dissipated power inside the RF gun is 45 kW. In this paper we propose an operational mode which allows us to reduce the dissipated power to ease operation or to increase the effective duty cycle in the gun by pulsing the gun within one burst. We report on first experimental results at FLASH, where an RF burst of 46μRF-pulses with a length of 10 microseconds separated by 10 microseconds has been successfully generated reducing the dissipated power by a factor of 2.

THPC143

Beam-based Alignment for Injection Bump Magnets of the Storage Ring using Remote Tilt-control System

injection, alignment, betatron, synchrotron

3221

K. Fukami, K. Kobayashi, C. Mitsuda, T. Nakamura, K. Soutome
JASRI/SPring-8, Hyogo-ken, Japan

Stored beam is oscillated in vertical if the injection-bump magnets have alignment error in rotation around the beam-axis (tilt). In addition, even if the tilt is negligibly small, the beam out of the median plane is kicked in vertical direction. Also, there is a small long-term drift of the vertical beam positions in the bump magnets, which causes the gradual increase of the oscillation. We have already developed a remote tilt-control system to make a smooth realignment*. To observe the oscillation, the beam position was measured bunch-by-bunch and turn-by-turn by using a bunch-by-bunch feedback system** with high resolution strip-line type beam position monitor. To obtain responses to the tilts of each magnet, the oscillations were measured under the condition that the magnets were tilted intentionally. Tilt errors were calculated with least-squares method using the responses. In order to confirm the source of the residual oscillation, a frequency analysis was carried out with FFT method using the position data from 1st to 128th turns. We succeeded in suppressing the vertical oscillation to sub-microns order, the value of less than one tenth of the beam size.
* K. Fukami et al., Proc. of EPAC'08, p. 2172 (2008).
** T. Nakamura et al., Proc. of ICALEPCS'05, PO2.022-2 (2005).

THPC146

The Radiated EMI Isolation for TPS Kicker Magnet*

shielding, kicker, radiation, electromagnetic-fields

3227

C.S. Chen, C.K. Chan, C.L. Chen, Y.L. Chu, K.H. Hsu, C.Y. Kuo, Y.-H. Liu, C.-S. Yang
NSRRC, Hsinchu, Taiwan

Electromagnetic interference is a critical problem for electronic equipment, especially for those sophisticated measuring sensors using in TLS. Therefore, lots of efforts have been made to isolate the EM noise from the kicker magnets. In this article, different thicknesses of aluminum chambers are applied to block the radiated EM noise. Furthermore, the different widths of slits simulate the necessary openings on kicker assembly. According to the results of small-scale experiment, some parameters are obtained to design the enclosure of kicker magnet. Compared the results with the data from the original scale kicker, these parameters provide a believable guideline in the beginning of design status.

THPC174

Manufacturing and Testing of the First Phase Shifter Prototypes Built by CIEMAT for the European-XFEL

undulator, electron, free-electron-laser, laser

3308

I. Moya, J. Calero, J.M. Cela-Ruiz, L. García-Tabarés, A. Guirao, J.L. Gutiérrez, L.M. Martinez Fresno, T. Martínez de Alvaro, E. Molina Marinas, A.L. Pardillo, L. Sanchez, S. Sanz, F. Toral, C. Vazquez, J.G.S. de la Gama
CIEMAT, Madrid, Spain

Funding: Work partially supported by the Spanish Ministry of Science and Innovation under SEI Resolution on 17-September-2009.
The European X-ray Free Electron Laser (EXFEL) will be based on a 10 to 17.5 GeV electron linac. Its beam will be used in three undulator systems to obtain ultra-brilliant X-ray flashes from 0.1 to 6 nanometres for experimentation. The undulator systems are formed by 5m long undulator segments and 1.1m long intersections in between. They accommodate a quadrupole on top of a precision mover, a beam position monitor, two air coil correctors and a phase shifter. The function of the phase shifter is to adjust the phase of the electron beam with respect to that of the radiation field when the wavelength is changed by tuning the gap. In this context, CIEMAT will deliver 92 phase shifters, as part of the Spanish in-kind contribution to the EXFEL project. This paper describes the engineering design, the manufacturing techniques and the mechanical and magnetic tests realized on the first prototypes.

THPO001

Design Power Supply Considerations to Compensate Booster Power Supply Effects on the SOLEIL Storage Ring

booster, power-supply, storage-ring, dipole

3335

J.-P. Lavieville, R. Ben El Fekih, S. Bobault, D. Muller, L.S. Nadolski
SOLEIL, Gif-sur-Yvette, France

Top-up injection mode has been routinely in operation since March 2009 for various bunch filling patterns at Synchrotron SOLEIL. The electron beam stored current is maintained within 1%. At each injection the 3 Hz booster power supplies are ramped up and down over 10 seconds every 3 minutes in average. During this time DC and AC perturbations are observed on the storage ring horizontal closed orbit. Typically, the beamline source points can be shifted up to 10^-20 μm and the amplitude of the 3Hz frequency is multiplied by a factor 9. The origin of these perturbations lies in the imperfect compensation of the magnet currents circulating along the booster ring located inside the storage ring. To compensate these disturbances, a wire loop was installed in the booster cable tray fed by an in-house developed power supply. Its output current is driven by direct measurement of the main currents of the booster dipole, quadrupole, sextupole power supplies with a proper amplitude and phase shift. This paper presents the determination of the compensation needs according to beam measurements, the original design and the performance reached when this power supply is acting.

THPO004

An Active Power Filter Based on Wavelet Analysis

power-supply, simulation, electron, background

3341

X.L. Guo
Private Address, Beijing, People's Republic of China
X.L. Guo
IHEP Beijng, Beijing, People's Republic of China

As modern accelerator demands a magnet supply with a much higher stability, it is important to improve the quality of the magnet supply. An effective method to improve the output performance active power filter (APF) applied in current supply is proposed. To lowdown the harmonic constituents, the APF circuit generates a harmonic current, which added to the current from the main power supply, to countervail the ones in the supply’s current. At end of this paper, a simulation result is given to prove the effect of APF.

THPO005

A Dipole Power Supply Based on Multi-lever Inverter Technique

power-supply, dipole, status, ion

3343

Y.X. Chen, D.Q. Gao, Y.Z. Huang, R.K. Wang, H.B. Yan
IMP, Lanzhou, People's Republic of China

By applying multi-lever inverter technique to ion accelerator power supply, it can provide steady current in wide range, increase the power supply’s equivalent output frequency, then further promote power supply’s response capability and reduce the output ripple current. This article firstly by giving a detailed introduction of composite and basic working process of dipole power supply which also applied the technique mentioned above, interpret the working principle of multi-lever inverter, and illustrate its advantages. However, applying this technique will make controller more complicated, which need to be overcome by digital regulator technique. And meanwhile digital regulator technique can improve the power supply's performance. The second part of this article briefly introduces the overall scheme of digital regulator. And at last, this article illustrate the dipole power supply meet to design target and make some improvement by using the practical results to prove that applying multi-level inverter technique into accelerator power supply is practicable and beneficial.

THPO006

A Digital Power Supply Control Model in Heavy-ion Accelerator based on Dual Nios Cores

power-supply, ion, heavy-ion, pick-up

3346

R.K. Wang, Y.X. Chen, D.Q. Gao, Y.Z. Huang, H.B. Yan, H.H. Yan, Z.Z. Zhou
IMP, Lanzhou, People's Republic of China
R.K. Wang
Graduate University, Chinese Academy of Sciences, Beijing, People's Republic of China

According to the features of digital power supply and the requirements of pulse mode,this paper introduces a Digital Power Supply Control Mode(DPSCM) in Heavy-Ion Accelerator based on dual Nios cores,which meets the requirements of two basic running modes. The new method develops a system on-chip based on dual Nios cores by using SOPC technology in the Altera EP2C70 FPGA. Compared with traditional DPSCM,the dual Nios cores run simultaneously and cooperate well. As a result,the efficiency of the system is remarkably improved. Further,cores in parallel can realize reference waveforms switch in pulse mode effectively. We choose a 1150A/185V power supply as test bench. The Experimental result indicates that the system can realize the function of pulse mode,and the stability and tracking error meet the design requirements.

THPO007

Operation Status of SSRF Power Supplies and Interlocks for Top-up Operation

power-supply, storage-ring, HOM, quadrupole

3349

R. Li, C.L. Guo, M.M. Huang, T.J. Shen
SINAP, Shanghai, People's Republic of China

Digital switching mode magnet power supplies are used in SSRF accelerators which have been operating since 2008. Summary of the operation and maintenance of these power supplies will be shared over here. The availability of the power supplies is increased steadily over the past 4 years. And the power supplies interlocks for the SSRF top-up operation will be also introduced in this paper.

THPO011

Practical Experience with Self-optimizing, High Dynamic Control of Accelerator Magnet Power Supplies

power-supply, proton, resonance, feedback

3355

H. Jäckle
PSI, Villigen, Switzerland
F. Jenni, X.H. Ke
FHNW, Windisch, Switzerland

In 1999, the first fully digitally controlled magnet power supplies were commissioned at PSI (Paul Scherrer Institute, Switzerland). Today, approximately 1000 of them are in use at PSI and a multiple of that worldwide. An extended PI structure is used for control. PI control is very effective and simple to use but the attainable dynamic performance is usually limited by the higher order characteristics of the output filter and the load. For the future we expect increasing requirements from highly dynamic applications, such as beam orbit feedback systems and fast scanning magnets for proton irradiation of tumors. Therefore, a self-optimizing power supply control system was developed in collaboration with the University of Applied Sciences Northwestern Switzerland. It is based on the second generation of PSI digital power electronics controller, which allows more complex control algorithms and higher sampling rates. This paper presents the achieved dynamic performance of the new control structure for various types of power supplies and magnets and compares them with the dynamic performance obtained using standard PI control.

THPO012

Using a High Precision Programmable DC Power Supply of TPS Magnet

power-supply, quadrupole, storage-ring, sextupole

3358

Y.S. Wong, J.C. Huang, K.-B. Liu, W.S. Wen
NSRRC, Hsinchu, Taiwan

Taiwan government had been announcement to set up a third-generation synchrotron radiation light source in February 2010. It should be installed with 10³² sets of magnet power supplies for the storage ring and 152 sets for the injector. In the storage ring, high precision DC power supply for 48 dipoles magnets , 240 quadrupole magnets and 168 sextupole magnets. The main windings of quadrupole and sextupole magnets are powered by individual power supplies. In the booster rings, one set of dynamic power supply for the dipole magnets and four sets for quadrupole magnets run at the biased 3Hz quasi sinusoidal wave. The Taiwan photon source (TPS) plan was completed indication national synchrotron radiation research central (NSRRC) technical capability to build at its present site in seven years a 3~3.3 GeV electron energy, 518 meter circumference, low-emittance synchrotron storage ring which will offer one of the world's brightest synchrotron x-ray sources, provide cutting-edge experimental facilities and novel multidisciplinary scientific research opportunities, enhance world-class academic research, as well as create Taiwan's scientific research marvels in the twenty-first century.

THPO013

Development of a DSP-based Digital Control Three Phase Shunt Active Power Filter for Magnet Power Supply System

power-supply, simulation, sextupole, storage-ring

3361

B.S. Wang, K.-B. Liu, Y.S. Wong
NSRRC, Hsinchu, Taiwan

There will be 240 quadruple and 168 sextuple magnet power supplies installed in TPS storage ring, power factor of these power supplies is an important issue to be concerned. A digital control three-phase shunt active power filter (APF) for quadruple and sextuple magnet power supplies is implemented and the power factor is better than 0.98. The APF power stage employs a three-phase switch-mode rectifier (SMR) to reduce the input current harmonics distortion and correct the power factor. The digital control circuit of the three-phase shunt active power filter is implemented by using a multi-channel 12 bits analog-to-digital converter、high resolution Pulse Width Modulated (PWM) and a TMS320F28335 digital signal processor (DSP). The system configuration is described in three function blocks include principle of compensation、design of the snubber protective circuit and control strategies. Finally, the feasibility and validity of proposed scheme is simulated with Matlab simulink and verified by the homemade digital control three-phase shunt active power filter.

THPO014

Analysis and Compensator Design of Magnet Correction Power Supply

power-supply, feedback, simulation

3364

Y.S. Wong, J.C. Huang, K.-B. Liu
NSRRC, Hsinchu, Taiwan

This paper presents a new method for the analysis and design of compensators for magnet correction (MC) power supply. The system has to need controllers to satisfy required gain and phase margin specifications and compensator by adding to circuit controller and switch. The gain-phase margin tester method can transform of the controller and find solutions on the figure. According to circuit frequency response and transfer function by theory analysis and simulation design new method compensators to improved anti-disturbance and stability of the system.

THPO015

External Energy Dump for Superconducting Magnet of the Uni-polar Power System

power-supply, superconductivity, simulation, HOM

3367

Y.S. Wong, K.-B. Liu, W.S. Wen
NSRRC, Hsinchu, Taiwan

This thesis focuses on the design of superconducting discharge energy circuit structure in Uni-polar power supply [1]~[3]. Superconductivity is an electrical resistance of exactly zero which occurs in certain materials below a characteristic temperature [4]. It’s operation at the steady state in constant temperature area. When Rise up resistance and temperature of superconductivity will have been dissipates function. Uni-polar power supply has needed to design discharge energy circuit when superconductor reduces the current. To make use release the energy transfers to external circuit keep the constant temperature with the superconductivity. The superconducting coil wingding has a total length magnetic period of 56.56cm, total magnet length of 478.9cm and vertical (horizontal) magnetic field of 18.7T.

THPO016

Design and Implementation the LLC Resonant Transformer

impedance, power-supply, simulation

3370

C.-Y. Liu, Y.S. Wong
NSRRC, Hsinchu, Taiwan

The energy and dc to dc conversion voltage waveform of the LLC resonant transformer are required to achieve optimal working condition of the resonant region frequency. To meet this requirement, a reliable and precise instrument is needed to scan the resonant cure of the LLC resonant transformer such that its output power performance can meet the required specification. In this paper, the design and model of a new LLC resonant transformer deployed in NSRRC is described. This LLC resonant transformer is capable of delivering energy conversion with high efficiency performance, which is better than traditional transformer, and the voltage transfer ratio is depended on the resonant Frequency. Using the simulation circuit model to develop a power converter of it is also included in the design of this new LLC resonant transformer. It has been tested and proven to be working well in power conversion with excellent efficiency and performance.

THPO017

Improvement of Output Current Characteristics for Bira MCOR30 Correction Magnet Power Supply

power-supply, HOM, feedback, storage-ring

3373

J.C. Huang, K.-B. Liu, Y.S. Wong
NSRRC, Hsinchu, Taiwan

The correction magnet power supplies installed at the Taiwan light source (TLS) are Bira Systems’ MCRO 30 power modules, a full-bridge configuration power stage converting the unregulated DC bulk power into a bi-polar current source. The MCOR 30 is theoretically regulated under a very fine control method, with this control method the Bira MCOR 30 should overcome the zero crossover distortion of a standard H-Bridge PWM schemes is used and result in a low frequency noise signature on the output when the magnet current is close to zero. The PWM control circuitry embedded in MCOR 30 theoretically but not really fulfills the purpose what the MCOR 30 want to achieve. With a home-made PWM control circuitry installed into MCOR 30, the width of real pulses can smoothly drop to zero, the MCOR 30 could output current not only with a low frequency noise signature but also much with higher bandwidth of frequency response and much lower Total Harmonic Distortion no matter what output current is demanded.

THPO018

N+1 Redundancy Power Supply System by Paralleling Current Converter Modules with Digital Regulation Control

power-supply, feedback, simulation, storage-ring

3376

B.S. Wang, K.-B. Liu, Y.S. Wong
NSRRC, Hsinchu, Taiwan

The N+1 redundancy power supply system is fulfilled with adopting the Bira System MCOR30s as a platform, eight pieces of Bira MCOR 30 power converter boards are installed at crate 2512 and outputs are connected together, the output current of these paralleled eight Bira MCOR 30 power converters are regulated by an external homemade digital control circuit. With homemade digital control circuit, these paralleled eight Bira MCOR 30 power converter modules could deliver up to 240A/30V with ±20ppm precision and stability. The digital regulation control circuit of the N+1 redundancy power supply system is implemented by using a multi-channel DAC5868 16-bits digital-to-analog converter (DAC)、a high speed AD8382 18-bits analog-to-digital converter and a TMS320F28335 digital signal processor (DSP). The update reference voltage frequency of DAC is 83.3 kHz. A DCCT is used as the current feedback component and the output current ripple of the N+1 redundancy power supply system is lower than 20ppm which is beyond the requirement of current TLS quadruple and sextuple power supplies and qualified to be used in the future TPS facility.

THPO019

TPS Fast Corrector Magnet Power Converter

feedback, power-supply, booster, monitoring

3379

Y.D. Li, K.-B. Liu
NSRRC, Hsinchu, Taiwan

With the increasing demand of the current output accuracy on the TPS(Taiwan Photon Source) project, the MCOR 30 correction power supplies used in current TLS ring are no longer sufficient to meet the TPS requirement. Therefore, power supply group developments a high-precision low output current power supply with a DCCT as an output current feedback component for correction magnets of the future TPS ring. During the research and development experiment phase, we found the DCCT is more possible damaged than the other components. With keeping the architecture of the high-precision low output current power supply, but the DCCT output current feedback component is replaced with a current sensing Shunt resistor. This paper will discuss the design methods of utilizing several different types current sensing Shunt resistor to reduce the cost of power supply and the probability of damage, and improve frequency response of power supply.

THPO020

TPS Digital Corrector Magnet Power Converter based on FPGA

feedback, dipole, booster, quadrupole

3382

Y.D. Li, Y.-C. Chien, K.-B. Liu
NSRRC, Hsinchu, Taiwan

This thesis presents the design and implementation of a FPGA-based fully digital-controlled programmable power supply.

THPO021

A New Control System for the ISIS Main Magnet Power Supply

power-supply, status, target, synchrotron

3385

J. Ranner, T.E. Carter, S. West
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom

The ISIS pulsed neutron and muon source at the Rutherford Appleton Laboratory in Oxfordshire is a world-leading centre for research in the physical and life sciences. At the heart of the ISIS accelerator is a proton synchrotron which uses a ring of dipole and quadrupole magnets connected in series and configured as a White Circuit*. The circuit allows the magnets to be fed with an AC current superimposed on a DC current. A recent upgrade to the main magnet power supply** involved the replacement of the original AC supply, a motor-alternator set, with a bank of four 300kVA UPS (uninterruptible power supplies) which had been modified to allow the output voltage to be varied using serial commands. However, when initially tested, this method was unable to produce the required stability in the main magnet current. This paper describes the further modifications to the UPS units to achieve the required stability and the development of a LabVIEW control system which manages the data acquisition and analysis, the communication to the UPS, interlock equipment and user interface, and provides a low latency control loop to the UPS and DC bias power supplies.
* M.G. White et al., “A 3-BeV High Intensity Proton Synchrotron”, CERN Symp.1956 Proc., p525.
** S. West, J.W. Gray, W.A. Morris, “Upgrade of the ISIS Main Magnet Power Supply”, EPAC 2004 p1467.

THPO022

Risk Assessment of the Chopper Dipole Kicker Magnets for the MedAustron Facility

dipole, power-supply, kicker, radiation

3388

T. Kramer, T. Stadlbauer
EBG MedAustron, Wr. Neustadt, Austria
M.J. Barnes, M. Benedikt, T. Fowler
CERN, Geneva, Switzerland

The MedAustron facility, to be built in Wiener Neustadt (Austria), will provide protons and ions for both cancer therapy and research. Different types of kicker magnets will be used in the facility, including fast beam chopper dipoles: these allow the beam to be switched on and off for routine operational reasons or in case of emergency. One of the main requirements for the beam chopper system is reliability. A criticality analysis, to chart the probability of failure modes against the severity of their consequences of the fault, has been carried out for the chopper dipole system. This “Failure Mode, Effects, and Criticality Analysis” (FMECA), has been used to highlight failure modes with relatively high probability and severity of consequences: conservative ratings of critical components and appropriate redundancy, together with measurements and interlocks, have been used to reduce the probability and criticality of faults. This paper presents the results of the FMECA.

THPO023

Ageing of Airix Accelerating Units

vacuum, pulsed-power, monitoring, high-voltage

3391

A. Georges, H. Dzitko, B. Gouin, M. Mouillet
CEA, Arpajon, France

Airix is a linear accelerator producing a 60ns, 2kA, 19MeV electron beam. It has been operated in a single shot mode by the “Commissariat à l’Energie Atomique et aux Energies Alternatives” (CEA) for flash X-ray radiography purposes for 10 years. Its modular architecture increases the beam energy by quarter of a megavolt step: each cell delivers a 75ns impulsion of 250kV amplitude. Our aim is to guarantee a minimum lifetime for the cells and their pulse driver. To achieve it, we are operating a test-bed at a moderately low repetition rate (a couple of pulses per minute) for tens of thousands of pulses. Afterwards, we will run a series of both non-destructive and destructive analysis to identify the most stressed parts, and, if necessary, the means of increasing the cell lifetime. This paper describes the test-bed: a pair of cells and its driver, and the first results of these ageing tests.

THPS023

Automatic Tuner Unit Design, Simulation and Measurement for Automatic Operation of the RF System in the ESS-Bilbao H⁺ Ion Source

impedance, plasma, ion, ion-source

3469

L. Muguira, I. Arredondo, D. Belver, M. Eguiraun, F.J. Fernandez Huerta, J. Feuchtwanger, N. Garmendia, O. Gonzalez, J. Verdu
ESS-Bilbao, Zamudio, Spain
V. Etxebarria, J. Jugo, J. Portilla
University of the Basque Country, Faculty of Science and Technology, Bilbao, Spain

Funding: The present work is supported by the Basque Government and Spanish Ministry of Science and Innovation.
The Ion Source responsible intended to generate a high current and low emittance proton beam for the ESS-Bilbao is currently under construction. The plasma in the source is generated by coupling the 2.72 GHz power input from a Klystron through a magnetic field with an intensity close to the electron cyclotron resonance (ECR) field at the input RF frequency. The electrical behavior of the plasma strongly depends on different plasma characteristics which, at the same time, also depend on the microwave absorption. Thus, in order to maximize the RF power transferred to the plasma, a waveguide automatic tuner unit is employed to match the generator output to the electric impedance of the plasma. This device is generally adjusted manually. In this paper, the design, the 1D and 3D simulation, and measurements are presented which allows us to propose an automatic and real time control of the device. In a first approximation, with the aim of testing the proper operation of the automatic tuner unit, an in-house variable phase shifter and attenuator has been designed and manufactured to simulate the electric behavior of the plasma.

THPS038

Possibility of longitudinal painting injection with debuncher system in J-PARC linac

injection, linac, simulation, cavity

3505

G.H. Wei
KEK/JAEA, Ibaraki-Ken, Japan
M. Ikegami
J-PARC, KEK & JAEA, Ibaraki-ken, Japan

J-PARC linac is presently operating with the output energy of 181 MeV and providing a negative hydrogen beam to the succeeding 3-GeV synchrotron. To achieve the design beam power of 1 MW from the synchrotron, we plan to upgrade the linac beam energy to 400 MeV. In the energy upgrade, we replace the debuncher system installed between the linac and synchrotron. The main roles of the debuncher system are to correct the momentum jitter and to control the momentum spread at the ring injection. Usually, we don’t assume acceleration or deceleration with the debuncher cavities except for passive momentum jitter correction. However, we are studying the possibility of actively controlling the center momentum with debuncher cavities to enable longitudinal painting injection into the succeeding ring as a potential new feature. If it finds feasible, it would provide an additional tuning knob to mitigate the beam loss in the synchrotron. In this paper, we show a beam dynamics design of the new debuncher system with emphasis on the possibility of its application for the longitudinal painting injection.

THPS039

Diffusion of a Circulating Beam by the RF-Knockout with a Spectrum including Many Bands

synchrotron, resonance, extraction, simulation

3508

M. Tashiro, T. Nakanishi
Nihon University, Narashino, Chiba, Japan

The fast control of beam spill extracted from a synchrotron is a key function for the spot scanning irradiation in cancer therapy application. The authors have proposed the extraction method for the application which uses the control of a quadruple field of fast response as well as the RFKO (QAR method). The RF signal for the RFKO should cover a frequency band corresponding to a tune spread. A simulation with continuous RFKO operation, however, showed a spill intensity changes with time largely with only this band. The large change of spill is due to not uniform diffusion of circulating beam and it makes a constant spill difficult in the QAR method. A wider band gives a uniform spill, but it requires a larger Amp power. We proposed a spectrum including many bands around the resonances to reduce the power, since the bands outside around the resonances do not contribute to the diffusion. Such a spectrum has also an advantage to increase spill intensity for the QAR method, using a band so that the RFKO diffuses more inside particles of the separatrix but also it affects little them near the boundary. We can extract several times particles with a same shrink ratio of the separatrix.

THPS053

Results from the HiRadMat Primary Beam Line Commissioning

beam-losses, optics, proton, instrumentation

3547

C. Heßler, M. Arruat, J. Bauche, K. Bestmann, J. Blanco, N. Conan, K. Cornelis, I. Efthymiopoulos, H. Gaillard, B. Goddard, D. Grenier, G.G. Gros, A. Habert, L.K. Jensen, V. Kain, G. Le Godec, M. Meddahi, S. Pelletier, P. Pepinster, B. Puccio, C. Theis, P. Trilhe, G. Vandoni, J. Wenninger
CERN, Geneva, Switzerland

The High Radiation to Materials facility (HiRadMat) is a new experimental area at CERN, for studies of the impact of high-intensity pulsed beams on accelerator components and materials. The beam is delivered from the SPS by a new primary beam line, which has been constructed during the 2010/11 winter technical stop. The paper summarizes the construction phase and describes the results from the beam line commissioning in spring 2011. Beam parameter and aperture measurements are presented, as well as steering tests. A special emphasis has been put on the handling of the exceptionally flexible beam line optics in the control system.

THPS060

RAM Methodology and Activities for IFMIF Engineering Design

target, neutron, vacuum, rfq

3565

J.M. Arroyo, A. Ibarra, J. Molla
CIEMAT, Madrid, Spain
J. Abal, E. Bargalló, J. Dies, C. Tapia
UPC, Barcelona, Spain

IFMIF will be an accelerator-based neutron source to test fusion candidate materials. The Engineering Validation and Engineering Design Activities of IFMIF are aimed to deliver the complete engineering design file of this major facility. Achieving a high level of availability and reliability is a key point for IFMIF mission. A goal of 70% of operational availability has been established. In order to fulfill the availability requirements, RAM has to be considered during the engineering design phase. This paper summarizes the methodology developed and the proposed process aimed at including RAM in the design of IFMIF, as well as the activities performed in this framework. Overall RAM specifications have been defined for IFMIF project. RAM methodology dealing with RAM design guidelines, reliability database and RAM modelization has been developed. As a first step for the iterative process of RAM analysis of IFMIF design, a fault tree model based on a new reliability database has been performed with Risk Spectrum®. The result is a first assessment of the availability and first allocation of RAM requirements.

THPS069

Particle Beam Characteristics Verification for Patient Treatment at CNAO

synchrotron, simulation, proton, monitoring

3586

M. Donetti, M. Ciocca, M.A. Garella, A. Mirandola, S. Molinelli, M. Pullia, G. Vilches Freixas
CNAO Foundation, Milan, Italy
S. Giordanengo
INFN-Torino, Torino, Italy
M. Lavagno
DE.TEC. TOR. S.r.l., Torino, Italy
R. Sacchi
Torino University, ., Torino, Italy

At Centro Nazionale di Adroterapia Oncologica (CNAO) in Pavia, Italy, a synchrotron has been designed to treat tumor with protons and ions delivered with a full active delivery system. Several pencil beams with appropriate energy are steered in sequence to the right positions inside the tumor volume covering it totally. Several beam characteristics have to be deeply known in order to be able to deliver a safe patient treatment. CNAO is now able to send beam in the treatment room and the Dose Delivery system is in the commissioning phase. Dose Delivery system, composed by beam monitoring and scanning magnets, manages the treatment with high precision in real time. The dose delivery system functions and components will be presented. Beam characteristic are studied by means of several detectors and verification systems in the treatment room to guarantee the quality of the treatment. Quality is checked in terms of pencil beam characteristics and characteristic of the overall dose in the treatment fields. The detector used and the results of the measurements will be shown.

THPS071

The HIMAC Beam-intensity Control System for Heavy-ion Scanning

feedback, extraction, status, ion

3592

K. Mizushima
Chiba University, Graduate School of Science and Technology, Chiba, Japan
T. Furukawa, Y. Iwata, K. Katagiri, K. Noda, S. Sato, T. Shirai
NIRS, Chiba-shi, Japan
E. Takeshita
Gunma University, Heavy-Ion Medical Research Center, Maebashi-Gunma, Japan

Raster scanning irradiation has been carried out at a HIMAC new treatment facility in NIRS. In order to reduce the difference between prescribed and delivered dose distribution, the accurate beam-intensity control with a low ripple and the fast beam-on/off switching are strongly required. For this purpose, we have developed a new beam-intensity control system using the RF-knockout slow extraction. To keep the beam rate constant, this system controls the transverse RF voltage with the feedback proportional-integral control. In addition, the beam-on/off response was improved by the fast quadrupole magnets and the implementation of the transverse beam preheating method. As a result of the system commissioning, it was verified that this system can modulate the beam-intensity with a low ripple and switch the beam-on/off with quick responses. We will report the result in detail.

THPS072

Commissioning of NIRS Fast Scanning System for Heavy-ion Therapy

target, synchrotron, ion, monitoring

3595

T. Furukawa, T. Inaniwa, K. Katagiri, K. Mizushima, K. Noda, S. Sato, T. Shirai
NIRS, Chiba-shi, Japan
E. Takeshita
Gunma University, Heavy-Ion Medical Research Center, Maebashi-Gunma, Japan

The commissioning of NIRS fast scanning system was started in September 2010, when the first beam was successfully delivered from the HIMAC synchrotron to the new treatment room. After the fine tuning of the new transport line, the commissioning of the scanning system was carried out as following steps; 1) verification of the beam size, position and intensity stability; 2) verification of beam scanning performance and calibration; 3) verification of beam monitor performance; 4) dose measurement of pencil beams for the beam parameterization in the treatment planning system; and 5) verification of 3D dose conformation. As a result of the commissioning, we verified that the new scanning delivery system can produce an accurate 3D dose distribution for the target volume in combination with the planning software. We will report the commissioning results and the performance of the scanning system.

THPS075

Recent Progress of New Cancer Therapy Facility at HIMAC

synchrotron, ion, target, heavy-ion

3604

T. Shirai, T. Furukawa, T. Inaniwa, Y. Iwata, K. Katagiri, K. Mizushima, S. Sato, E. Takada, Y. Takei, E. Takeshita
NIRS, Chiba-shi, Japan
T. Fujimoto, T. Kadowaki, T. Miyoshi, Y. Sano
AEC, Chiba, Japan

Since 1994, the carbon beam treatment has been continued at Heavy Ion Medical Accelerator in Chiba (HIMAC). The total number of patients treated is more than 5,000 in 2010. Based on more than ten years of experience with HIMAC, we have developed new treatment equipments toward adaptive cancer therapy with heavy ion at New Particle Therapy Research Facility in NIRS.

THPZ025

Stability of the LHC Transfer lines

injection, extraction, ion, kicker

3741

V. Kain, W. Bartmann, C. Bracco, L.N. Drosdal, B. Goddard, M. Meddahi, J.A. Uythoven, J. Wenninger
CERN, Geneva, Switzerland

The LHC is filled from the SPS through two 3 km transfer lines. The injected beam parameters need to be well under control for luminosity performance, machine protection and operational efficiency. Small fractions of beam loss on the transfer line collimation system create showers which can trigger the sensitive LHC beam loss monitor system nearby and cause a beam abort during filling. The stability of the transfer line trajectory through the collimators is particularly critical in this respect. This paper will report on the transfer line trajectory stability during the proton run in 2011, correlations with injection losses, correction frequency and the most likely sources for the observed oscillations.

THPZ029

Principles for Generation of Time-dependent Collimator Settings during the LHC Cycle

injection, optics, collimation, beam-losses

3753

R. Bruce, R.W. Assmann, S. Redaelli
CERN, Geneva, Switzerland

The settings of the LHC collimators have to be changed during the cycle of injection, ramp and squeeze to account for variations in the orbit, beam size and normalized distance to the beam center. We discuss the principles for how the settings are calculated and show a software tool that computes them as time-dependent functions from beam-based data and theoretical optics models.

THPZ033

Operational Experience and Performance of the LHC Collimator Controls System

collimation, monitoring, collider, optics

3765

S. Redaelli, A. Masi
CERN, Geneva, Switzerland

In order to handle stored energies up to 360 MJ, the LHC relies on a collimation system that consists of 100 movable collimators. Compared to other accelerator, the complexity of this system is unique: more than 400 motors and about 600 interlocked position sensors must be controlled in all the machine phases in order to ensure the cleaning and machine protection roles of the system. In this paper, the controls system and the setting management are presented and the operational experience accumulated in the 2 first years of operation is discussed, focussing in particular on failure and availability statistics during the LHC operation.

THPZ034

Semi-automatic Beam-based Alignment Algorithm for the LHC Collimation System

alignment, collimation, beam-losses, feedback

3768

G. Valentino, R.W. Assmann, S. Redaelli, N.J. Sammut, D. Wollmann
CERN, Geneva, Switzerland
G. Valentino
University of Malta, Information and Communication Technology, Msida, Malta

Full beam-based alignment of the LHC collimation system was a lengthy procedure as the collimators were set up manually. A yearly alignment campaign has been sufficient for now, although in future this may lead to a decrease in the cleaning efficiency if machine parameters such as the beam orbit drift over time. Automating the collimator setup procedure can allow for more frequent alignments, therefore reducing this risk. This paper describes the design and testing of a semi-automatic algorithm as a first step towards a fully automatic setup. Its implementation in the collimator control software and future plans are described.

FRYCA01

Towards a World Without Nuclear Weapons: How can Scientists Help?

target, status, acceleration

3794

J. Duncan
UK Mission for Multilateral Arms Control & Disarmament, Cointrin, Geneva, Switzerland

The Nuclear Non-Proliferation Treaty could eventually result in a significant reduction - or even complete elimination - of nuclear weapons. Technologies from the accelerator field, such as transmutation of weapon-grade uranium and plutonium, alternative techniques for nuclear power generation, detection of fissile material and verification, will be very important for this effort. The present trend in modern diplomacy is to form unconventional alliances to make progress on challenging issues. Could an alliance between diplomats and scientists help to achieve the ultimate goal of reducing and eventually eliminating nuclear weapons?