IPAC2013 - List of Keywords (insertion)

Paper	Title	Other Keywords	Page
MOPEA024	Effects of Insertion Devices in the High Field Lattice Structure of ILSF Storage Ring	dynamic-aperture, insertion-device, quadrupole, radiation	124
	F. Saeidi, E. Ahmadi, H. Ghasem ILSF, Tehran, Iran H. Ghasem IPM, Tehran, Iran
	We have studied effects of different insertion devices(IDs) in the high filed ILSF storage ring. Radiation from the IDs leads to change emittance and energy spread of the ring and magnetic field of them results to beta-beating, tune shift and shrink of dynamic aperture. This paper describes effects of the IDs on beam parameters of the high field lattice structure of ILSF storage ring and proposes the compensation method of these effects. farhad.saeidi@ipm.ir

MOPEA049	The First Experience of PLS-II Operation	injection, linac, storage-ring, lattice	190
	S.H. Nam, M.-H. Cho, J.Y. Huang, C.D. Park, S. Shin PAL, Pohang, Kyungbuk, Republic of Korea
	Funding: Mministry of Education, Science and Technology (MEST) of Korea One of recent major activities of the Pohang Accelerator Laboratory (PAL) in Korea has been PLS-II user operation. The PLS-II is a Korea’s only and brand new 3rd generation synchrotron radiation source that was upgraded from the 16-year-old PLS in 2011. The old PLS started user service from 1995 and shutdown on Dec. 10, 2010. The PLS-II has been open to users from March 2012 with upgraded performance. The performance parameters of the PLS-II are 5.8 nm-rad emittance, 3.0GeV beam energy, and 400mA beam current with the top-up injection. The unique feature of PLS-II will be the implementation of 20 insertion-devices in a compact double-bend-achromat storage ring of 280m-long circumference. Among 20 insertion-devices, 14 are in-vacuum undulators. The first year operation in 2012 will be successfully completed and the operational statistics will be summarized and discussed.

MOPEA051	Insertion Devices Influence on the Beam Dynamics at Siberia-2 Storage Ring	dynamic-aperture, undulator, wiggler, insertion-device	193
	S.I. Tomin, V. Korchuganov NRC, Moscow, Russia
	Siberia-2 is now running with 7.5 T wiggler and the installation of additional two 3 T SC wigglers is under consideration. Besides that the insertion of an undulator with very short period up to 7 mm is planed. We studied an influence of the insertion devices on the dynamic aperture using new computer code which permits to find an electron beam trajectory in ID by Runge-Kutta integrator. Using two independent approaches it was shown that ID introduces the nonlinear components of magnetic field which lead to significant decrease of dynamic aperture in vertical direction. Nonlinear components of ID magnetic field are shown. Results of numerical calculation of Siberia-2 dynamic aperture are presented as well.

MOPEA059	The Optimization of Transverse Stripline Kicker	kicker, simulation, vacuum, impedance	214
	H.P. Hsueh, C.-C. Chang, Y.P. Chang, J.-R. Chen, Y.T. Cheng, G.-Y. Hsiung, Y.C. Yang NSRRC, Hsinchu, Taiwan J.-R. Chen National Tsing Hua University, Hsinchu, Taiwan
	The construction of a new 3 GeV synchrotron facility, Taiwan Photon Source, is ongoing. It is required to install stripline kickers to suppress instability generated by mismatch between injection kickers or imperfect installation of vacuum components all around. First, the design philosophy will be described for transverse stripline kickers. HFSS electromagnetic simulation software is used to optimize all structure parameters like electrode dimensions, electrode distance from vacuum chambers etc. to make transverse stripline kicker working more efficiently and effectively. All simulation results will be presented in this paper and all structure dimension choices will be discussed and the final prototype structure dimensions will be selected from the discussion.

MOPEA075	Completion of the Brightness Upgrade of the ALS	lattice, brightness, emittance, sextupole	261
	C. Steier, B.J. Bailey, K. Berg, A. Biocca, A.T. Black, P.W. Casey, D. Colomb, R.F. Gunion, N. Li, A. Madur, S. Marks, H. Nishimura, G.C. Pappas, K.V. Petermann, G.J. Portmann, S. Prestemon, A.W. Rawlins, D. Robin, S.L. Rossi, T. Scarvie, D. Schlueter, C. Sun, H. Tarawneh, W. Wan, E.C. Williams LBNL, Berkeley, California, USA C. Chen, J. Jin, Y.M. Wen, J. Wu, L. Yin, J.D. Zhang, Q.G. Zhou SINAP, Shanghai, People's Republic of China
	Funding: The Advanced Light Source is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. The Advanced Light Source (ALS) at Berkeley Lab remains one of the brightest sources for soft x-rays worldwide. A multiyear upgrade of the ALS is underway, which includes new and replacement x-ray beamlines, a replacement of many of the original insertion devices and many upgrades to the accelerator. The accelerator upgrade that affects the ALS performance most directly is the ALS brightness upgrade, which reduced the horizontal emittance from 6.3 to 2.0 nm (2.5 nm effective). Magnets for this upgrade were installed starting in 2012 followed by a transition to user operations with 2.0 nm emittance in spring 2013.

MOPWO027	Improved TEAPOT Method and Tracking with Thick Quadrupoles for the LHC and its Upgrade	quadrupole, optics, lattice, multipole	945
	H. Burkhardt, R. De Maria, M. Giovannozzi, T. Risselada CERN, Geneva, Switzerland
	The comparison between tracking with thick and thin lens models for the LHC have been studied. A widely-used method to generate thin models is based on the TEAPOT slicing, which, in the original implementation is limited in the number of slices. In this paper an improved method is presented, which overcomes some of the limitations of the original TEAPOT. The performance is analysed and the impact on numerical simulation of the dynamic aperture is evaluated, both for the LHC and its upgrade, HL-LHC.

MOPWO035	Layouts for Crystal Collimation Tests at the LHC	collimation, simulation, optics, proton	966
	D. Mirarchi, S. Redaelli, W. Scandale CERN, Geneva, Switzerland D. Mirarchi The Imperial College of Science, Technology and Medicine, London, United Kingdom V. Previtali Fermilab, Batavia, USA
	Various studies have been carried out in the past years regarding crystal collimation for the LHC. A new extensive campaign of simulations was performed to determine optimum layouts for beam tests at the LHC. The layouts are determined based on semi-analytical models for the dynamics of channeled particles. Detailed SixTrack tracking with all collimators of the ring are then used to validate the different options. An overview of the ongoing studies is given. Comparative studies between the present collimation system, the crystal collimation system, and different crystal collimation layout are presented.

MOPWO040	Analysis of Failures of the LHC Collimators during the 2010-2013 Operation	collimation, injection, controls, luminosity	981
	S. Redaelli, A. Masi CERN, Geneva, Switzerland
	The LHC collimation system must be available in all phases of the machine operation in order to handle the high stored beam energies. The system availability is therefore crucial to achieve an efficient LHC operation. The collimation system has proved to work reliably in the first years of LHC operation, with total stored energies up to 140 MJ. The impact on the machine availability has been limited. The analysis of collimation system availability and the failure rate in the years 2012-2012 is reviewed with the aim to identify possible further improvements for the future.

MOPWO048	Cleaning Performance of the LHC Collimation System up to 4 TeV	alignment, collimation, betatron, beam-losses	1002
	B. Salvachua, R.W. Aßmann, R. Bruce, M. Cauchi, D. Deboy, L. Lari, A. Marsili, D. Mirarchi, E. Quaranta, S. Redaelli, A. Rossi, G. Valentino CERN, Geneva, Switzerland M. Cauchi UoM, Msida, Malta L. Lari IFIC, Valencia, Spain D. Mirarchi The Imperial College of Science, Technology and Medicine, London, United Kingdom G. Valentino University of Malta, Information and Communication Technology, Msida, Malta
	Funding: Research supported by EU FP7 HiLumi LHC (Grant agreement 284404) In this paper we review the performance of the LHC collimation system during 2012 and compare it with previous years. During 2012, the so-called tight settings were deployed for a better cleaning and improved beta-star reach. As a result, a record cleaning efficiency below a few 0.0001 was achieved in the cold regions where the highest beam losses occur. The cleaning in other cold locations is typically a factor of 10 better. No quenches were observed during regular operation with up to 140 MJ stored beam energy. The system stability during the year, monitored regularly to ensure the system functionality for all machine configurations, and the performance of the alignment tools are also reviewed.

MOPWO051	Estimate of Warm Magnets Lifetime in the Betatron and Momentum Cleaning Insertions of the LHC	luminosity, betatron, collimation, radiation	1011
	B. Salvachua, R. Bruce, M. Brugger, F. Cerutti, S. Redaelli CERN, Geneva, Switzerland
	The CERN LHC collimation system is designed to perform momentum and betatron cleaning in different insertions, respectively IR3 and IR7. The insertions are not perfectly decoupled because the dispersion in IR7 is not null and the beta function in IR3 is not zero. The detailed sharing of losses between the two insertions depends on the relative collimator settings as observed by the change between 2011 and 2012 LHC operation. In this report, using the beam loss measurements at the primary collimators of IR3 and IR7, the total BLM losses in the two insertions are calculated and compared to each other. These studies are also used to quantify the total dose to warm magnets in those IRs with the aim to understand better their lifetime and the implications of the radiation to electronics. This will be of particular importance in view of LHC operating at nominal performance after several years of operation.

TUODB203	Dual Chip in Single Module Solid-State Power Amplifier Design for Compact Transmitter Architecture	impedance, storage-ring, booster, linac	1158
	T.-C. Yu, L.-H. Chang, M.H. Chang, L.J. Chen, F.-T. Chung, M.-C. Lin, Y.-H. Lin, Z.L. Liu, C.H. Lo, M.H. Tsai, Ch. Wang, T.-T. Yang, M.-S. Yeh NSRRC, Hsinchu, Taiwan
	At present, the high power solid-state technique transmitter design are composed of hundreds parallel combined single chip for hundreds Watts power modules to achieve enough output power. Although the large numbers can bring high redundancy during system operation, the power hungry of next generation RF system of accelerator would need much more modules to reach its power requirement. Huge amount of power modules would bring the complexity and difficulty in power combining, system construction, management and maintenance. To overcome this problem, upgrading the power level of a single module could be the solution. Besides depending on the power level growing with technology advancement in semiconductor industry, a circuit level solution to combine dual chip in advance in a single PCB board is proposed to produce twice power as single chip. Such feasible solution can overcome the over-complexity of future several-hundreds kW solid-state transmitter design.
	Slides TUODB203 [2.337 MB]

TUPFI015	Study of the IR2 and IR8 Squeezeability for HL-LHC Upgrade	optics, injection, quadrupole, luminosity	1361
	A.V. Bogomyagkov BINP SB RAS, Novosibirsk, Russia R. De Maria CERN, Geneva, Switzerland
	Funding: The HiLumi LHC Design Study is included in the HL-LHC project and is partly funded by the European Commission within the Framework Programme 7 Capacities Specific Programme, Grant Agreement 284404. The paper presents the results of the study of different optics configurations which allow to reach smaller beta functions at the IP2 and IP8 in the framework of the HL-LHC project. The variants at collision energies must be compatible with the ATS* scheme which provides small beta function at the IP1 and IP5 or provide low beta function for Alice and LHCb during ion operatations. The ones at injection must satisfy injection transfer lines and aperture constraints. The final goal is to find the overlap between the phase advances of all the configuration for IR2 and IR8 respectively, in order to mainting the LHC working point without rematching the remaining insertions. * S. Fartoukh, ‘’An Achromatic Telescopic Squeezing (ATS) Scheme for LHC Upgrade’’, in proceedings of IPAC11, p. 2088.

TUPFI049	Studies of 10 GeV Decay Ring Design for the International Design Study of the Neutrino Factory	injection, kicker, optics, storage-ring	1457
	D.J. Kelliher, C.R. Prior STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom N. Bliss, N.A. Collomb STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom A. Kurup, J. Pasternak Imperial College of Science and Technology, Department of Physics, London, United Kingdom J. Pasternak STFC/RAL, Chilton, Didcot, Oxon, United Kingdom H. Witte BNL, Upton, Long Island, New York, USA
	Due to the discovery of large θ13 the final muon storage energy in the baseline solution of International Design Study for the Neutrino Factory (IDS-NF) has been set at 10 GeV. A new racetrack design has been produced for the decay ring to meet this requirement. The details of lattice design and the beam dynamics calculations are discussed. The feasibility of the injection system for both positive and negative muons into the ring is explored in details.

TUPFI051	Optics Transition between Injection and Collision Optics for the HL-LHC Upgrade Project	quadrupole, optics, injection, luminosity	1460
	M. Korostelev, A. Wolski The University of Liverpool, Liverpool, United Kingdom R. De Maria, S.D. Fartoukh CERN, Geneva, Switzerland M. Korostelev, A. Wolski Cockcroft Institute, Warrington, Cheshire, United Kingdom
	Funding: The HiLumi LHC Design Study is included in the HL-LHC project and is partly funded by the European Commission within the Framework Programme 7 Capacities Specific Programme, Grant Agreement 284404. Plans for the luminosity upgrade of the LHC collider at CERN (HL-LHC) are based on implementation of magnets with larger apertures in the interaction regions, together with the ATS [] technique to reach very low values of the beta function at the collision points. The transition from injection to collision optics will be carried out in two stages, and will involve varying the strengths of the quadrupoles within the straight sections. Solutions for the optics transition have to meet a variety of challenging constraints, including constraints on the phase advances and Twiss parameters throughout the straights involved in the transition, specified minimum and maximum strengths of the quadrupoles, etc. Moreover, to minimize the time taken for the transition, the variation of the quadrupole strengths should be as smooth as possible, especially for the strongest quadrupoles. Avoiding changes of slope as much as possible will also minimize hysteresis effects in the super-conducting matching quadrupoles participating to the process. This paper presents one possible solution for the optics transition, calculated for the HLLHCv1.0 version of the optics and layout of the HL-LHC. S. Fartoukh, "An Achromatic Telescopic Squeezing (ATS) Scheme for LHC Upgrade", in proceedings of IPAC11, p. 2088.

TUPWO050	Commissioning and Operation at β^* = 1000 m in the LHC	optics, proton, scattering, quadrupole	1982
	H. Burkhardt, T. Persson, R. Tomás, J. Wenninger CERN, Geneva, Switzerland S. Cavalier LAL, Orsay, France
	We have developed a special optics with a β^* of 1000 m for two interaction regions (IR1 and IR5) in the LHC, to produce very low divergence beams required for elastic proton-proton scattering. We describe the design, commissioning and operation of this optics in the LHC. The β^* of 1000 m was reached by de-squeezing the beams using 17 intermediate steps beyond the β^* of 90 m, which had been the previous highest β^* value reached in the LHC. The optics was measured and the beta beating globally corrected to a level of 10 per cent.

WEPWA022	The Fabrication and Measurement of the New Insertion Devices of Hefei Light Source	undulator, vacuum, insertion-device, radiation	2177
	Q.K. Jia USTC/NSRL, Hefei, Anhui, People's Republic of China
	To meet the requirements of users for higher brilliance and good transverse coherence VUV and soft X-ray synchrotron radiation, Hefei Light Source(HLS) will be upgraded. After upgrade HLS will have smaller beam emittance and install more new insertion devices. The new insertion devices include one elliptically polarizing undulator with 10⁴ mm period, one in-vacuum undulator with 40mm period, one wiggler with 152mm period and one quasi-periodic undulator based on a new scheme proposed by us. In this paper the fabrication and the preliminary results of the magnetic field measurements of the new insertion devices are reported.

WEPWA032	The Feed-forward Control Design of Correction Coil Power Supply for SSRF EPU	controls, EPICS, power-supply, undulator	2199
	Q. Yuan, M. Gu, G.Y. Jiang, R. Wang SINAP, Shanghai, People's Republic of China
	The SSRF Elliptically Polarized Undulator (EPU) has been in operation for about three years. The feed-forward control algorithm of correction coil power supply (CCPS) is implemented in the Input and Output Controller (IOC) based on VME. The correction current responds not fast enough to gap movement, mainly because the communication between IOC and digital CCPS taking up much time. This paper introduces one new feed-forward design, that is ,on the one hand, the CCPS current responds to both gap movement and shift movement according to 2D Look-up Table(LUT) by linear interpolation method. On the other hand, feed-forward control algorithm is carried out in the EPU controller, and the CCPS with fast control response is directly controlled by PLC through analog interface. Thus, the correction current respond well to gap and shift movement owing to leaving out communication time.

WEPWA053	Control System of In-vacuum Undulator in Taiwan Photon Source	controls, EPICS, vacuum, undulator	2238
	C.Y. Wu, J. Chen, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, C.Y. Liao NSRRC, Hsinchu, Taiwan
	Insertion device (ID) is a crucial component in third-generation synchrotron light sources, which can produces highly-brilliant, forward-directed and quasi-monochromatic radiation over a broad energy range for various experiments. In the phase I of the Taiwan Photon Source (TPS) project, seven IU22s (In-Vacuum Undulator) will be planned, constructed, and installed. The control system for IU22 is based on the EPICS architecture. The main control components include the motor with encoder for gap adjustment, trimming power supply for corrector magnets, ion pumpers and BA gauges for vacuum system, temperature sensors for ID environmental monitoring and baking, and interlock system (limit switches, emergency button) for safety. The progress of IU22 control system will be summarized in this report.

WEPWA054	Rejuvenation of Control System of the Undulator 50 in Taiwan Light Source	controls, EPICS, undulator, insertion-device	2241
	C.Y. Liao, J. Chen, P.C. Chiu, K.T. Hsu, C.Y. Wu NSRRC, Hsinchu, Taiwan
	The Undulator 50 (U50) for Taiwan Light Source (TLS) was installed on March 1997 at NSRRC. It provides service for more than 15 years. Control system of U50 includes a PC running MS-DOS for local control. Motion controller contains two indexers with driver via RS-232 interface. It equip with IEEE-488 interface to connect to the VME system for remote access. The response time for command and reply is in the order of second, thus the throughput of the experiment for energy scan is time-consuming. New U50 control system will share the standard environment for insertion devices (ID) control for the Taiwan Photon Source (TPS) project. Ethernet based motion controller was chosen to drive motor drivers. All control functionality will coordinate by the cPCI EPICS IOC. To compatible with TLS existed control environment, a server program was develop to translate the protocol to EPICS PVs. All existed GUI of TLS still can be used. These improvements of control system for U50 are essential upgrading geared to avoid obsolescence of the control related parts, increase productivity and support on-the-fly experiments. The progress of the controls plan will be summarized in this report.

WEPWA086	Characterization of PrFeB Permanent Magnet Blocks with Helmholtz Coils at NSLS-II	undulator, cryogenics, dipole, permanent-magnet	2304
	P. He, P.L. Cappadoro, T.M. Corwin, H.C. Fernandes, D.A. Harder, C.A. Kitegi, M.M. Musardo, G. Rakowsky, J. Rank, T. Tanabe BNL, Upton, Long Island, New York, USA M. Kokole KYTE, Sezana, Slovenia
	For investigatation to build the cryogenic undulator using bake-able Praseodymium-Iron-Boron(PrFeB) magnet blocks, a short period(16.8mm) and fixed gap(5mm) hybrid undulator prototype has been fabricated at BNL. For this undulator, 36 PrFeB magnet blocks(28 type A, 4 type B, 4 type C) are used. The magnetic field characteristics of the undulator heavily depend on the directional uniformity of the magnetization of block sets. The strength and direction of magnetization of the PrFeB magnet blocks are measured using a Helmholtz coil system. The data include the three vector components of the total magnetic dipole moment of the blocks and also compare with vendor measuremeant results.

WEPEA048	Specification of a System of Correctors for the Triplets and Separation Dipoles of the LHC Upgrade	multipole, dipole, simulation, optics	2612
	M. Giovannozzi, R. De Maria, S.D. Fartoukh CERN, Geneva, Switzerland
	Funding: The HiLumi LHC Design Study is included in the HL-LHC project and is partly funded by the European Commission within the Framework Programme 7 Capacities Specific Programme, Grant Agreement 284404. The luminosity upgrade of the LHC aims at reducing β^* from 55 cm to 15 cm or beyond. This can be achieved by the ATS* scheme and means of new large aperture superconducting triplet (IT) quadrupoles (150 mm), preferably using the Nb3Sn technology in order to keep the gradient reasonably high (140 T/m). The field quality requires careful specification in order to ensure a large enough dynamic aperture. In this context, dedicated corrector magnets are foreseen to provide semi-local corrections of specific multipole components and find the best possible compromise between the demand and what can be realistically achieved by the magnet manufacturer. In this paper the layout and main parameters of the IT corrector package are presented together with the correction strategy. Moreover, the foreseen performance is discussed in detail. * S. Fartoukh, ‘’An Achromatic Telescopic Squeezing (ATS) Scheme for LHC Upgrade’’, in proceedings of IPAC11, p. 2088.

WEPEA079	A New Method to Integrate s-dependent Hamiltonian	insertion-device, undulator, beam-transport, focusing	2693
	W. Guo BNL, Upton, Long Island, New York, USA
	Funding: Work supported by U.S. DOE, Contract No. DE-AC02-98CH10886 The present theory to obtain higher order terms of beam dynamics is mostly through Taylor expansion and differentiation, for example, the Lie transformation. When 3-dimensional Hamiltonian is being considered the operation of integration becomes necessary. In this paper we will present a new integration theory, which leads to transfer maps for common accelerator elements based on 3-d Hamiltonians. Some physics insight was also gained from this theory, for example, the kick-map theory which is used for insertion device design and modeling, is a first-order approximation in our approach.

WEPFI002	Acceptance Tests for the Spiral2 SC Linac RF Power Systems	cavity, linac, impedance, controls	2702
	M. Di Giacomo GANIL, Caen, France
	Funding: This activity received founds from the EuCard RF Tech program The Spiral2 SC linac uses solid state amplifiers ranging from 2,5 to 19 kW and external circulators to drive normal and superconducting cavities at 88.0525 MHz. The project has no manpower for in house development and all power devices are ordered to commercial companies. Robust acceptance tests have therefore been defined to check reliability with respect to our application. The papers describes the tests procedure and results on our first units.

WEPFI067	FETS RF System Design and Circulator Testing	rfq, klystron, shielding, ion	2851
	S.M.H. Alsari, J.K. Pozimski, P. Savage Imperial College of Science and Technology, Department of Physics, London, United Kingdom M. Dudman, A.P. Letchford STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
	The Front End Test Stand (FETS) is an experiment based at the Rutherford Appleton Laboratory (RAL) in the UK. In this experiment, the first stages necessary to produce a very high quality, chopped H⁻ ion beam as required for the next generation of high power proton accelerators (HPPAs) are designed, built and tested. HPPAs with beam powers in the megawatt range have many possible applications including drivers for spallation neutron sources, neutrino factories, accelerator driven sub-critical systems, waste transmuters and tritium production facilities. RF system outline and design options of the waveguide and coaxial parts and shielding are presented and discussed in this paper. Experimental measurements of the system’s circulator will be presented as part of the system testing results.

THPEA006	!CHAOS Historical Engine	controls, simulation	3158
	M. Mara, A. Paoletti Istituto Nazionale di Fisica Nucleare, Amministrazione Centrale, Frascati, Italy C. Bisegni, G. Di Pirro, L.G. Foggetta, G. Mazzitelli, A. Stecchi INFN/LNF, Frascati (Roma), Italy L. Catani, F. Zani INFN-Roma II, Roma, Italy
	!CHAOS is an INFN project aimed at creating the communication framework and the services needed for the definition of a new control system standard, mainly addressed to large experimental apparatus and particle accelerators. !CHAOS is under test at DAΦNE accelerator and has been developed to overcome the strong requirements throughput of new accelerators, like superB. One of the main components of the framework is the historical engine (HST Engine), a cloud-like environment optimized for the fast storage of large amount of data produced by the control system’s devices and services (I/O channels, alerts, commands, events, etc.), each with its own storage and aging rule. The HST subsystem is designed to be highly customizable, such to adapt to any desirable data storage technologies, database architecture, indexing strategy and fully scalable in each part. The architecture of HST Engine and the results of preliminary tests for the evaluation of performance are presented.

THPEA028	Embedded EPICS Controller in Inserting Devices of SSRF	EPICS, controls, PLC, insertion-device	3204
	G.Y. Jiang SSRF, Shanghai, People's Republic of China G.H. Chen SINAP, Shanghai, People's Republic of China
	SSRF is the first homemade third-generation of synchrotron radiation light source in China. In the first stage of SSRF, 7 beamlines have been built. Among of them, 5 beamlines have used inserting devices (IDs) including both of wigglers and undulators. To support stable and long life beam, the control part of these IDs must focus on high stability and high precision. Thus, Simens PLC, which has been widely used in industrial control fields, was used as local device controllers to control the motors. About upper layer control, we adopted a kind of embedded EPICS controller to implement the control of correction coil power supplies and PLC. This embedded EPICS controller is based on a commercial Ethernet/Serial converter which running MontaVista linux as its operation system. Beyond this, EPICS IOC Core program and several kinds of device control drivers were integrated to it. After several months using, the whole system works stably. Details of the necessary integration work and operation performance will be discussed in this paper.

THPFI023	A Newly Developed High Directivity X-band Waveguide Directional Coupler	simulation, coupling, pick-up, vacuum	3345
	X. He, X. Wang, F. Zhao IHEP, Beijing, People's Republic of China
	A new X-band waveguide directional coupler working at 11.9924 GHZ is designed. Four holes symmetrical to the structure is drilled along the central line of the narrow-wall, which is used to couple the electromagnetic power from the main-waveguide to the sub-waveguide. The final prototype has got a measurement result of 32.2 dB Directivity (-47.0 dB Coupling Degree) together with a very low VSWR (1.067) and Insertion Loss (-0.11 dB) at 11.9924 GHz. The vacuum performance is also qualified.

THPFI063	Development and Beam Tests of an Automatic Algorithm for Alignment of LHC Collimators with Embedded BPMs	alignment, pick-up, controls, collimation	3439
	G. Valentino University of Malta, Information and Communication Technology, Msida, Malta R.W. Aßmann DESY, Hamburg, Germany R. Bruce, M. Gasior, D. Mirarchi, A.A. Nosych, S. Redaelli, B. Salvachua, N.J. Sammut CERN, Geneva, Switzerland
	Collimators with embedded Beam Position Monitor (BPM) buttons will be installed in the LHC during the upcoming long shutdown period. During the subsequent operation, the BPMs will allow the collimator jaws to be kept centered around the beam trajectory. In this manner, the best possible beam cleaning efficiency and machine protection can be provided at unprecedented higher beam energies and intensities. A collimator alignment algorithm is proposed to center the jaws automatically around the beam. The algorithm is based on successive approximation, as the BPM measurements are affected by non-linearities, which vary with the distance between opposite buttons, as well as the difference between the beam and the jaw centers. The successful test results, as well as some considerations for eventual operation in the LHC are also presented.

THPFI072	Heat Transfer Analysis of a Water-cooled Channel for the TPS Front End Components	simulation, synchrotron, synchrotron-radiation, radiation	3466
	C.K. Kuan, J.-R. Chen, Y.T. Cheng, J.Y. Chuang, H.Y. Lin, P.A. Lin, Y.K. Liu, I.C. Sheng, T.C. Tseng NSRRC, Hsinchu, Taiwan J.-R. Chen National Tsing Hua University, Hsinchu, Taiwan
	The masks, absorbers and slits must withstand the extremely high power and power density in the TPS front end. The material always used is OFHC or Glidcop. One solution is to increase the cooling efficiency of the water-cooled channel in these components. With the restrictions of water pressure < 7 kg/cm² and water flow velocity < 3 m/s, the wire coil is chosen to enhance the average heat- transfer coefficient and increase not too much the loss of water pressure. With a water channel of diameter 7.5 mm and wire coil inserts of pitch 7.5 mm and wire diameter 1 mm, the cooling efficiency becomes enhanced 1.4 to 2 times in the components of the TPS front end. The wire coils of varied pitches are simulated and calculated in this work. We also compare our investigated data with other experimental data of other authors.

THPFI090	Accuracy of Measurements of ε and μ of Lossy Materials	HOM, simulation, higher-order-mode, damping	3499
	V.D. Shemelin, J.J. Kaufman CLASSE, Ithaca, New York, USA
	Funding: NSF award DMR-0807731 Measurements of samples of lossy ceramic and ferrites for Higher Order Mode Loads are performed routinely in our Lab. Some difference of results for different batches of materials can be explained not only by technological deviations in the material production but also by errors in the dimensions of the measured samples. Simulations with MicroWave Studio for samples in the form of coaxial washers in the frequency range from 1 to 12.4 GHz helped to define the main sources of errors and to improve accuracy of measurements.

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Other Keywords

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MOPEA024

Effects of Insertion Devices in the High Field Lattice Structure of ILSF Storage Ring

dynamic-aperture, insertion-device, quadrupole, radiation

124

F. Saeidi, E. Ahmadi, H. Ghasem
ILSF, Tehran, Iran
H. Ghasem
IPM, Tehran, Iran

We have studied effects of different insertion devices(IDs) in the high filed ILSF storage ring. Radiation from the IDs leads to change emittance and energy spread of the ring and magnetic field of them results to beta-beating, tune shift and shrink of dynamic aperture. This paper describes effects of the IDs on beam parameters of the high field lattice structure of ILSF storage ring and proposes the compensation method of these effects.
farhad.saeidi@ipm.ir

MOPEA049

The First Experience of PLS-II Operation

injection, linac, storage-ring, lattice

190

S.H. Nam, M.-H. Cho, J.Y. Huang, C.D. Park, S. Shin
PAL, Pohang, Kyungbuk, Republic of Korea

Funding: Mministry of Education, Science and Technology (MEST) of Korea
One of recent major activities of the Pohang Accelerator Laboratory (PAL) in Korea has been PLS-II user operation. The PLS-II is a Korea’s only and brand new 3rd generation synchrotron radiation source that was upgraded from the 16-year-old PLS in 2011. The old PLS started user service from 1995 and shutdown on Dec. 10, 2010. The PLS-II has been open to users from March 2012 with upgraded performance. The performance parameters of the PLS-II are 5.8 nm-rad emittance, 3.0GeV beam energy, and 400mA beam current with the top-up injection. The unique feature of PLS-II will be the implementation of 20 insertion-devices in a compact double-bend-achromat storage ring of 280m-long circumference. Among 20 insertion-devices, 14 are in-vacuum undulators. The first year operation in 2012 will be successfully completed and the operational statistics will be summarized and discussed.

MOPEA051

Insertion Devices Influence on the Beam Dynamics at Siberia-2 Storage Ring

dynamic-aperture, undulator, wiggler, insertion-device

193

S.I. Tomin, V. Korchuganov
NRC, Moscow, Russia

Siberia-2 is now running with 7.5 T wiggler and the installation of additional two 3 T SC wigglers is under consideration. Besides that the insertion of an undulator with very short period up to 7 mm is planed. We studied an influence of the insertion devices on the dynamic aperture using new computer code which permits to find an electron beam trajectory in ID by Runge-Kutta integrator. Using two independent approaches it was shown that ID introduces the nonlinear components of magnetic field which lead to significant decrease of dynamic aperture in vertical direction. Nonlinear components of ID magnetic field are shown. Results of numerical calculation of Siberia-2 dynamic aperture are presented as well.

MOPEA059

The Optimization of Transverse Stripline Kicker

kicker, simulation, vacuum, impedance

214

H.P. Hsueh, C.-C. Chang, Y.P. Chang, J.-R. Chen, Y.T. Cheng, G.-Y. Hsiung, Y.C. Yang
NSRRC, Hsinchu, Taiwan
J.-R. Chen
National Tsing Hua University, Hsinchu, Taiwan

The construction of a new 3 GeV synchrotron facility, Taiwan Photon Source, is ongoing. It is required to install stripline kickers to suppress instability generated by mismatch between injection kickers or imperfect installation of vacuum components all around. First, the design philosophy will be described for transverse stripline kickers. HFSS electromagnetic simulation software is used to optimize all structure parameters like electrode dimensions, electrode distance from vacuum chambers etc. to make transverse stripline kicker working more efficiently and effectively. All simulation results will be presented in this paper and all structure dimension choices will be discussed and the final prototype structure dimensions will be selected from the discussion.

MOPEA075

Completion of the Brightness Upgrade of the ALS

lattice, brightness, emittance, sextupole

261

C. Steier, B.J. Bailey, K. Berg, A. Biocca, A.T. Black, P.W. Casey, D. Colomb, R.F. Gunion, N. Li, A. Madur, S. Marks, H. Nishimura, G.C. Pappas, K.V. Petermann, G.J. Portmann, S. Prestemon, A.W. Rawlins, D. Robin, S.L. Rossi, T. Scarvie, D. Schlueter, C. Sun, H. Tarawneh, W. Wan, E.C. Williams
LBNL, Berkeley, California, USA
C. Chen, J. Jin, Y.M. Wen, J. Wu, L. Yin, J.D. Zhang, Q.G. Zhou
SINAP, Shanghai, People's Republic of China

Funding: The Advanced Light Source is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
The Advanced Light Source (ALS) at Berkeley Lab remains one of the brightest sources for soft x-rays worldwide. A multiyear upgrade of the ALS is underway, which includes new and replacement x-ray beamlines, a replacement of many of the original insertion devices and many upgrades to the accelerator. The accelerator upgrade that affects the ALS performance most directly is the ALS brightness upgrade, which reduced the horizontal emittance from 6.3 to 2.0 nm (2.5 nm effective). Magnets for this upgrade were installed starting in 2012 followed by a transition to user operations with 2.0 nm emittance in spring 2013.

MOPWO027

Improved TEAPOT Method and Tracking with Thick Quadrupoles for the LHC and its Upgrade

quadrupole, optics, lattice, multipole

945

H. Burkhardt, R. De Maria, M. Giovannozzi, T. Risselada
CERN, Geneva, Switzerland

The comparison between tracking with thick and thin lens models for the LHC have been studied. A widely-used method to generate thin models is based on the TEAPOT slicing, which, in the original implementation is limited in the number of slices. In this paper an improved method is presented, which overcomes some of the limitations of the original TEAPOT. The performance is analysed and the impact on numerical simulation of the dynamic aperture is evaluated, both for the LHC and its upgrade, HL-LHC.

MOPWO035

Layouts for Crystal Collimation Tests at the LHC

collimation, simulation, optics, proton

966

D. Mirarchi, S. Redaelli, W. Scandale
CERN, Geneva, Switzerland
D. Mirarchi
The Imperial College of Science, Technology and Medicine, London, United Kingdom
V. Previtali
Fermilab, Batavia, USA

Various studies have been carried out in the past years regarding crystal collimation for the LHC. A new extensive campaign of simulations was performed to determine optimum layouts for beam tests at the LHC. The layouts are determined based on semi-analytical models for the dynamics of channeled particles. Detailed SixTrack tracking with all collimators of the ring are then used to validate the different options. An overview of the ongoing studies is given. Comparative studies between the present collimation system, the crystal collimation system, and different crystal collimation layout are presented.

MOPWO040

Analysis of Failures of the LHC Collimators during the 2010-2013 Operation

collimation, injection, controls, luminosity

981

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

The LHC collimation system must be available in all phases of the machine operation in order to handle the high stored beam energies. The system availability is therefore crucial to achieve an efficient LHC operation. The collimation system has proved to work reliably in the first years of LHC operation, with total stored energies up to 140 MJ. The impact on the machine availability has been limited. The analysis of collimation system availability and the failure rate in the years 2012-2012 is reviewed with the aim to identify possible further improvements for the future.

MOPWO048

Cleaning Performance of the LHC Collimation System up to 4 TeV

alignment, collimation, betatron, beam-losses

1002

B. Salvachua, R.W. Aßmann, R. Bruce, M. Cauchi, D. Deboy, L. Lari, A. Marsili, D. Mirarchi, E. Quaranta, S. Redaelli, A. Rossi, G. Valentino
CERN, Geneva, Switzerland
M. Cauchi
UoM, Msida, Malta
L. Lari
IFIC, Valencia, Spain
D. Mirarchi
The Imperial College of Science, Technology and Medicine, London, United Kingdom
G. Valentino
University of Malta, Information and Communication Technology, Msida, Malta

Funding: Research supported by EU FP7 HiLumi LHC (Grant agreement 284404)
In this paper we review the performance of the LHC collimation system during 2012 and compare it with previous years. During 2012, the so-called tight settings were deployed for a better cleaning and improved beta-star reach. As a result, a record cleaning efficiency below a few 0.0001 was achieved in the cold regions where the highest beam losses occur. The cleaning in other cold locations is typically a factor of 10 better. No quenches were observed during regular operation with up to 140 MJ stored beam energy. The system stability during the year, monitored regularly to ensure the system functionality for all machine configurations, and the performance of the alignment tools are also reviewed.

MOPWO051

Estimate of Warm Magnets Lifetime in the Betatron and Momentum Cleaning Insertions of the LHC

luminosity, betatron, collimation, radiation

1011

B. Salvachua, R. Bruce, M. Brugger, F. Cerutti, S. Redaelli
CERN, Geneva, Switzerland

The CERN LHC collimation system is designed to perform momentum and betatron cleaning in different insertions, respectively IR3 and IR7. The insertions are not perfectly decoupled because the dispersion in IR7 is not null and the beta function in IR3 is not zero. The detailed sharing of losses between the two insertions depends on the relative collimator settings as observed by the change between 2011 and 2012 LHC operation. In this report, using the beam loss measurements at the primary collimators of IR3 and IR7, the total BLM losses in the two insertions are calculated and compared to each other. These studies are also used to quantify the total dose to warm magnets in those IRs with the aim to understand better their lifetime and the implications of the radiation to electronics. This will be of particular importance in view of LHC operating at nominal performance after several years of operation.

TUODB203

Dual Chip in Single Module Solid-State Power Amplifier Design for Compact Transmitter Architecture

impedance, storage-ring, booster, linac

1158

T.-C. Yu, L.-H. Chang, M.H. Chang, L.J. Chen, F.-T. Chung, M.-C. Lin, Y.-H. Lin, Z.L. Liu, C.H. Lo, M.H. Tsai, Ch. Wang, T.-T. Yang, M.-S. Yeh
NSRRC, Hsinchu, Taiwan

At present, the high power solid-state technique transmitter design are composed of hundreds parallel combined single chip for hundreds Watts power modules to achieve enough output power. Although the large numbers can bring high redundancy during system operation, the power hungry of next generation RF system of accelerator would need much more modules to reach its power requirement. Huge amount of power modules would bring the complexity and difficulty in power combining, system construction, management and maintenance. To overcome this problem, upgrading the power level of a single module could be the solution. Besides depending on the power level growing with technology advancement in semiconductor industry, a circuit level solution to combine dual chip in advance in a single PCB board is proposed to produce twice power as single chip. Such feasible solution can overcome the over-complexity of future several-hundreds kW solid-state transmitter design.

Slides TUODB203 [2.337 MB]

TUPFI015

Study of the IR2 and IR8 Squeezeability for HL-LHC Upgrade

optics, injection, quadrupole, luminosity

1361

A.V. Bogomyagkov
BINP SB RAS, Novosibirsk, Russia
R. De Maria
CERN, Geneva, Switzerland

Funding: The HiLumi LHC Design Study is included in the HL-LHC project and is partly funded by the European Commission within the Framework Programme 7 Capacities Specific Programme, Grant Agreement 284404.
The paper presents the results of the study of different optics configurations which allow to reach smaller beta functions at the IP2 and IP8 in the framework of the HL-LHC project. The variants at collision energies must be compatible with the ATS* scheme which provides small beta function at the IP1 and IP5 or provide low beta function for Alice and LHCb during ion operatations. The ones at injection must satisfy injection transfer lines and aperture constraints. The final goal is to find the overlap between the phase advances of all the configuration for IR2 and IR8 respectively, in order to mainting the LHC working point without rematching the remaining insertions.
* S. Fartoukh, ‘’An Achromatic Telescopic Squeezing (ATS) Scheme for LHC Upgrade’’, in proceedings of IPAC11, p. 2088.

TUPFI049

Studies of 10 GeV Decay Ring Design for the International Design Study of the Neutrino Factory

injection, kicker, optics, storage-ring

1457

D.J. Kelliher, C.R. Prior
STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
N. Bliss, N.A. Collomb
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
A. Kurup, J. Pasternak
Imperial College of Science and Technology, Department of Physics, London, United Kingdom
J. Pasternak
STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
H. Witte
BNL, Upton, Long Island, New York, USA

Due to the discovery of large θ13 the final muon storage energy in the baseline solution of International Design Study for the Neutrino Factory (IDS-NF) has been set at 10 GeV. A new racetrack design has been produced for the decay ring to meet this requirement. The details of lattice design and the beam dynamics calculations are discussed. The feasibility of the injection system for both positive and negative muons into the ring is explored in details.

TUPFI051

Optics Transition between Injection and Collision Optics for the HL-LHC Upgrade Project

quadrupole, optics, injection, luminosity

1460

M. Korostelev, A. Wolski
The University of Liverpool, Liverpool, United Kingdom
R. De Maria, S.D. Fartoukh
CERN, Geneva, Switzerland
M. Korostelev, A. Wolski
Cockcroft Institute, Warrington, Cheshire, United Kingdom

Funding: The HiLumi LHC Design Study is included in the HL-LHC project and is partly funded by the European Commission within the Framework Programme 7 Capacities Specific Programme, Grant Agreement 284404.
Plans for the luminosity upgrade of the LHC collider at CERN (HL-LHC) are based on implementation of magnets with larger apertures in the interaction regions, together with the ATS [*] technique to reach very low values of the beta function at the collision points. The transition from injection to collision optics will be carried out in two stages, and will involve varying the strengths of the quadrupoles within the straight sections. Solutions for the optics transition have to meet a variety of challenging constraints, including constraints on the phase advances and Twiss parameters throughout the straights involved in the transition, specified minimum and maximum strengths of the quadrupoles, etc. Moreover, to minimize the time taken for the transition, the variation of the quadrupole strengths should be as smooth as possible, especially for the strongest quadrupoles. Avoiding changes of slope as much as possible will also minimize hysteresis effects in the super-conducting matching quadrupoles participating to the process. This paper presents one possible solution for the optics transition, calculated for the HLLHCv1.0 version of the optics and layout of the HL-LHC.
* S. Fartoukh, "An Achromatic Telescopic Squeezing (ATS) Scheme for LHC Upgrade", in proceedings of IPAC11, p. 2088.

TUPWO050

Commissioning and Operation at β^* = 1000 m in the LHC

optics, proton, scattering, quadrupole

1982

H. Burkhardt, T. Persson, R. Tomás, J. Wenninger
CERN, Geneva, Switzerland
S. Cavalier
LAL, Orsay, France

We have developed a special optics with a β^* of 1000 m for two interaction regions (IR1 and IR5) in the LHC, to produce very low divergence beams required for elastic proton-proton scattering. We describe the design, commissioning and operation of this optics in the LHC. The β^* of 1000 m was reached by de-squeezing the beams using 17 intermediate steps beyond the β^* of 90 m, which had been the previous highest β^* value reached in the LHC. The optics was measured and the beta beating globally corrected to a level of 10 per cent.

WEPWA022

The Fabrication and Measurement of the New Insertion Devices of Hefei Light Source

undulator, vacuum, insertion-device, radiation

2177

Q.K. Jia
USTC/NSRL, Hefei, Anhui, People's Republic of China

To meet the requirements of users for higher brilliance and good transverse coherence VUV and soft X-ray synchrotron radiation, Hefei Light Source(HLS) will be upgraded. After upgrade HLS will have smaller beam emittance and install more new insertion devices. The new insertion devices include one elliptically polarizing undulator with 10⁴ mm period, one in-vacuum undulator with 40mm period, one wiggler with 152mm period and one quasi-periodic undulator based on a new scheme proposed by us. In this paper the fabrication and the preliminary results of the magnetic field measurements of the new insertion devices are reported.

WEPWA032

The Feed-forward Control Design of Correction Coil Power Supply for SSRF EPU

controls, EPICS, power-supply, undulator

2199

Q. Yuan, M. Gu, G.Y. Jiang, R. Wang
SINAP, Shanghai, People's Republic of China

The SSRF Elliptically Polarized Undulator (EPU) has been in operation for about three years. The feed-forward control algorithm of correction coil power supply (CCPS) is implemented in the Input and Output Controller (IOC) based on VME. The correction current responds not fast enough to gap movement, mainly because the communication between IOC and digital CCPS taking up much time. This paper introduces one new feed-forward design, that is ,on the one hand, the CCPS current responds to both gap movement and shift movement according to 2D Look-up Table(LUT) by linear interpolation method. On the other hand, feed-forward control algorithm is carried out in the EPU controller, and the CCPS with fast control response is directly controlled by PLC through analog interface. Thus, the correction current respond well to gap and shift movement owing to leaving out communication time.

WEPWA053

Control System of In-vacuum Undulator in Taiwan Photon Source

controls, EPICS, vacuum, undulator

2238

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

Insertion device (ID) is a crucial component in third-generation synchrotron light sources, which can produces highly-brilliant, forward-directed and quasi-monochromatic radiation over a broad energy range for various experiments. In the phase I of the Taiwan Photon Source (TPS) project, seven IU22s (In-Vacuum Undulator) will be planned, constructed, and installed. The control system for IU22 is based on the EPICS architecture. The main control components include the motor with encoder for gap adjustment, trimming power supply for corrector magnets, ion pumpers and BA gauges for vacuum system, temperature sensors for ID environmental monitoring and baking, and interlock system (limit switches, emergency button) for safety. The progress of IU22 control system will be summarized in this report.

WEPWA054

Rejuvenation of Control System of the Undulator 50 in Taiwan Light Source

controls, EPICS, undulator, insertion-device

2241

C.Y. Liao, J. Chen, P.C. Chiu, K.T. Hsu, C.Y. Wu
NSRRC, Hsinchu, Taiwan

The Undulator 50 (U50) for Taiwan Light Source (TLS) was installed on March 1997 at NSRRC. It provides service for more than 15 years. Control system of U50 includes a PC running MS-DOS for local control. Motion controller contains two indexers with driver via RS-232 interface. It equip with IEEE-488 interface to connect to the VME system for remote access. The response time for command and reply is in the order of second, thus the throughput of the experiment for energy scan is time-consuming. New U50 control system will share the standard environment for insertion devices (ID) control for the Taiwan Photon Source (TPS) project. Ethernet based motion controller was chosen to drive motor drivers. All control functionality will coordinate by the cPCI EPICS IOC. To compatible with TLS existed control environment, a server program was develop to translate the protocol to EPICS PVs. All existed GUI of TLS still can be used. These improvements of control system for U50 are essential upgrading geared to avoid obsolescence of the control related parts, increase productivity and support on-the-fly experiments. The progress of the controls plan will be summarized in this report.

WEPWA086

Characterization of PrFeB Permanent Magnet Blocks with Helmholtz Coils at NSLS-II

undulator, cryogenics, dipole, permanent-magnet

2304

P. He, P.L. Cappadoro, T.M. Corwin, H.C. Fernandes, D.A. Harder, C.A. Kitegi, M.M. Musardo, G. Rakowsky, J. Rank, T. Tanabe
BNL, Upton, Long Island, New York, USA
M. Kokole
KYTE, Sezana, Slovenia

For investigatation to build the cryogenic undulator using bake-able Praseodymium-Iron-Boron(PrFeB) magnet blocks, a short period(16.8mm) and fixed gap(5mm) hybrid undulator prototype has been fabricated at BNL. For this undulator, 36 PrFeB magnet blocks(28 type A, 4 type B, 4 type C) are used. The magnetic field characteristics of the undulator heavily depend on the directional uniformity of the magnetization of block sets. The strength and direction of magnetization of the PrFeB magnet blocks are measured using a Helmholtz coil system. The data include the three vector components of the total magnetic dipole moment of the blocks and also compare with vendor measuremeant results.

WEPEA048

Specification of a System of Correctors for the Triplets and Separation Dipoles of the LHC Upgrade

multipole, dipole, simulation, optics

2612

M. Giovannozzi, R. De Maria, S.D. Fartoukh
CERN, Geneva, Switzerland

Funding: The HiLumi LHC Design Study is included in the HL-LHC project and is partly funded by the European Commission within the Framework Programme 7 Capacities Specific Programme, Grant Agreement 284404.
The luminosity upgrade of the LHC aims at reducing β^* from 55 cm to 15 cm or beyond. This can be achieved by the ATS* scheme and means of new large aperture superconducting triplet (IT) quadrupoles (150 mm), preferably using the Nb3Sn technology in order to keep the gradient reasonably high (140 T/m). The field quality requires careful specification in order to ensure a large enough dynamic aperture. In this context, dedicated corrector magnets are foreseen to provide semi-local corrections of specific multipole components and find the best possible compromise between the demand and what can be realistically achieved by the magnet manufacturer. In this paper the layout and main parameters of the IT corrector package are presented together with the correction strategy. Moreover, the foreseen performance is discussed in detail.
* S. Fartoukh, ‘’An Achromatic Telescopic Squeezing (ATS) Scheme for LHC Upgrade’’, in proceedings of IPAC11, p. 2088.

WEPEA079

A New Method to Integrate s-dependent Hamiltonian

insertion-device, undulator, beam-transport, focusing

2693

W. Guo
BNL, Upton, Long Island, New York, USA

Funding: Work supported by U.S. DOE, Contract No. DE-AC02-98CH10886
The present theory to obtain higher order terms of beam dynamics is mostly through Taylor expansion and differentiation, for example, the Lie transformation. When 3-dimensional Hamiltonian is being considered the operation of integration becomes necessary. In this paper we will present a new integration theory, which leads to transfer maps for common accelerator elements based on 3-d Hamiltonians. Some physics insight was also gained from this theory, for example, the kick-map theory which is used for insertion device design and modeling, is a first-order approximation in our approach.

WEPFI002

Acceptance Tests for the Spiral2 SC Linac RF Power Systems

cavity, linac, impedance, controls

2702

M. Di Giacomo
GANIL, Caen, France

Funding: This activity received founds from the EuCard RF Tech program
The Spiral2 SC linac uses solid state amplifiers ranging from 2,5 to 19 kW and external circulators to drive normal and superconducting cavities at 88.0525 MHz. The project has no manpower for in house development and all power devices are ordered to commercial companies. Robust acceptance tests have therefore been defined to check reliability with respect to our application. The papers describes the tests procedure and results on our first units.

WEPFI067

FETS RF System Design and Circulator Testing

rfq, klystron, shielding, ion

2851

S.M.H. Alsari, J.K. Pozimski, P. Savage
Imperial College of Science and Technology, Department of Physics, London, United Kingdom
M. Dudman, A.P. Letchford
STFC/RAL, Chilton, Didcot, Oxon, United Kingdom

The Front End Test Stand (FETS) is an experiment based at the Rutherford Appleton Laboratory (RAL) in the UK. In this experiment, the first stages necessary to produce a very high quality, chopped H⁻ ion beam as required for the next generation of high power proton accelerators (HPPAs) are designed, built and tested. HPPAs with beam powers in the megawatt range have many possible applications including drivers for spallation neutron sources, neutrino factories, accelerator driven sub-critical systems, waste transmuters and tritium production facilities. RF system outline and design options of the waveguide and coaxial parts and shielding are presented and discussed in this paper. Experimental measurements of the system’s circulator will be presented as part of the system testing results.

THPEA006

!CHAOS Historical Engine

controls, simulation

3158

M. Mara, A. Paoletti
Istituto Nazionale di Fisica Nucleare, Amministrazione Centrale, Frascati, Italy
C. Bisegni, G. Di Pirro, L.G. Foggetta, G. Mazzitelli, A. Stecchi
INFN/LNF, Frascati (Roma), Italy
L. Catani, F. Zani
INFN-Roma II, Roma, Italy

!CHAOS is an INFN project aimed at creating the communication framework and the services needed for the definition of a new control system standard, mainly addressed to large experimental apparatus and particle accelerators. !CHAOS is under test at DAΦNE accelerator and has been developed to overcome the strong requirements throughput of new accelerators, like superB. One of the main components of the framework is the historical engine (HST Engine), a cloud-like environment optimized for the fast storage of large amount of data produced by the control system’s devices and services (I/O channels, alerts, commands, events, etc.), each with its own storage and aging rule. The HST subsystem is designed to be highly customizable, such to adapt to any desirable data storage technologies, database architecture, indexing strategy and fully scalable in each part. The architecture of HST Engine and the results of preliminary tests for the evaluation of performance are presented.

THPEA028

Embedded EPICS Controller in Inserting Devices of SSRF

EPICS, controls, PLC, insertion-device

3204

G.Y. Jiang
SSRF, Shanghai, People's Republic of China
G.H. Chen
SINAP, Shanghai, People's Republic of China

SSRF is the first homemade third-generation of synchrotron radiation light source in China. In the first stage of SSRF, 7 beamlines have been built. Among of them, 5 beamlines have used inserting devices (IDs) including both of wigglers and undulators. To support stable and long life beam, the control part of these IDs must focus on high stability and high precision. Thus, Simens PLC, which has been widely used in industrial control fields, was used as local device controllers to control the motors. About upper layer control, we adopted a kind of embedded EPICS controller to implement the control of correction coil power supplies and PLC. This embedded EPICS controller is based on a commercial Ethernet/Serial converter which running MontaVista linux as its operation system. Beyond this, EPICS IOC Core program and several kinds of device control drivers were integrated to it. After several months using, the whole system works stably. Details of the necessary integration work and operation performance will be discussed in this paper.

THPFI023

A Newly Developed High Directivity X-band Waveguide Directional Coupler

simulation, coupling, pick-up, vacuum

3345

X. He, X. Wang, F. Zhao
IHEP, Beijing, People's Republic of China

A new X-band waveguide directional coupler working at 11.9924 GHZ is designed. Four holes symmetrical to the structure is drilled along the central line of the narrow-wall, which is used to couple the electromagnetic power from the main-waveguide to the sub-waveguide. The final prototype has got a measurement result of 32.2 dB Directivity (-47.0 dB Coupling Degree) together with a very low VSWR (1.067) and Insertion Loss (-0.11 dB) at 11.9924 GHz. The vacuum performance is also qualified.

THPFI063

Development and Beam Tests of an Automatic Algorithm for Alignment of LHC Collimators with Embedded BPMs

alignment, pick-up, controls, collimation

3439

G. Valentino
University of Malta, Information and Communication Technology, Msida, Malta
R.W. Aßmann
DESY, Hamburg, Germany
R. Bruce, M. Gasior, D. Mirarchi, A.A. Nosych, S. Redaelli, B. Salvachua, N.J. Sammut
CERN, Geneva, Switzerland

Collimators with embedded Beam Position Monitor (BPM) buttons will be installed in the LHC during the upcoming long shutdown period. During the subsequent operation, the BPMs will allow the collimator jaws to be kept centered around the beam trajectory. In this manner, the best possible beam cleaning efficiency and machine protection can be provided at unprecedented higher beam energies and intensities. A collimator alignment algorithm is proposed to center the jaws automatically around the beam. The algorithm is based on successive approximation, as the BPM measurements are affected by non-linearities, which vary with the distance between opposite buttons, as well as the difference between the beam and the jaw centers. The successful test results, as well as some considerations for eventual operation in the LHC are also presented.

THPFI072

Heat Transfer Analysis of a Water-cooled Channel for the TPS Front End Components

simulation, synchrotron, synchrotron-radiation, radiation

3466

C.K. Kuan, J.-R. Chen, Y.T. Cheng, J.Y. Chuang, H.Y. Lin, P.A. Lin, Y.K. Liu, I.C. Sheng, T.C. Tseng
NSRRC, Hsinchu, Taiwan
J.-R. Chen
National Tsing Hua University, Hsinchu, Taiwan

The masks, absorbers and slits must withstand the extremely high power and power density in the TPS front end. The material always used is OFHC or Glidcop. One solution is to increase the cooling efficiency of the water-cooled channel in these components. With the restrictions of water pressure < 7 kg/cm² and water flow velocity < 3 m/s, the wire coil is chosen to enhance the average heat- transfer coefficient and increase not too much the loss of water pressure. With a water channel of diameter 7.5 mm and wire coil inserts of pitch 7.5 mm and wire diameter 1 mm, the cooling efficiency becomes enhanced 1.4 to 2 times in the components of the TPS front end. The wire coils of varied pitches are simulated and calculated in this work. We also compare our investigated data with other experimental data of other authors.

THPFI090

Accuracy of Measurements of ε and μ of Lossy Materials

HOM, simulation, higher-order-mode, damping

3499

V.D. Shemelin, J.J. Kaufman
CLASSE, Ithaca, New York, USA

Funding: NSF award DMR-0807731
Measurements of samples of lossy ceramic and ferrites for Higher Order Mode Loads are performed routinely in our Lab. Some difference of results for different batches of materials can be explained not only by technological deviations in the material production but also by errors in the dimensions of the measured samples. Simulations with MicroWave Studio for samples in the form of coaxial washers in the frequency range from 1 to 12.4 GHz helped to define the main sources of errors and to improve accuracy of measurements.