DIPAC2011 - List of Keywords (controls)

Paper	Title	Other Keywords	Page
MOOC03	The Fermi@Elettra Cavity BPM System: Description and Commissioning Results	cavity, pick-up, FEL, undulator	26
	M. Ferianis, A.O. Borga, P. Craievich, R. De Monte, G. Gaio, M. Predonzani ELETTRA, Basovizza, Italy M. Dal Forno DIEIT, Trieste, Italy
	The Fermi@elettra cavity BPM (C-BPM) system is based on an original implementation of the C-BPM scheme as the pick-up, operating at 6.5GHz, is coupled to a dedicated, self-calibrating electronics based on a novel concept. The system has been developed in-house; both the E-M and the mechanical design of the pick-up have been carried out, including an original frequency tuning scheme. The detector electronics directly obtains the envelope of the sum and difference signals by means of an RF 180° hybrid; no mixer for the RF signal down conversion is used. The detector is based on 3 blocks: an RF front-end, a baseband analogue transmission module and a digital back-end unit, based on a micro-TCA platform. The digital back-end is equipped with a powerful Virtex 5 FPGA and several real-time tasks have been implemented on it, including intra-pulse calibration. Ten C-BPM stations have been installed so far, fully integrated in the FERMI control System, enabling a real-time control of this key FEL diagnostics. Results on performances with beam are also presented; the scale factor of C-BPMs is obtained with beam, as two-axis micrometer translation stages have been installed.
	Slides MOOC03 [2.733 MB]

MOPD01	Beam Diagnostics for the NSLS-II Booster	pick-up, booster, betatron, vacuum	29
	V.V. Smaluk BINP, Novosibirsk, Russia E.A. Bekhtenev, V.P. Cherepanov, G.V. Karpov, V. Kuzminykh, O.I. Meshkov BINP SB RAS, Novosibirsk, Russia I. Pinayev, O. Singh, K. Vetter BNL, Upton, Long Island, New York, USA
	For successful commissioning and effective operation of the projected NSLS-II Booster, a set of beam diagnostic instruments has been designed. Fluorescent screens are used for the Booster commissioning and troubleshooting. Closed orbit is measured using electrostatic BPMs with turn-by-turn capability. The circulating current and beam lifetime are measured using a DC current transformer. The fill pattern is monitored by a fast current transformer. Visible synchrotron radiation is registered for observation of the beam image. Betatron tunes are measured using two pairs of striplines, the first pair is for beam excitation and the second one – for beam response measurement. Design and performance of the Booster beam instrumentation are described.

MOPD02	The CNAO Qualification Monitor	extraction, synchrotron, power-supply, proton	32
	C. Viviani, G. Balbinot, J. Bosser, M. Caldara, H. Caracciolo, M.A. Garella, V. Lante, A. Parravicini, M. Pullia CNAO Foundation, Milan, Italy
	The CNAO (Centro Nazionale di Adroterapia Oncologica) Foundation is the first Italian center for deep hadrontherapy. It will treat patients using Protons and Carbon ions in the next coming months. Patient safety is the first priority and many diagnostics devices have been developed to guarantee it. This work presents the so-called Qualification Monitor (QM). It is mounted in the common part of the four extraction lines, in front of the Chopper Dump, and it aims to qualify the extracted beam profile and intensity, before sending it to the treatment rooms. It is made of two different detectors: the first one, called Qualification Profile Monitor (QPM), is made by two dimensional harp of scintillating fibers to measure horizontal and vertical profiles. The second one, named Qualification Intensity Monitor (QIM) is a scintillating plate for intensity measurement. At the beginning of each extracted spill the beam is dumped on the Chopper Dump and it hit the QM. Only a positive result from beam qualification allows to switch on Chopper magnets and to send the beam to the patient. The QM is working with beam from some months, first results and future upgrades are presented.

MOPD10	A Calibration Method for the RF Front-end Asymmetry of the DBPM Processor	target, pick-up, instrumentation, factory	56
	X. Yi, L.W. Lai, Y.B. Leng, Y.B. Yan, N. Zhang SSRF, Shanghai, People's Republic of China Z.C. Chen SINAP, Shanghai, People's Republic of China
	Digital Beam Position Monitor (DBPM) processor, designed to measure the beam positions in the LINAC, booster and the storage ring of a particle accelerator, has been used in many synchrotron radiation facilities. Channels asymmetry, which deteriorates the performance of the DBPM, is inevitable since the RF front-end needs four exactly same blocks. Recently, an RF front-end board for DBPM has been made with calibration circuit which clears the switching noise. The calibration method will be described in detail, including an overview of the RF board. The beam current dependence, which is sensitive to channels asymmetry, decreases from 160μm to 25μm after the calibration in the lab test.
	Poster MOPD10 [1.682 MB]

MOPD11	High Resolution BPM Upgrade for the ATF Damping Ring at KEK	damping, closed-orbit, injection, diagnostics	59
	N. Eddy, C.I. Briegel, B.J. Fellenz, E. Gianfelice-Wendt, P.S. Prieto, R. Rechenmacher, A. Semenov, D.C. Voy, M. Wendt, D.H. Zhang Fermilab, Batavia, USA N. Terunuma, J. Urakawa KEK, Ibaraki, Japan
	Funding: Work is supported by the joint high energy physics research program of Japan-USA, and by FNAL, operated by Fermi Research Alliance LLC under contract #DE-AC02-07CH11359 with the US Dept. of Energy. A beam position monitor (BPM) upgrade at the KEK Accelerator Test Facility (ATF) damping ring has been accomplished, carried out by a KEK/FNAL/SLAC collaboration under the umbrella of the global ILC R&D effort. The upgrade consists of a high resolution, high reproducibility read-out system, based on analog and digital down-conversion techniques, digital signal processing, and also implements a new automatic gain error correction schema. The technical concept and realization as well as results of beam studies are presented.

MOPD20	Applicability of the AM-PM Conversion Method to Beam Position Monitoring of Electron Beams accelerated in S-Band Frequency Range	electron, pick-up, insertion, monitoring	86
	M. Ruf, P. Quednau, L. Schmidt U. Erlangen-Nurnberg LHFT, Erlangen, Germany S. Setzer Siemens Med, Erlangen, Germany
	Funding: Work supported by Bayerische Forschungsstiftung in the project "MEDieMAS - Effiziente Bestrahlungsgeräte für Krebstherapie (Efficient radiation systems for cancer therapy)", file number AZ-735-07 In this paper, the applicability of the amplitude-to-phase-conversion (AM-PM) method to beam position monitoring (BPM) purposes in S-Band frequency range is investigated. The proof-of-principle experiment is done by AM-PM-processing of capacitive pickup signals generated by a 6 MeV S-Band electron beam. It is demonstrated that the AM-PM-output pulsed DC signal is proportional to transverse beam offsets. Furthermore, design considerations and selection criteria of appropriate RF devices are described. Additionally, results of cold measurements of a planar 2-channel AM-PM-receiver module are presented indicating that the applicability will also be given for even higher frequency ranges.

MOPD21	Overview of the BPM System of the ESS-Bilbao	EPICS, linac, LLRF, impedance	89
	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 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
	The BPM system from ESS-Bilbao is presented, including test bench, electronics and test results. Our test bench implements 4 capacitive buttons welded to the beam pipe. The position of the internal tube simulating the beam can be changed with respect to the outer tube within a range of 20 mm, with a resolution less than 10 μm. It is connected to an Analog Front-End (AFE) where signals are conditioned and converted to baseband and a Digital Unit (DU) to sample them and calculate the position and phase. The AFE is based on logarithmic amplifiers and IQ demodulators. Signals are converted from differential to single-ended and conditioned to meet the DU requirements (FPGA and ADC). DU includes offset compensation, gain adjustment, CORDIC, delta over σ algorithm and linearization blocks. To manage the FPGA a Java interface has been developed including also the EPICS integration by means of JavaIOC and a MySQL interface. The resolution and accuracy results are promising (less than 10 μm and 1° for the position and phase) provided that the effect of several errors such as temperature variations and nonlinearities are minimized through temperature regulation and system calibration.
	Poster MOPD21 [1.476 MB]

MOPD23	Photon BPM Electronics Development at Taiwan Light Source	photon, injection, feedback, diagnostics	95
	P.C. Chiu, J. Chen, Y.K. Chen, K.T. Hsu, K.H. Hu, C.H. Kuo NSRRC, Hsinchu, Taiwan
	Photon BPMs are very useful for photon beam position and stability observation. There are several kinds of photon BPMs and electronics with different design installed at beamline front-ends at the Taiwan Light Source. To provide a better integration and efficient usage of the photon BPM, a commercial BPM electronics - Libera Photon was chosen for an integral solution and has showed at least one micron performance for several months of testing. In this report, the installation process and testing results of the photon BPM will be presented.
	Poster MOPD23 [0.595 MB]

MOPD26	Testing of New Hadron Beam Phase and Position Monitor at CIEMAT Laboratory	instrumentation, pick-up, monitoring, feedback	104
	M. Znidarcic, B.B. Baricevic, R. Hrovatin I-Tech, Solkan, Slovenia J.M. Carmona, A. Ibarra, I. Podadera CIEMAT, Madrid, Spain
	The Libera Single Pass H is the new instrumentation intended for phase, position and charge monitoring in hadron and heavy ion LINACs and transfer lines. Initial measurements and verification of the instrumentation performance were conducted in the laboratory at Instrumentation Technologies. Characterization measurements of the same electronics were later carried out at CIEMAT laboratory. The measurements were performed on a CIEMAT wire test bench with the 175 MHz pulsed signal connected to the wire. Different measurements were performed on the test bench; First, by moving the wire over larger displacements and checking the position and, later, by changing the signal phase and performing the phase shift measurement. This article discusses the new Libera Single Pass H electronics, the tests carried out in the test bench and the performance obtained.

MOPD31	Future Timing and Synchronization Scheme at ELBE	laser, electron, radiation, gun	116
	M. Kuntzsch, A. Büchner, T. Kirschke, U. Lehnert, F. Röser HZDR, Dresden, Germany
	The Radiation Source ELBE at Helmholtz-Zentrum Dresden-Rossendorf is currently extended to offer capacity for new experiments. The reconstruction includes the setup of a THz-beamline with a dedicated user laboratory and a beamline for electron-beam - high-power laser experiments. The current synchronization scheme offers stability to the picoseconds level. The new experiments require a femtosecond synchronization in order to get field-strength resolved THz-probes and to have a stable overlap between the electron-bunches with the laser pulses. In the future there will be a MIT/DESY-like system [1] with a pulsed fiber laser as an optical reference oscillator. The laser pulses will be distributed over stabilized fiber links to the remote stations. Later on it is planned to install EOM-based beam arrival time monitors (BAMs) in order to monitor the bunch jitter and to establish a feedback system to reduce the jitter. Besides that, the timing system has to be revised to trigger experiments with low repetition rate, two guns (thermionic DC, superconducting RF) and lasers. The Poster will show the Layout of the possible future Timing and Synchronization System at ELBE. [1] J. Kim, J.A. Cox, J.J. Chen, F.X. Kärtner, "Drift-free femtosecond timing synchronization of remote optical and microwave sources", Nature Photonics, Vol. 2, pp. 733-736 (2008).

MOPD40	Beam Measurements with Visible Synchrotron Light at VEPP-2000 Collider	collider, diagnostics, electron, positron	140
	Yu. A. Rogovsky, D.E. Berkaev, I. Koop, A.N. Kyrpotin, I. Nesterenko, A.L. Romanov, Y.M. Shatunov, D.B. Shwartz BINP SB RAS, Novosibirsk, Russia
	This paper describes beam diagnostics at VEPP-2000 collider, based on visible synchrotron light analysis. These beam instruments include: SR beamline and optics; acquisition tools and high resolution CCD cameras distributed around the storage ring to measure the transverse beam profile and its position in vacuum chamber; photomultiplier tubes (PMT) which enables beam current measurements. Some applications of these measurement systems and their measurement results are presented.
	Poster MOPD40 [0.599 MB]

MOPD41	A Fast CVD Diamond Beam Loss Monitor for LHC	radiation, collimation, beam-losses, instrumentation	143
	E. Griesmayer, B. Dehning, D. Dobos, E. Effinger, H. Pernegger CERN, Geneva, Switzerland
	Chemical Vapour Deposition (CVD) diamond detectors were installed in the collimation area of the CERN LHC to study their feasibility as Fast Beam Loss Monitors in a high-radiation environment. The detectors were configured with a fast, radiation-hard pre-amplifier with a bandwidth of 2 GHz. The readout was via an oscilloscope with a bandwidth of 1 GHz and a sampling rate of 5 GSPS. Despite the 250 m cable run from the detectors to the oscilloscope, single MIPs were resolved with a 2 ns rise time, a pulse width of 10 ns and a time resolution of less than 1 ns. Two modes of operation were applied. For the analysis of unexpected beam aborts, the loss profile was recorded in a 1 ms buffer and, for nominal operation, the histogram of the time structure of the losses was recorded in synchronism with the LHC period of 89.2 μs. Measurements during the LHC start-up (February to December 2010) are presented. The Diamond Monitors gave an unprecedented insight into the time structure of the beam losses resolving the 400 MHz RF frequency as well as the nominal bunch separation of 25 ns. In future, these detectors will be used to study ghost bunches and particles in the 3 μs abort gap.

MOPD55	SEM-GRID Prototype Electronics using Charge-Frequency-Converters	diagnostics, ion, radiation, monitoring	176
	M. Witthaus, J. Adamczewski-Musch, H. Flemming, J. Frühauf, S. Löchner, H. Reeg, P. Skott GSI, Darmstadt, Germany
	A prototype system using an ASIC equipped with 8 Charge-to-Frequency Converters (CFC) was developed in collaboration between the Beam Diagnostics and Experiment Electronics Department at GSI. The maximum sensitivity is 250 fC per output pulse. It will serve as an economic alternative for the readout electronics of Secondary Electron Monitor (SEM)profile grids or comparable beam diagnostic devices like Multi-Wire Proportional Chambers (MWPC). The goal of this contribution is to report on a detailed performance test under real beam conditions at GSI beam lines. A 32-channel electronics is connected to different beam profile SEM-grids at a LINAC beam line and tested with various beam conditions. Transversal beam profiles with a time resolution down to the microsecond range have been recorded successfully. Beam profiles recorded with the new CFC-board and the old standard trans-impedance amplifiers agreed well. Further measurements were done with Multi-Wire Proportional Chamber. Therefore the prototype was extended to 64-input channels recently.
	Poster MOPD55 [1.344 MB]

MOPD60	Beam Induced Fluorescence (BIF) Monitors as a Standard Operating Tool	ion, photon, diagnostics, heavy-ion	185
	C.A. Andre, F. Becker, H. Bräuning, P. Forck, R. Haseitl, R. Lonsing, B. Walasek-Höhne GSI, Darmstadt, Germany
	For high current operation at the GSI Heavy Ion UNILAC non intercepting methods for transverse beam profile determination are required. The Beam Induced Fluorescence (BIF) Monitor, an optical measurement device based on the observation of fluorescent light emitted by excited gas molecules was brought to routine operation. Detailed investigations were conducted for various beam parameters to improve the electronics and the optical setup. Up to now, four BIF monitor stations (for detection of both, horizontal and vertical beam profiles) were installed at UNILAC and two additional setups are planned. This contribution reports on first upgrades of the BIF monitors with a Siemens PLC for FESA-based slow controls and hardware protection procedures. The versatile control and display software ProfileView is presented as an easy-to-use and stable beam diagnostic tool for the GSI operating team.
	Poster MOPD60 [3.060 MB]

MOPD64	High Quality Measurements of Beam Lifetime, Instant-Partial-Beam Losses and Charge-Accumulation with the New ESRF BPM System	injection, cavity, beam-losses, storage-ring	194
	K.B. Scheidt, F. Ewald, B. Joly ESRF, Grenoble, France
	The BPM system of the ESRF Storage Ring, that was entirely replaced by 224 units of the Libera-Brilliance system in 2009, is now also being used for precise and fast measurements of the Beam Lifetime and so-called Instant-Partial-BeamLosses. This is possible by the use of the Sum signal of the four BPM buttons on each of the 224 BPM stations in the Ring. This paper will describe the strong advantages in terms of response time, but also the precautions and the limitations of this particular use. Results will show the ultimate attainable performances and a detailed comparison with that of three independent DC current transformers also installed in the Ring. The same Sum signal is also usable for precise measurement of Accumulated Charge during the injection process and results of this will also be presented.

MOPD68	Pickup Beam Measurement System at the VEPP-2000 Collider	collider, betatron, injection, positron	203
	Yu. A. Rogovsky, E.A. Bekhtenev BINP SB RAS, Novosibirsk, Russia
	This paper reviews the present state of electromagnetic beam position monitors (pickups) at VEPP-2000 collider. It includes descriptions of position monitors, typical interfaces for these monitors and their system characteristics (resolution, stability, bandwidth and problems or limitations) are discussed. The paper also reviews several types of diagnostic measurements using beam position monitors which are useful in improving accelerator operations.
	Poster MOPD68 [0.398 MB]

MOPD71	Using the Transverse Digital Damper as a Real-time Tune Monitor for the Booster Synchrotron at Fermilab	booster, damping, kicker, synchrotron	209
	N. Eddy, O. Lysenko Fermilab, Batavia, USA
	The Fermilab Booster is a fast ramping (15Hz) synchrotron which accelerates protons from 400MeV to 8GeV. During commissioning of a transverse digital damper system, it was shown that the damper could provide a measurement of the the machine tune throughout the cycle by exciting just 1 of the 84 bunches with minimal impact on the machine operation. The algorithms used to make the measurement have been incorporated into the damper FPGA firmware allowing for real-time tune monitoring of all Booster cycles. Operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy.

MOPD75	Compact Reconfigurable FPGA Based Beam Current Safety System for UCN	target, monitoring, kicker, EPICS	218
	P.-A. Duperrex PSI, Villigen, Switzerland
	At PSI, a new and very intensive Ultra-Cold Neutron (UCN) source based on the spallation principle was commissioned in December 2010 and will start production in 2011. The 590 MeV, 1.3 MW proton beam will be switched towards the new spallation target for about 8 s every 800 s. A beam current monitoring system has been developed as part of a safety system for the UCN source operation. This monitoring system is based on a reconfigurable FPGA system from National Instrument. This paper will present the advantages of such a system compared to analog electronics, its flexibility to future new performance requests and the integration details in the safety control system.

MOPD76	The Petra III Fast Orbit Feedback System	feedback, instrumentation, injection, brilliance	221
	J. Klute, K. Balewski, H.T. Duhme, H. Tiessen, F. Wierzcholek DESY, Hamburg, Germany
	Orbit stability is a crucial and import issue of 3rd generation light sources. Ambient mechanical and electrical noise cause rather large orbit distortions which have to be counteracted by an orbit feedback. Extensive studies of the orbit distortions in PETRA III have shown that the frequencies of the ambient noise lie within a frequency range from about 0.01Hz to 100Hz. In this paper we describe the main components, their properties and the layout of PETRA III’s orbit feedback. Furthermore experimental results on short and long term stability will be presented. It will be shown that the required orbit stability of ±0.5 μm in the vertical plane can be maintained over 50 h.

MOPD78	Synchronous Measurement of Stability of Electron Beam, X-ray Beam, Ground and Cavity Voltage	cavity, electron, feedback, photon	227
	G. Rehm, M.G. Abbott, C. Bloomer, I. Uzun Diamond, Oxfordshire, United Kingdom
	We have developed hardware and software that allows continuous and synchronous recording of electron and X-Ray beam position as well as cavity voltage and ground vibrations at a rate of about 10kS/s for periods of many days. To this end, additional nodes have been added to our existing fast network that feeds the Fast Orbit Feedback System, namely tungsten vane type front end XBPMs, RF cavity pickups and accelerometers. The synchronous nature of these measurements shows the correlation between electron beam motion through an insertion device and observed X-ray beam motion in the frontend or orbit distortions caused by fluctuations of the RF cavity voltage. While the additional channels currently are only observed, the potential of including these in the fast orbit feedback will be discussed.

MOPD86	Development of FESA-based Data Acquisition and Control for FAIR	diagnostics, synchrotron, high-voltage, power-supply	248
	R. Haseitl, H. Bräuning, T. Hoffmann, K. Lang, R. Singh GSI, Darmstadt, Germany
	GSI has selected the CERN Front End Software Architecture (FESA) to operate future beam diagnostic devices for the upcoming FAIR facility. The FESA framework is installed and operational at the GSI site, giving equipment specialists the possibility to develop FESA classes for device control and data acquisition. This contribution outlines first developments of FESA-based systems for various applications. Prototype DAQ systems based on FESA are the BPM system of the synchrotron SIS18 with data rates up to 7 GBit/s and a large scaler setup for particle counters called LASSIE. FESA classes that address gigabit Ethernet cameras are used for video imaging tasks like scintillator screen observation. Control oriented FESA classes access industrial Programmable Logic Controllers (PLCs) for the slow control of beam diagnostic devices. To monitor temperatures and set fan speeds of VME crates, a class communicating over the CAN bus has been developed.
	Poster MOPD86 [3.137 MB]

MOPD87	The LHC Beam Presence Flag System	injection, impedance, monitoring, feedback	251
	M. Gasior, T.B. Bogey CERN, Geneva, Switzerland
	Before injecting any high intensity bunches into the LHC a circulating low intensity pilot bunch must be present to confirm the correct settings of the main machine parameters. For the 2010 LHC run the detection of this pilot beam was done with the beam current transformer system. To increase redundancy of this important safety function a dedicated beam presence flag system was designed, built and tested with beam to be used operationally in the 2011 run. In this system signals from four electrodes of a beam position monitor (BPM) are processed with separate channels, resulting in a quadruple system redundancy for either beam. Each system channel consists of an analogue front-end converting the BPM signals into two logic states, which are then transmitted optically to the machine protection and interlock systems. For safety reasons the system does not have any remote control or adjustable elements and its only inputs are the beam signals. This paper describes the new LHC beam presence flag system, in particular the analogue front-end based on diode peak detectors.
	Poster MOPD87 [8.200 MB]

MOPD92	Review of Recent Upgrades & Modernizations on Diagnostics in the ESRF Storage Ring and Injector	booster, storage-ring, diagnostics, vacuum	263
	B. Joly, P. Arnoux, D. Robinson, K.B. Scheidt ESRF, Grenoble, France
	Over the last two years a number of upgrades and modernizations have been implemented on diagnostic tools in both the Injector system and the Storage Ring. Brand new diagnostic tools have also been added. In the Injector, a new Transfer Line current monitor has been installed, as well as four new ¼ λ Striplines equipped with Single-Pass Libera electronics. In the Storage Ring, a new Visible Light Mirror (VLM) system has replaced the original system that had been in place for more than 15 years. Also, the acquisition system for the DC Current Transformers has been upgraded with new hardware. Descriptions and results are presented on the improved reliability, sensitivity and resolution of these systems.

TUOB01	Options for Next Generation Digital Acquisition Systems	instrumentation, factory, target, insertion	289
	A. Boccardi CERN, Geneva, Switzerland
	Digital acquisition system designers have an always increasing number of options in terms of bus standards and digital signal processing hardware among which to choose. This allows for a high flexibility but also open the door to a proliferation of different architectures, potentially limiting the reusability and the design synergies among the various instrumentation groups. This contribution illustrates the design trends in some of the major institutes around the world with design examples including VME, PCI and μTCA based modular systems using AMC and/or FMC mezzanines. Some examples of FPGA design practices aimed to increase reusability of code will be mentioned together with some of the tools already available to designers to improve the information exchange and the collaboration, like the Open Hardware Repository project.
	Slides TUOB01 [3.543 MB]

TUOB03	Next Generation Electronics based on μTCA for Beam-Diagnostics at FLASH and XFEL	diagnostics, feedback, laser, low-level-rf	294
	P. Gessler, M.K. Bock, M. Bousonville, M. Felber, M. Hoffmann, T. Jezynski, T. Lamb, F. Ludwig, G. Petrosyan, L.M. Petrosyan, K. Rehlich, S. Schulz, P. Vetrov, M. Zimmer DESY, Hamburg, Germany C. Bohm, A. Hidvégi Stockholm University, Stockholm, Sweden K. Czuba Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland D.R. Makowski TUL-DMCS, Łódź, Poland
	Funding: This work is partly supported by IRUVX-PP an EU co-funded project under FP7 (Grant Agreement 211285). Almost all accelerator-related diagnostic and steering systems require front-end electronic hardware and software for digitizing, synchronization, processing, controlling, and providing access to the control system. Increasingly high demands on resolution, bandwidth, stability, redundancy, low latency, real-time processing and distribution create the need for new technologies in order to fulfill those demands. For this reason, at the European XFEL and FLASH, the new, μTCA industry standard will be deployed. Over the last few years, significant achievements have been made in μTCA developments in collaboration with other research institutes and industry. In this paper, we give an overview of the required components of a typical μTCA system for diagnostics applications. The FLASH bunch arrival-time monitor will be used as an example.
	Slides TUOB03 [9.075 MB]

TUPD06	Beam Diagnostic Overview of the SPIRAL2 RNB Section	ion, electron, target, ion-source	314
	C. Jamet, T.A. André, E. Guéroult, B. Jacquot, N. Renoux, A. Savalle, T. Signoret, F. Varenne, J.L. Vignet GANIL, Caen, France J.-M. Fontbonne LPC, Caen, France
	An extension to the existing GANIL facility in Caen, France is under construction. The new SPIRAL 2 construction will be realized in two phases, for the first phase the construction started in January 2011 and will consists of the accelerator buildings with two experimental facilities S3 and Neutrons for science (NFS). The second phase is the so called production building where radioactive ions are produced through the ISOL (Isotope Separation On Line) method. The produced radioactive ion beams (RIBs) will be extracted and accelerated up to 60keV from the ion sources, after beam purification the beam will be driven in the secondary beam lines either to a new experimental facility DESIR (Decay, excitation and storage of radioactive ions) constructed during the second phase of the new installation or the RIBs will be charge breed to form multi-charged ions that will be driven to the existing GANIL facility and post accelerated in the CIME cyclotron. This overview article gives a description of the secondary beam lines, the foreseen beam diagnostics which will allow tuning and controlling the radioactive ion beams in the secondary beam lines constructed in the SPIRAL2 Phase 2.

TUPD11	Developments for IFMIF/EVEDA LIPAc Beam Position Monitors: The Sensors at the MEBT and the Wire Test Bench	pick-up, linac, quadrupole, simulation	320
	I. Podadera, J.M. Carmona, A. Guirao, A. Ibarra, L.M. Martinez Fresno, E. Mirones, R. Unamuno, J.G.S. de la Gama CIEMAT, Madrid, Spain
	Funding: This work has been partially supported by the Spanish Ministry of Science and Innovation under Project ENE2009-11230 The IFMIF-EVEDA accelerator will be a 9 MeV, 125 mA CW deuteron accelerator which aims to validate the technology that will be used in the future IFMIF accelerator. In the Medium Energy Beam Transport line (MEBT) connecting the RFQ and the MEBT, non-interceptive Beam Position Monitors pickups (MBPMs) will measure the transverse position and phase in order to maximize the transport efficiency of the beamline. The response of the MBPMs must be optimized for a beam current for 5 MeV, and a peak beam current of 125 mA. Due to the lack of space in the MEBT, the MBPMs will be located inside the magnets. The MBPMs will have to fit inside the magnets without perturbing the magnetic field. In this contribution, the electromagnetic and mechanical design of the MBPM will be presented. In addition, in order to validate and characterize all the BPMs type of IFMIF/EVEDA once they are manufactured, a wire test bench has been constructed and verified at CIEMAT. The design and validation results of the test bench will be discussed.

TUPD15	Technology Selection for the Beam Position Tuning System in Hadrontherapy Facilities	electron, photon, high-voltage, proton	332
	C. Belver-Aguilar, C. Blanch Gutierrez, A. Faus-Golfe, J.J. García-Garrigós IFIC, Valencia, Spain E. Benveniste, M. Haguenauer, P. Poilleux LLR, Palaiseau, France
	Funding: CYCIT – IN2P3: AIC10-D-000518 The Beam Delivery System of some hadrontherapy facilities is characterized by having scanning magnets, which move the beam in order to irradiate all the tumor volume. To control the beam position, a Beam Position Monitor (BPM) is needed. 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 possible photodiodes able to read the light emitted by the scintillating fiber, and the tests performed in order to find the most suitable photodiode to measure the beam position from the variations in the beam current. The setup used for the tests comprises a Sr-90 source, which emits electrons, a scintillating fiber, converting these electrons into photons, and a photodiode, which detects the photons leaving the fiber. The photodiodes studied have been of two types: Avalanche Photodiode (APD) and Multi Pixel Photon Counter (MPPC). In this paper both photodiodes are compared and the results are presented.

TUPD19	Initial Tests of New Electron and Photon Beam Position Monitor Electronics at the Advanced Photon Source	photon, brilliance, injection, electron	344
	P. Leban I-Tech, Solkan, Slovenia G. Decker ANL, Argonne, USA
	Funding: Use of the APS, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science by ANL, was supported by the U.S. DOE under Contract No. DE-AC02-06CH11357 Measurements were done at the Advanced Photon Source (APS) with Libera Brilliance+, connected to the small-aperture insertion device vacuum chamber pickup electrodes near the beamline 35-ID source point. A photoemission-based photon beam position monitor located 16.35 meters downstream of the center of the ID straight section was also monitored using Libera Photon electronics in horizontal/vertical configuration. Top-up injection transients were recorded simultaneously on both units, providing details about the electron and photon beam motions before, during, and after injection in the storage ring and beamline front end. FFT spectra from the APS-developed BSP-100 broadband BPM data acquisition electronics were compared with the Libera instruments. This article discusses the calibration procedure for electron and photon beam position monitors along with results of these measurements.

TUPD21	Frontend Measurements and Optimizations at Libera Brilliance BPM Electronics during Commissioning of the Petra III Synchrotron Light Source	brilliance, instrumentation, feedback, synchrotron	350
	F. Schmidt-Föhre, G. Kube, J.M. Maass, K. Wittenburg DESY, Hamburg, Germany
	New 3rd generation synchrotron light sources like Petra III utilize high-accuracy beam position measurement (BPM) systems to achieve the desired precision for beam position measurement and control, as needed for electron/positron beam stability and brilliance of the delivered photon beam. To reach the design goals, specifically adapted and parameterized commercial-of-the-shelf (COTS) Libera Brilliance BPM processor electronics are used within the Petra III BPM system. Quality of the acquired position measurement and orbit control data is highly dependent on the properties and setup of the analog and digital frontend of such BPM electronics. This paper shows influences and optimizations at the BPM system frontend of the Petra III light-source in reference to corresponding measurements done during the accelerator commissioning phase.

TUPD23	New Bunch-by-Bunch Feedback System for the TLS	feedback, diagnostics, EPICS, kicker	353
	C.H. Kuo, Y.K. Chen, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, K.H. Hu NSRRC, Hsinchu, Taiwan
	FPGA based bunch-by-bunch feedback systems were deployed in 2005-2006 by using SPring-8 designed feedback processors for the Taiwan Light Source. To provide spare units and explore integrate with the control system in the EPICS toolkit environment, feedback processors from the Dimtel were setup. The new system can be swap with the existed system by simple cable re-connection and integrated with the EPICS system in seamless way. Rich functionality except the basic feedback function includes excitation of individual bunch or specifies bunches, averaged spectrum, tune measurement by the feedback dip in the averaged spectrum, fill pattern measurement, etc. are explorer. Current stage implementation and features of the system will summary in this report.

TUPD35	Development of an Alternative, Photodiode-Based, Femtosecond Stable Detection Principle for the Link Stabilization in the Optical Synchronization Systems at FLASH and XFEL	laser, FEL, feedback, status	380
	T. Lamb, M.K. Bock, M. Bousonville, M. Felber, P. Gessler, F. Ludwig, S. Ruzin, H. Schlarb, B. Schmidt, S. Schulz DESY, Hamburg, Germany
	Funding: This work is partly supported by IRUVX-PP an EU co-funded project under FP7 (Grant Agreement 211285). The fs-stable timing information in the optical synchronization system at FLASH and the upcoming European XFEL is based on the distribution of laser pulses in optical fibers. The optical length of the fibers is continuously monitored and drifts in signal propagation time are actively compensated in order to provide a phase stable pulse train at the end of the fiber link. At present, optical cross-correlation is used to measure the optical length changes. To overcome some of the disadvantages of the current scheme, a different approach for the detection of the optical fiber link length variation was developed. This new scheme uses 10GHz photodiodes to measure the amplitude modulation of harmonics created by overlapping two pulse trains. The long-term stability of the prototype of this detector over 33h was demonstrated to be below 5fs (peak-to-peak) with a rms jitter of about 0.86fs. The detection principle itself is practically insensitive to environmental influences and needs only about 10% of the optical power, compared to the optical cross-correlator.

TUPD43	XFEL Beam Loss Monitor System	electron, beam-losses, undulator, high-voltage	401
	A. Kaukher, I. Krouptchenkov, B. Michalek, D. Nölle, H. Tiessen DESY, Hamburg, Germany
	European XFEL will have a sophisticated Machine Protection System, part of which - Beam Loss Monitors(BLM). The monitors will detect losses of electron beam, in order to protect the components of the XFEL from damage and excessive activation. For protection of undulators, BLMs with a scintillator bar will be used. BLMs at places with high radiation load will be equipped with fused silica rods. Beam dumps of the XFEL will be instrumented with glass-fiber BLMs. The BLMs were tested with an electron test-beam at DESY, as well as at FLASH. Due to large amount of light produced by scintillator and high gain of the used photomultiplier, no optical grease is needed in front of the photomultiplier' window, while typical cathode voltage is only 500-600 volt. The prototype with quartz glass was typically operated at higher cathode voltage. Good operation of all three types of BLMs prototypes was obtained. It is planned to use same monitors also for the FLASH2 project. Current status of the XFEL BLM system development will be presented.

TUPD44	LHC Beam Loss Monitoring System Verification Applications	monitoring, collider, feedback, survey	404
	E. Fadakis, B. Dehning, S. Jackson, C. Zamantzas CERN, Geneva, Switzerland
	The LHC Beam Loss Monitoring (BLM) system is one of the most complex instrumentation systems deployed in the LHC. In addition to protecting the collider, the system also needs to provide a means of diagnosing machine faults and deliver a feedback of losses to the control room as well as to several systems for their setup and analysis. It has to transmit and process signals from almost 4’000 monitors, and has nearly 3 million configurable parameters. The system was designed with reliability and availability in mind. The specified operation and the fail-safety standards must be guaranteed for the system to perform its function in preventing superconductive magnet destruction caused by particle flux. Maintaining the expected reliability requires extensive testing and verification. In this paper we report our most recent additions to the numerous verification applications. The developments have been made using LabVIEW and CERN custom made libraries and allow the user to connect either directly to the front end computer (FEC) or through a dedicated server.

TUPD56	High Resolution SR Profile Monitor at ATF2 Extraction Line	extraction, emittance, background, damping	434
	T. Naito, T.M. Mitsuhashi KEK, Ibaraki, Japan
	The profile monitor using visible light of the SR at ATF2 extraction line has been developed. KEK-ATF is a facility to produce extremely low emittance beam for the linear collider. The emittance in the damping ring is ex=1x10^-9 m and ey=1x10{-11} m, respectively. The ATF2 extraction line is a transport line to study the Final focus system for the linear collider. The designed beam size at the profile monitor is 230 μm in horizontal and 13 μm in vertical. We used a wide aperture optical system to reduce the Rayleigh limit of the optical system. The performance of the monitor is reported.

TUPD61	Multi Optical Transition Radiation System for ATF2	emittance, target, coupling, extraction	446
	C. Blanch Gutierrez, J. Alabau-Gonzalvo, A. Faus-Golfe, J.J. García-Garrigós IFIC, Valencia, Spain J. Cruz, D.J. McCormick, G.R. White, M. Woodley SLAC, Menlo Park, California, USA
	Funding: FPA2010-21456-C02-00 In this paper we describe the calibration tests, software development and first measurements of a Multi Optical Transition Radiation System in the beam diagnostic section of the Extraction (EXT) line of ATF2, close to the multi wire scanner system. First 2D emittance measurements have been made with success and the system is being used normally for coupling correction. 4D emittance reconstruction algorithm is under improvement and implementation before a systematic measurement campaign and comparison with wire scanners is done. This will be a definitive test of the OTR as a beam emittance diagnostic device, which will give the ability to measure the beam emittance with high statistics, giving a low error and a good understanding of emittance jitter.

TUPD64	Test Measurements of a 20 m/s Carbon Wire Beam Scanner	vacuum, simulation, feedback, acceleration	452
	M. Koujili, J. De Freitas, B. Dehning, J. Emery, J.F. Herranz Alvarez, D. Ramos, M. Sapinski CERN, Geneva, Switzerland Y. Ait Amira UFC, Besançon, France A. Djerdir UTBM, Belfort, France
	This paper presents the design of the actuator for the fast and high accuracy Wire Scanner system. The actuator consists of a rotary brush-less synchronous motor with the permanent magnet rotor installed inside the vacuum chamber and the stator installed outside. The fork, permanent magnet rotor and two angular position sensors are mounted on the same axis and located inside the beam vacuum chamber. The system has to resist a bake-out temperature of 200°C and ionizing radiation up to tenths of kGy/year. Maximum wire travelling speed of 20 m/s and a position measurement accuracy of 4 μm is required. Therefore, the system must avoid generating vibration and electromagnetic interference. A digital feedback controller will allow maximum flexibility for the loop parameters and feeds the 3-phase linear power driver. The performance of the presented design is investigated through simulations and experimental tests.

TUPD73	Fast Orbit Stabilization System for Tandem APPLE-II Undulators at the KEK-PF	kicker, undulator, power-supply, polarization	479
	T. Obina, K. Harada, R. Takai KEK, Ibaraki, Japan
	A rapid-polarization switching source has been developed in the KEK-PF 2.5-GeV electron storage ring. The source consists of two tandem APPLE-II type elliptically polarizing undulators (EPU) and five fast kicker magnets. The kicker magnets produce a local bump orbit at the frequency up to 100 Hz. Amplitude and phase of these magnets must be tuned precisely in order to minimize the leakage of residual orbit outside of the kicker bump. A fast orbit stabilization system which consists of ADC/FPGA/DAC are also developed to reduce the remaining orbit fluctuations in vertical and horizontal planes. In this paper, design and the preliminary result of the fast orbit compensation system is presented.

TUPD79	Preliminary Tune Feedback Study in the Taiwan Light Source	feedback, insertion, insertion-device, undulator	491
	C.H. Kuo, J. Chen, P.C. Chiu, K.T. Hsu, K.H. Hu NSRRC, Hsinchu, Taiwan
	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. There is global orbit feedback to solve global orbit problem. In the tune shift, the tune feedback will be proposed to make up it for various insertion devices operation. The stable tune measurement and compensation will be discussed in this report.

TUPD86	RF Reference Distribution and Timing System for the Taiwan Photon Source	gun, linac, synchrotron, booster	506
	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
	Taiwan Photon Source (TPS) is a low-emittance 3-GeV synchrotron light source with circumference of 518.4 m (24 straight sections for installation of insertion devices), radio-frequency cavities and electron beam from the 150 MeV linac system which being in construction at National Synchrotron Radiation Research Center (NSRRC) campus. A high stability of the novel fiber based 500 MHz RF reference distribution is required and planned to use. Timing system for the TPS will be an event based system. It is based on 6U CompactPCI form factor from Micro-Research Finland Oy. Prototyping of the RF distribution and event system are on progress in this direction. The preliminary test results and implementation details will summary in this report.

TUPD87	Fuzzy Logic Controls of a Particle Accelerator	ion, fuzzy set, monitoring, focusing	509
	O.F. Toader NERS-UM, Ann Arbor, Michigan, USA
	The ion beams produced in a particle accelerator have to be characterized and monitored using parameters specific to the instruments involved and information from practical (hands-on) operation of those instruments and of the accelerator as a whole. The control is critical considering the multitude of equipment and tasks involved. It is a nonlinear, non-standard process difficult to model. This paper will presents the progress that is currently being made in the attempt to implement fuzzy logic theory in controlling parts of the 1.7 MV Tandem particle accelerator at the Michigan Ion Beam Laboratory.

TUPD90	POMPOMs: Cost-Efficient Polarity Sensors for the MICE Muon Beamline	EPICS, monitoring, dipole, radiation	518
	J.J. Nebrensky Brunel University, Middlesex, United Kingdom P.M. Hanlet IIT, Chicago, Illinois, USA
	Funding: STFC (UK) The cooling effect in MICE (Muon Ionisation Cooling Experiment) will be studied with both positive and negative muons, reversing the electrical input to the magnets by physically swapping over the power leads. Ensuring the actual operating polarity of the beamline is correctly recorded is a manual step and at risk of error or omission. We have deployed a simple system for monitoring the operating polarity of the two bending magnets by placing in each dipole bore a Honeywell LOHET-II Hall-effect sensor that operates past saturation at nominal field strengths, and thus return one of two well-defined voltages corresponding to the two possible polarities of the magnet. The environment in the experimental hall is monitored by an AKCP securityProbe 5E system integrated into our EPICS-based controls and monitoring system. We read out the beamline polarity sensors using a voltmeter module, and translate the output voltage into a polarity (or alarm) state within EPICS whence it can be accessed by the operators and stored in the output datastream. Initial test of the LOHET-II sensors indicates they will still be able to indicate beamline polarity after radiation doses of 600 Gy (Co60). We'd like to thank Prof. Peter Hobson and Dr David Smith at Brunel University for performing the sensor irradiation
	Poster TUPD90 [0.627 MB]

TUPD96	Fast and Critical Detection Devices Planned for the Machine Protection System at the Facility for Rare Isotope Beams	linac, status, EPICS, beam-losses	533
	G. Kiupel, S. Assadi, T.D. Brown, P. Chu, J.L. Crisp, S. Peng, M.W. Stettler, Y. Zhang FRIB, East Lansing, Michigan, USA
	Funding: Work supported by US DOE Cooperative Agreement DE-SC0000661 The Facility for Rare Isotope Beams (FRIB) at Michigan State University (MSU) will use a 400 kW, heavy-ion cw linac to produce rare isotopes in support of a rich program of fundamental research. In the event of operational failures, the Machine Protection System (MPS) shuts off the beam within microseconds to control beam losses that may damage accelerator components. The operational mode is distributed to all fast and critical devices that have multiple hardware checkpoints and comparators. A relational database provides the framework for the development of the MPS management application. In this paper, we present the FRIB MPS architecture, plans and implementation.

WEOC03	Dark Current Monitor for the European XFEL	simulation, solenoid, impedance, FEL	572
	D. Lipka, W. Kleen, J. Lund-Nielsen, D. Nölle, S. Vilcins, V. Vogel DESY, Hamburg, Germany
	Dark current is produced due from field emission in the accelerator. This generates a radiation background in the tunnel which damages the electronics and activates components. To decrease the dark current different methods like kickers and collimators are used. To control the dark current level and measure and optimize the efficiency of dark current reduction dark current monitors are required. To measure the dark current a cavity was designed and built with the operation frequency of the accelerator. Here the small charge of the dark current present in every RF bucket induces and superimposes a field up to a measurable level. The cavity is proven at the PITZ facility. In addition to dark current levels down to 50 nA, the monitor allows for charge measurements resolution below pC, better than the Faraday cup. In addition the ratio of amplitudes from higher order monopole modes is a function of the bunch length. Measurements show the same trend of bunch length compared with a destructive streak camera method with comparable resolution. Therefore this monitor is able to measure bunch charge, dark current and bunch length in a non-destructive manner.
	Slides WEOC03 [0.935 MB]

Paper

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Other Keywords

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MOOC03

The Fermi@Elettra Cavity BPM System: Description and Commissioning Results

cavity, pick-up, FEL, undulator

26

M. Ferianis, A.O. Borga, P. Craievich, R. De Monte, G. Gaio, M. Predonzani
ELETTRA, Basovizza, Italy
M. Dal Forno
DIEIT, Trieste, Italy

The Fermi@elettra cavity BPM (C-BPM) system is based on an original implementation of the C-BPM scheme as the pick-up, operating at 6.5GHz, is coupled to a dedicated, self-calibrating electronics based on a novel concept. The system has been developed in-house; both the E-M and the mechanical design of the pick-up have been carried out, including an original frequency tuning scheme. The detector electronics directly obtains the envelope of the sum and difference signals by means of an RF 180° hybrid; no mixer for the RF signal down conversion is used. The detector is based on 3 blocks: an RF front-end, a baseband analogue transmission module and a digital back-end unit, based on a micro-TCA platform. The digital back-end is equipped with a powerful Virtex 5 FPGA and several real-time tasks have been implemented on it, including intra-pulse calibration. Ten C-BPM stations have been installed so far, fully integrated in the FERMI control System, enabling a real-time control of this key FEL diagnostics. Results on performances with beam are also presented; the scale factor of C-BPMs is obtained with beam, as two-axis micrometer translation stages have been installed.

Slides MOOC03 [2.733 MB]

MOPD01

Beam Diagnostics for the NSLS-II Booster

pick-up, booster, betatron, vacuum

29

V.V. Smaluk
BINP, Novosibirsk, Russia
E.A. Bekhtenev, V.P. Cherepanov, G.V. Karpov, V. Kuzminykh, O.I. Meshkov
BINP SB RAS, Novosibirsk, Russia
I. Pinayev, O. Singh, K. Vetter
BNL, Upton, Long Island, New York, USA

For successful commissioning and effective operation of the projected NSLS-II Booster, a set of beam diagnostic instruments has been designed. Fluorescent screens are used for the Booster commissioning and troubleshooting. Closed orbit is measured using electrostatic BPMs with turn-by-turn capability. The circulating current and beam lifetime are measured using a DC current transformer. The fill pattern is monitored by a fast current transformer. Visible synchrotron radiation is registered for observation of the beam image. Betatron tunes are measured using two pairs of striplines, the first pair is for beam excitation and the second one – for beam response measurement. Design and performance of the Booster beam instrumentation are described.

MOPD02

The CNAO Qualification Monitor

extraction, synchrotron, power-supply, proton

32

C. Viviani, G. Balbinot, J. Bosser, M. Caldara, H. Caracciolo, M.A. Garella, V. Lante, A. Parravicini, M. Pullia
CNAO Foundation, Milan, Italy

The CNAO (Centro Nazionale di Adroterapia Oncologica) Foundation is the first Italian center for deep hadrontherapy. It will treat patients using Protons and Carbon ions in the next coming months. Patient safety is the first priority and many diagnostics devices have been developed to guarantee it. This work presents the so-called Qualification Monitor (QM). It is mounted in the common part of the four extraction lines, in front of the Chopper Dump, and it aims to qualify the extracted beam profile and intensity, before sending it to the treatment rooms. It is made of two different detectors: the first one, called Qualification Profile Monitor (QPM), is made by two dimensional harp of scintillating fibers to measure horizontal and vertical profiles. The second one, named Qualification Intensity Monitor (QIM) is a scintillating plate for intensity measurement. At the beginning of each extracted spill the beam is dumped on the Chopper Dump and it hit the QM. Only a positive result from beam qualification allows to switch on Chopper magnets and to send the beam to the patient. The QM is working with beam from some months, first results and future upgrades are presented.

MOPD10

A Calibration Method for the RF Front-end Asymmetry of the DBPM Processor

target, pick-up, instrumentation, factory

56

X. Yi, L.W. Lai, Y.B. Leng, Y.B. Yan, N. Zhang
SSRF, Shanghai, People's Republic of China
Z.C. Chen
SINAP, Shanghai, People's Republic of China

Digital Beam Position Monitor (DBPM) processor, designed to measure the beam positions in the LINAC, booster and the storage ring of a particle accelerator, has been used in many synchrotron radiation facilities. Channels asymmetry, which deteriorates the performance of the DBPM, is inevitable since the RF front-end needs four exactly same blocks. Recently, an RF front-end board for DBPM has been made with calibration circuit which clears the switching noise. The calibration method will be described in detail, including an overview of the RF board. The beam current dependence, which is sensitive to channels asymmetry, decreases from 160μm to 25μm after the calibration in the lab test.

Poster MOPD10 [1.682 MB]

MOPD11

High Resolution BPM Upgrade for the ATF Damping Ring at KEK

damping, closed-orbit, injection, diagnostics

59

N. Eddy, C.I. Briegel, B.J. Fellenz, E. Gianfelice-Wendt, P.S. Prieto, R. Rechenmacher, A. Semenov, D.C. Voy, M. Wendt, D.H. Zhang
Fermilab, Batavia, USA
N. Terunuma, J. Urakawa
KEK, Ibaraki, Japan

Funding: Work is supported by the joint high energy physics research program of Japan-USA, and by FNAL, operated by Fermi Research Alliance LLC under contract #DE-AC02-07CH11359 with the US Dept. of Energy.
A beam position monitor (BPM) upgrade at the KEK Accelerator Test Facility (ATF) damping ring has been accomplished, carried out by a KEK/FNAL/SLAC collaboration under the umbrella of the global ILC R&D effort. The upgrade consists of a high resolution, high reproducibility read-out system, based on analog and digital down-conversion techniques, digital signal processing, and also implements a new automatic gain error correction schema. The technical concept and realization as well as results of beam studies are presented.

MOPD20

Applicability of the AM-PM Conversion Method to Beam Position Monitoring of Electron Beams accelerated in S-Band Frequency Range

electron, pick-up, insertion, monitoring

86

M. Ruf, P. Quednau, L. Schmidt
U. Erlangen-Nurnberg LHFT, Erlangen, Germany
S. Setzer
Siemens Med, Erlangen, Germany

Funding: Work supported by Bayerische Forschungsstiftung in the project "MEDieMAS - Effiziente Bestrahlungsgeräte für Krebstherapie (Efficient radiation systems for cancer therapy)", file number AZ-735-07
In this paper, the applicability of the amplitude-to-phase-conversion (AM-PM) method to beam position monitoring (BPM) purposes in S-Band frequency range is investigated. The proof-of-principle experiment is done by AM-PM-processing of capacitive pickup signals generated by a 6 MeV S-Band electron beam. It is demonstrated that the AM-PM-output pulsed DC signal is proportional to transverse beam offsets. Furthermore, design considerations and selection criteria of appropriate RF devices are described. Additionally, results of cold measurements of a planar 2-channel AM-PM-receiver module are presented indicating that the applicability will also be given for even higher frequency ranges.

MOPD21

Overview of the BPM System of the ESS-Bilbao

EPICS, linac, LLRF, impedance

89

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
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

The BPM system from ESS-Bilbao is presented, including test bench, electronics and test results. Our test bench implements 4 capacitive buttons welded to the beam pipe. The position of the internal tube simulating the beam can be changed with respect to the outer tube within a range of 20 mm, with a resolution less than 10 μm. It is connected to an Analog Front-End (AFE) where signals are conditioned and converted to baseband and a Digital Unit (DU) to sample them and calculate the position and phase. The AFE is based on logarithmic amplifiers and IQ demodulators. Signals are converted from differential to single-ended and conditioned to meet the DU requirements (FPGA and ADC). DU includes offset compensation, gain adjustment, CORDIC, delta over σ algorithm and linearization blocks. To manage the FPGA a Java interface has been developed including also the EPICS integration by means of JavaIOC and a MySQL interface. The resolution and accuracy results are promising (less than 10 μm and 1° for the position and phase) provided that the effect of several errors such as temperature variations and nonlinearities are minimized through temperature regulation and system calibration.

Poster MOPD21 [1.476 MB]

MOPD23

Photon BPM Electronics Development at Taiwan Light Source

photon, injection, feedback, diagnostics

95

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

Photon BPMs are very useful for photon beam position and stability observation. There are several kinds of photon BPMs and electronics with different design installed at beamline front-ends at the Taiwan Light Source. To provide a better integration and efficient usage of the photon BPM, a commercial BPM electronics - Libera Photon was chosen for an integral solution and has showed at least one micron performance for several months of testing. In this report, the installation process and testing results of the photon BPM will be presented.

Poster MOPD23 [0.595 MB]

MOPD26

Testing of New Hadron Beam Phase and Position Monitor at CIEMAT Laboratory

instrumentation, pick-up, monitoring, feedback

104

M. Znidarcic, B.B. Baricevic, R. Hrovatin
I-Tech, Solkan, Slovenia
J.M. Carmona, A. Ibarra, I. Podadera
CIEMAT, Madrid, Spain

The Libera Single Pass H is the new instrumentation intended for phase, position and charge monitoring in hadron and heavy ion LINACs and transfer lines. Initial measurements and verification of the instrumentation performance were conducted in the laboratory at Instrumentation Technologies. Characterization measurements of the same electronics were later carried out at CIEMAT laboratory. The measurements were performed on a CIEMAT wire test bench with the 175 MHz pulsed signal connected to the wire. Different measurements were performed on the test bench; First, by moving the wire over larger displacements and checking the position and, later, by changing the signal phase and performing the phase shift measurement. This article discusses the new Libera Single Pass H electronics, the tests carried out in the test bench and the performance obtained.

MOPD31

Future Timing and Synchronization Scheme at ELBE

laser, electron, radiation, gun

116

M. Kuntzsch, A. Büchner, T. Kirschke, U. Lehnert, F. Röser
HZDR, Dresden, Germany

The Radiation Source ELBE at Helmholtz-Zentrum Dresden-Rossendorf is currently extended to offer capacity for new experiments. The reconstruction includes the setup of a THz-beamline with a dedicated user laboratory and a beamline for electron-beam - high-power laser experiments. The current synchronization scheme offers stability to the picoseconds level. The new experiments require a femtosecond synchronization in order to get field-strength resolved THz-probes and to have a stable overlap between the electron-bunches with the laser pulses. In the future there will be a MIT/DESY-like system [1] with a pulsed fiber laser as an optical reference oscillator. The laser pulses will be distributed over stabilized fiber links to the remote stations. Later on it is planned to install EOM-based beam arrival time monitors (BAMs) in order to monitor the bunch jitter and to establish a feedback system to reduce the jitter. Besides that, the timing system has to be revised to trigger experiments with low repetition rate, two guns (thermionic DC, superconducting RF) and lasers. The Poster will show the Layout of the possible future Timing and Synchronization System at ELBE.
[1] J. Kim, J.A. Cox, J.J. Chen, F.X. Kärtner, "Drift-free femtosecond timing synchronization of remote optical and microwave sources", Nature Photonics, Vol. 2, pp. 733-736 (2008).

MOPD40

Beam Measurements with Visible Synchrotron Light at VEPP-2000 Collider

collider, diagnostics, electron, positron

140

Yu. A. Rogovsky, D.E. Berkaev, I. Koop, A.N. Kyrpotin, I. Nesterenko, A.L. Romanov, Y.M. Shatunov, D.B. Shwartz
BINP SB RAS, Novosibirsk, Russia

This paper describes beam diagnostics at VEPP-2000 collider, based on visible synchrotron light analysis. These beam instruments include: SR beamline and optics; acquisition tools and high resolution CCD cameras distributed around the storage ring to measure the transverse beam profile and its position in vacuum chamber; photomultiplier tubes (PMT) which enables beam current measurements. Some applications of these measurement systems and their measurement results are presented.

Poster MOPD40 [0.599 MB]

MOPD41

A Fast CVD Diamond Beam Loss Monitor for LHC

radiation, collimation, beam-losses, instrumentation

143

E. Griesmayer, B. Dehning, D. Dobos, E. Effinger, H. Pernegger
CERN, Geneva, Switzerland

Chemical Vapour Deposition (CVD) diamond detectors were installed in the collimation area of the CERN LHC to study their feasibility as Fast Beam Loss Monitors in a high-radiation environment. The detectors were configured with a fast, radiation-hard pre-amplifier with a bandwidth of 2 GHz. The readout was via an oscilloscope with a bandwidth of 1 GHz and a sampling rate of 5 GSPS. Despite the 250 m cable run from the detectors to the oscilloscope, single MIPs were resolved with a 2 ns rise time, a pulse width of 10 ns and a time resolution of less than 1 ns. Two modes of operation were applied. For the analysis of unexpected beam aborts, the loss profile was recorded in a 1 ms buffer and, for nominal operation, the histogram of the time structure of the losses was recorded in synchronism with the LHC period of 89.2 μs. Measurements during the LHC start-up (February to December 2010) are presented. The Diamond Monitors gave an unprecedented insight into the time structure of the beam losses resolving the 400 MHz RF frequency as well as the nominal bunch separation of 25 ns. In future, these detectors will be used to study ghost bunches and particles in the 3 μs abort gap.

MOPD55

SEM-GRID Prototype Electronics using Charge-Frequency-Converters

diagnostics, ion, radiation, monitoring

176

M. Witthaus, J. Adamczewski-Musch, H. Flemming, J. Frühauf, S. Löchner, H. Reeg, P. Skott
GSI, Darmstadt, Germany

A prototype system using an ASIC equipped with 8 Charge-to-Frequency Converters (CFC) was developed in collaboration between the Beam Diagnostics and Experiment Electronics Department at GSI. The maximum sensitivity is 250 fC per output pulse. It will serve as an economic alternative for the readout electronics of Secondary Electron Monitor (SEM)profile grids or comparable beam diagnostic devices like Multi-Wire Proportional Chambers (MWPC). The goal of this contribution is to report on a detailed performance test under real beam conditions at GSI beam lines. A 32-channel electronics is connected to different beam profile SEM-grids at a LINAC beam line and tested with various beam conditions. Transversal beam profiles with a time resolution down to the microsecond range have been recorded successfully. Beam profiles recorded with the new CFC-board and the old standard trans-impedance amplifiers agreed well. Further measurements were done with Multi-Wire Proportional Chamber. Therefore the prototype was extended to 64-input channels recently.

Poster MOPD55 [1.344 MB]

MOPD60

Beam Induced Fluorescence (BIF) Monitors as a Standard Operating Tool

ion, photon, diagnostics, heavy-ion

185

C.A. Andre, F. Becker, H. Bräuning, P. Forck, R. Haseitl, R. Lonsing, B. Walasek-Höhne
GSI, Darmstadt, Germany

For high current operation at the GSI Heavy Ion UNILAC non intercepting methods for transverse beam profile determination are required. The Beam Induced Fluorescence (BIF) Monitor, an optical measurement device based on the observation of fluorescent light emitted by excited gas molecules was brought to routine operation. Detailed investigations were conducted for various beam parameters to improve the electronics and the optical setup. Up to now, four BIF monitor stations (for detection of both, horizontal and vertical beam profiles) were installed at UNILAC and two additional setups are planned. This contribution reports on first upgrades of the BIF monitors with a Siemens PLC for FESA-based slow controls and hardware protection procedures. The versatile control and display software ProfileView is presented as an easy-to-use and stable beam diagnostic tool for the GSI operating team.

Poster MOPD60 [3.060 MB]

MOPD64

High Quality Measurements of Beam Lifetime, Instant-Partial-Beam Losses and Charge-Accumulation with the New ESRF BPM System

injection, cavity, beam-losses, storage-ring

194

K.B. Scheidt, F. Ewald, B. Joly
ESRF, Grenoble, France

The BPM system of the ESRF Storage Ring, that was entirely replaced by 224 units of the Libera-Brilliance system in 2009, is now also being used for precise and fast measurements of the Beam Lifetime and so-called Instant-Partial-BeamLosses. This is possible by the use of the Sum signal of the four BPM buttons on each of the 224 BPM stations in the Ring. This paper will describe the strong advantages in terms of response time, but also the precautions and the limitations of this particular use. Results will show the ultimate attainable performances and a detailed comparison with that of three independent DC current transformers also installed in the Ring. The same Sum signal is also usable for precise measurement of Accumulated Charge during the injection process and results of this will also be presented.

MOPD68

Pickup Beam Measurement System at the VEPP-2000 Collider

collider, betatron, injection, positron

203

Yu. A. Rogovsky, E.A. Bekhtenev
BINP SB RAS, Novosibirsk, Russia

This paper reviews the present state of electromagnetic beam position monitors (pickups) at VEPP-2000 collider. It includes descriptions of position monitors, typical interfaces for these monitors and their system characteristics (resolution, stability, bandwidth and problems or limitations) are discussed. The paper also reviews several types of diagnostic measurements using beam position monitors which are useful in improving accelerator operations.

Poster MOPD68 [0.398 MB]

MOPD71

Using the Transverse Digital Damper as a Real-time Tune Monitor for the Booster Synchrotron at Fermilab

booster, damping, kicker, synchrotron

209

N. Eddy, O. Lysenko
Fermilab, Batavia, USA

The Fermilab Booster is a fast ramping (15Hz) synchrotron which accelerates protons from 400MeV to 8GeV. During commissioning of a transverse digital damper system, it was shown that the damper could provide a measurement of the the machine tune throughout the cycle by exciting just 1 of the 84 bunches with minimal impact on the machine operation. The algorithms used to make the measurement have been incorporated into the damper FPGA firmware allowing for real-time tune monitoring of all Booster cycles.
Operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy.

MOPD75

Compact Reconfigurable FPGA Based Beam Current Safety System for UCN

target, monitoring, kicker, EPICS

218

P.-A. Duperrex
PSI, Villigen, Switzerland

At PSI, a new and very intensive Ultra-Cold Neutron (UCN) source based on the spallation principle was commissioned in December 2010 and will start production in 2011. The 590 MeV, 1.3 MW proton beam will be switched towards the new spallation target for about 8 s every 800 s. A beam current monitoring system has been developed as part of a safety system for the UCN source operation. This monitoring system is based on a reconfigurable FPGA system from National Instrument. This paper will present the advantages of such a system compared to analog electronics, its flexibility to future new performance requests and the integration details in the safety control system.

MOPD76

The Petra III Fast Orbit Feedback System

feedback, instrumentation, injection, brilliance

221

J. Klute, K. Balewski, H.T. Duhme, H. Tiessen, F. Wierzcholek
DESY, Hamburg, Germany

Orbit stability is a crucial and import issue of 3rd generation light sources. Ambient mechanical and electrical noise cause rather large orbit distortions which have to be counteracted by an orbit feedback. Extensive studies of the orbit distortions in PETRA III have shown that the frequencies of the ambient noise lie within a frequency range from about 0.01Hz to 100Hz. In this paper we describe the main components, their properties and the layout of PETRA III’s orbit feedback. Furthermore experimental results on short and long term stability will be presented. It will be shown that the required orbit stability of ±0.5 μm in the vertical plane can be maintained over 50 h.

MOPD78

Synchronous Measurement of Stability of Electron Beam, X-ray Beam, Ground and Cavity Voltage

cavity, electron, feedback, photon

227

G. Rehm, M.G. Abbott, C. Bloomer, I. Uzun
Diamond, Oxfordshire, United Kingdom

We have developed hardware and software that allows continuous and synchronous recording of electron and X-Ray beam position as well as cavity voltage and ground vibrations at a rate of about 10kS/s for periods of many days. To this end, additional nodes have been added to our existing fast network that feeds the Fast Orbit Feedback System, namely tungsten vane type front end XBPMs, RF cavity pickups and accelerometers. The synchronous nature of these measurements shows the correlation between electron beam motion through an insertion device and observed X-ray beam motion in the frontend or orbit distortions caused by fluctuations of the RF cavity voltage. While the additional channels currently are only observed, the potential of including these in the fast orbit feedback will be discussed.

MOPD86

Development of FESA-based Data Acquisition and Control for FAIR

diagnostics, synchrotron, high-voltage, power-supply

248

R. Haseitl, H. Bräuning, T. Hoffmann, K. Lang, R. Singh
GSI, Darmstadt, Germany

GSI has selected the CERN Front End Software Architecture (FESA) to operate future beam diagnostic devices for the upcoming FAIR facility. The FESA framework is installed and operational at the GSI site, giving equipment specialists the possibility to develop FESA classes for device control and data acquisition. This contribution outlines first developments of FESA-based systems for various applications. Prototype DAQ systems based on FESA are the BPM system of the synchrotron SIS18 with data rates up to 7 GBit/s and a large scaler setup for particle counters called LASSIE. FESA classes that address gigabit Ethernet cameras are used for video imaging tasks like scintillator screen observation. Control oriented FESA classes access industrial Programmable Logic Controllers (PLCs) for the slow control of beam diagnostic devices. To monitor temperatures and set fan speeds of VME crates, a class communicating over the CAN bus has been developed.

Poster MOPD86 [3.137 MB]

MOPD87

The LHC Beam Presence Flag System

injection, impedance, monitoring, feedback

251

M. Gasior, T.B. Bogey
CERN, Geneva, Switzerland

Before injecting any high intensity bunches into the LHC a circulating low intensity pilot bunch must be present to confirm the correct settings of the main machine parameters. For the 2010 LHC run the detection of this pilot beam was done with the beam current transformer system. To increase redundancy of this important safety function a dedicated beam presence flag system was designed, built and tested with beam to be used operationally in the 2011 run. In this system signals from four electrodes of a beam position monitor (BPM) are processed with separate channels, resulting in a quadruple system redundancy for either beam. Each system channel consists of an analogue front-end converting the BPM signals into two logic states, which are then transmitted optically to the machine protection and interlock systems. For safety reasons the system does not have any remote control or adjustable elements and its only inputs are the beam signals. This paper describes the new LHC beam presence flag system, in particular the analogue front-end based on diode peak detectors.

Poster MOPD87 [8.200 MB]

MOPD92

Review of Recent Upgrades & Modernizations on Diagnostics in the ESRF Storage Ring and Injector

booster, storage-ring, diagnostics, vacuum

263

B. Joly, P. Arnoux, D. Robinson, K.B. Scheidt
ESRF, Grenoble, France

Over the last two years a number of upgrades and modernizations have been implemented on diagnostic tools in both the Injector system and the Storage Ring. Brand new diagnostic tools have also been added. In the Injector, a new Transfer Line current monitor has been installed, as well as four new ¼ λ Striplines equipped with Single-Pass Libera electronics. In the Storage Ring, a new Visible Light Mirror (VLM) system has replaced the original system that had been in place for more than 15 years. Also, the acquisition system for the DC Current Transformers has been upgraded with new hardware. Descriptions and results are presented on the improved reliability, sensitivity and resolution of these systems.

TUOB01

Options for Next Generation Digital Acquisition Systems

instrumentation, factory, target, insertion

289

A. Boccardi
CERN, Geneva, Switzerland

Digital acquisition system designers have an always increasing number of options in terms of bus standards and digital signal processing hardware among which to choose. This allows for a high flexibility but also open the door to a proliferation of different architectures, potentially limiting the reusability and the design synergies among the various instrumentation groups. This contribution illustrates the design trends in some of the major institutes around the world with design examples including VME, PCI and μTCA based modular systems using AMC and/or FMC mezzanines. Some examples of FPGA design practices aimed to increase reusability of code will be mentioned together with some of the tools already available to designers to improve the information exchange and the collaboration, like the Open Hardware Repository project.

Slides TUOB01 [3.543 MB]

TUOB03

Next Generation Electronics based on μTCA for Beam-Diagnostics at FLASH and XFEL

diagnostics, feedback, laser, low-level-rf

294

P. Gessler, M.K. Bock, M. Bousonville, M. Felber, M. Hoffmann, T. Jezynski, T. Lamb, F. Ludwig, G. Petrosyan, L.M. Petrosyan, K. Rehlich, S. Schulz, P. Vetrov, M. Zimmer
DESY, Hamburg, Germany
C. Bohm, A. Hidvégi
Stockholm University, Stockholm, Sweden
K. Czuba
Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland
D.R. Makowski
TUL-DMCS, Łódź, Poland

Funding: This work is partly supported by IRUVX-PP an EU co-funded project under FP7 (Grant Agreement 211285).
Almost all accelerator-related diagnostic and steering systems require front-end electronic hardware and software for digitizing, synchronization, processing, controlling, and providing access to the control system. Increasingly high demands on resolution, bandwidth, stability, redundancy, low latency, real-time processing and distribution create the need for new technologies in order to fulfill those demands. For this reason, at the European XFEL and FLASH, the new, μTCA industry standard will be deployed. Over the last few years, significant achievements have been made in μTCA developments in collaboration with other research institutes and industry. In this paper, we give an overview of the required components of a typical μTCA system for diagnostics applications. The FLASH bunch arrival-time monitor will be used as an example.

Slides TUOB03 [9.075 MB]

TUPD06

Beam Diagnostic Overview of the SPIRAL2 RNB Section

ion, electron, target, ion-source

314

C. Jamet, T.A. André, E. Guéroult, B. Jacquot, N. Renoux, A. Savalle, T. Signoret, F. Varenne, J.L. Vignet
GANIL, Caen, France
J.-M. Fontbonne
LPC, Caen, France

An extension to the existing GANIL facility in Caen, France is under construction. The new SPIRAL 2 construction will be realized in two phases, for the first phase the construction started in January 2011 and will consists of the accelerator buildings with two experimental facilities S3 and Neutrons for science (NFS). The second phase is the so called production building where radioactive ions are produced through the ISOL (Isotope Separation On Line) method. The produced radioactive ion beams (RIBs) will be extracted and accelerated up to 60keV from the ion sources, after beam purification the beam will be driven in the secondary beam lines either to a new experimental facility DESIR (Decay, excitation and storage of radioactive ions) constructed during the second phase of the new installation or the RIBs will be charge breed to form multi-charged ions that will be driven to the existing GANIL facility and post accelerated in the CIME cyclotron. This overview article gives a description of the secondary beam lines, the foreseen beam diagnostics which will allow tuning and controlling the radioactive ion beams in the secondary beam lines constructed in the SPIRAL2 Phase 2.

TUPD11

Developments for IFMIF/EVEDA LIPAc Beam Position Monitors: The Sensors at the MEBT and the Wire Test Bench

pick-up, linac, quadrupole, simulation

320

I. Podadera, J.M. Carmona, A. Guirao, A. Ibarra, L.M. Martinez Fresno, E. Mirones, R. Unamuno, J.G.S. de la Gama
CIEMAT, Madrid, Spain

Funding: This work has been partially supported by the Spanish Ministry of Science and Innovation under Project ENE2009-11230
The IFMIF-EVEDA accelerator will be a 9 MeV, 125 mA CW deuteron accelerator which aims to validate the technology that will be used in the future IFMIF accelerator. In the Medium Energy Beam Transport line (MEBT) connecting the RFQ and the MEBT, non-interceptive Beam Position Monitors pickups (MBPMs) will measure the transverse position and phase in order to maximize the transport efficiency of the beamline. The response of the MBPMs must be optimized for a beam current for 5 MeV, and a peak beam current of 125 mA. Due to the lack of space in the MEBT, the MBPMs will be located inside the magnets. The MBPMs will have to fit inside the magnets without perturbing the magnetic field. In this contribution, the electromagnetic and mechanical design of the MBPM will be presented. In addition, in order to validate and characterize all the BPMs type of IFMIF/EVEDA once they are manufactured, a wire test bench has been constructed and verified at CIEMAT. The design and validation results of the test bench will be discussed.

TUPD15

Technology Selection for the Beam Position Tuning System in Hadrontherapy Facilities

electron, photon, high-voltage, proton

332

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

Funding: CYCIT – IN2P3: AIC10-D-000518
The Beam Delivery System of some hadrontherapy facilities is characterized by having scanning magnets, which move the beam in order to irradiate all the tumor volume. To control the beam position, a Beam Position Monitor (BPM) is needed. 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 possible photodiodes able to read the light emitted by the scintillating fiber, and the tests performed in order to find the most suitable photodiode to measure the beam position from the variations in the beam current. The setup used for the tests comprises a Sr-90 source, which emits electrons, a scintillating fiber, converting these electrons into photons, and a photodiode, which detects the photons leaving the fiber. The photodiodes studied have been of two types: Avalanche Photodiode (APD) and Multi Pixel Photon Counter (MPPC). In this paper both photodiodes are compared and the results are presented.

TUPD19

Initial Tests of New Electron and Photon Beam Position Monitor Electronics at the Advanced Photon Source

photon, brilliance, injection, electron

344

P. Leban
I-Tech, Solkan, Slovenia
G. Decker
ANL, Argonne, USA

Funding: Use of the APS, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science by ANL, was supported by the U.S. DOE under Contract No. DE-AC02-06CH11357
Measurements were done at the Advanced Photon Source (APS) with Libera Brilliance+, connected to the small-aperture insertion device vacuum chamber pickup electrodes near the beamline 35-ID source point. A photoemission-based photon beam position monitor located 16.35 meters downstream of the center of the ID straight section was also monitored using Libera Photon electronics in horizontal/vertical configuration. Top-up injection transients were recorded simultaneously on both units, providing details about the electron and photon beam motions before, during, and after injection in the storage ring and beamline front end. FFT spectra from the APS-developed BSP-100 broadband BPM data acquisition electronics were compared with the Libera instruments. This article discusses the calibration procedure for electron and photon beam position monitors along with results of these measurements.

TUPD21

Frontend Measurements and Optimizations at Libera Brilliance BPM Electronics during Commissioning of the Petra III Synchrotron Light Source

brilliance, instrumentation, feedback, synchrotron

350

F. Schmidt-Föhre, G. Kube, J.M. Maass, K. Wittenburg
DESY, Hamburg, Germany

New 3rd generation synchrotron light sources like Petra III utilize high-accuracy beam position measurement (BPM) systems to achieve the desired precision for beam position measurement and control, as needed for electron/positron beam stability and brilliance of the delivered photon beam. To reach the design goals, specifically adapted and parameterized commercial-of-the-shelf (COTS) Libera Brilliance BPM processor electronics are used within the Petra III BPM system. Quality of the acquired position measurement and orbit control data is highly dependent on the properties and setup of the analog and digital frontend of such BPM electronics. This paper shows influences and optimizations at the BPM system frontend of the Petra III light-source in reference to corresponding measurements done during the accelerator commissioning phase.

TUPD23

New Bunch-by-Bunch Feedback System for the TLS

feedback, diagnostics, EPICS, kicker

353

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

FPGA based bunch-by-bunch feedback systems were deployed in 2005-2006 by using SPring-8 designed feedback processors for the Taiwan Light Source. To provide spare units and explore integrate with the control system in the EPICS toolkit environment, feedback processors from the Dimtel were setup. The new system can be swap with the existed system by simple cable re-connection and integrated with the EPICS system in seamless way. Rich functionality except the basic feedback function includes excitation of individual bunch or specifies bunches, averaged spectrum, tune measurement by the feedback dip in the averaged spectrum, fill pattern measurement, etc. are explorer. Current stage implementation and features of the system will summary in this report.

TUPD35

Development of an Alternative, Photodiode-Based, Femtosecond Stable Detection Principle for the Link Stabilization in the Optical Synchronization Systems at FLASH and XFEL

laser, FEL, feedback, status

380

T. Lamb, M.K. Bock, M. Bousonville, M. Felber, P. Gessler, F. Ludwig, S. Ruzin, H. Schlarb, B. Schmidt, S. Schulz
DESY, Hamburg, Germany

Funding: This work is partly supported by IRUVX-PP an EU co-funded project under FP7 (Grant Agreement 211285).
The fs-stable timing information in the optical synchronization system at FLASH and the upcoming European XFEL is based on the distribution of laser pulses in optical fibers. The optical length of the fibers is continuously monitored and drifts in signal propagation time are actively compensated in order to provide a phase stable pulse train at the end of the fiber link. At present, optical cross-correlation is used to measure the optical length changes. To overcome some of the disadvantages of the current scheme, a different approach for the detection of the optical fiber link length variation was developed. This new scheme uses 10GHz photodiodes to measure the amplitude modulation of harmonics created by overlapping two pulse trains. The long-term stability of the prototype of this detector over 33h was demonstrated to be below 5fs (peak-to-peak) with a rms jitter of about 0.86fs. The detection principle itself is practically insensitive to environmental influences and needs only about 10% of the optical power, compared to the optical cross-correlator.

TUPD43

XFEL Beam Loss Monitor System

electron, beam-losses, undulator, high-voltage

401

A. Kaukher, I. Krouptchenkov, B. Michalek, D. Nölle, H. Tiessen
DESY, Hamburg, Germany

European XFEL will have a sophisticated Machine Protection System, part of which - Beam Loss Monitors(BLM). The monitors will detect losses of electron beam, in order to protect the components of the XFEL from damage and excessive activation. For protection of undulators, BLMs with a scintillator bar will be used. BLMs at places with high radiation load will be equipped with fused silica rods. Beam dumps of the XFEL will be instrumented with glass-fiber BLMs. The BLMs were tested with an electron test-beam at DESY, as well as at FLASH. Due to large amount of light produced by scintillator and high gain of the used photomultiplier, no optical grease is needed in front of the photomultiplier' window, while typical cathode voltage is only 500-600 volt. The prototype with quartz glass was typically operated at higher cathode voltage. Good operation of all three types of BLMs prototypes was obtained. It is planned to use same monitors also for the FLASH2 project. Current status of the XFEL BLM system development will be presented.

TUPD44

LHC Beam Loss Monitoring System Verification Applications

monitoring, collider, feedback, survey

404

E. Fadakis, B. Dehning, S. Jackson, C. Zamantzas
CERN, Geneva, Switzerland

The LHC Beam Loss Monitoring (BLM) system is one of the most complex instrumentation systems deployed in the LHC. In addition to protecting the collider, the system also needs to provide a means of diagnosing machine faults and deliver a feedback of losses to the control room as well as to several systems for their setup and analysis. It has to transmit and process signals from almost 4’000 monitors, and has nearly 3 million configurable parameters. The system was designed with reliability and availability in mind. The specified operation and the fail-safety standards must be guaranteed for the system to perform its function in preventing superconductive magnet destruction caused by particle flux. Maintaining the expected reliability requires extensive testing and verification. In this paper we report our most recent additions to the numerous verification applications. The developments have been made using LabVIEW and CERN custom made libraries and allow the user to connect either directly to the front end computer (FEC) or through a dedicated server.

TUPD56

High Resolution SR Profile Monitor at ATF2 Extraction Line

extraction, emittance, background, damping

434

T. Naito, T.M. Mitsuhashi
KEK, Ibaraki, Japan

The profile monitor using visible light of the SR at ATF2 extraction line has been developed. KEK-ATF is a facility to produce extremely low emittance beam for the linear collider. The emittance in the damping ring is ex=1x10^-9 m and ey=1x10{-11} m, respectively. The ATF2 extraction line is a transport line to study the Final focus system for the linear collider. The designed beam size at the profile monitor is 230 μm in horizontal and 13 μm in vertical. We used a wide aperture optical system to reduce the Rayleigh limit of the optical system. The performance of the monitor is reported.

TUPD61

Multi Optical Transition Radiation System for ATF2

emittance, target, coupling, extraction

446

C. Blanch Gutierrez, J. Alabau-Gonzalvo, A. Faus-Golfe, J.J. García-Garrigós
IFIC, Valencia, Spain
J. Cruz, D.J. McCormick, G.R. White, M. Woodley
SLAC, Menlo Park, California, USA

Funding: FPA2010-21456-C02-00
In this paper we describe the calibration tests, software development and first measurements of a Multi Optical Transition Radiation System in the beam diagnostic section of the Extraction (EXT) line of ATF2, close to the multi wire scanner system. First 2D emittance measurements have been made with success and the system is being used normally for coupling correction. 4D emittance reconstruction algorithm is under improvement and implementation before a systematic measurement campaign and comparison with wire scanners is done. This will be a definitive test of the OTR as a beam emittance diagnostic device, which will give the ability to measure the beam emittance with high statistics, giving a low error and a good understanding of emittance jitter.

TUPD64

Test Measurements of a 20 m/s Carbon Wire Beam Scanner

vacuum, simulation, feedback, acceleration

452

M. Koujili, J. De Freitas, B. Dehning, J. Emery, J.F. Herranz Alvarez, D. Ramos, M. Sapinski
CERN, Geneva, Switzerland
Y. Ait Amira
UFC, Besançon, France
A. Djerdir
UTBM, Belfort, France

This paper presents the design of the actuator for the fast and high accuracy Wire Scanner system. The actuator consists of a rotary brush-less synchronous motor with the permanent magnet rotor installed inside the vacuum chamber and the stator installed outside. The fork, permanent magnet rotor and two angular position sensors are mounted on the same axis and located inside the beam vacuum chamber. The system has to resist a bake-out temperature of 200°C and ionizing radiation up to tenths of kGy/year. Maximum wire travelling speed of 20 m/s and a position measurement accuracy of 4 μm is required. Therefore, the system must avoid generating vibration and electromagnetic interference. A digital feedback controller will allow maximum flexibility for the loop parameters and feeds the 3-phase linear power driver. The performance of the presented design is investigated through simulations and experimental tests.

TUPD73

Fast Orbit Stabilization System for Tandem APPLE-II Undulators at the KEK-PF

kicker, undulator, power-supply, polarization

479

T. Obina, K. Harada, R. Takai
KEK, Ibaraki, Japan

A rapid-polarization switching source has been developed in the KEK-PF 2.5-GeV electron storage ring. The source consists of two tandem APPLE-II type elliptically polarizing undulators (EPU) and five fast kicker magnets. The kicker magnets produce a local bump orbit at the frequency up to 100 Hz. Amplitude and phase of these magnets must be tuned precisely in order to minimize the leakage of residual orbit outside of the kicker bump. A fast orbit stabilization system which consists of ADC/FPGA/DAC are also developed to reduce the remaining orbit fluctuations in vertical and horizontal planes. In this paper, design and the preliminary result of the fast orbit compensation system is presented.

TUPD79

Preliminary Tune Feedback Study in the Taiwan Light Source

feedback, insertion, insertion-device, undulator

491

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

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. There is global orbit feedback to solve global orbit problem. In the tune shift, the tune feedback will be proposed to make up it for various insertion devices operation. The stable tune measurement and compensation will be discussed in this report.

TUPD86

RF Reference Distribution and Timing System for the Taiwan Photon Source

gun, linac, synchrotron, booster

506

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

Taiwan Photon Source (TPS) is a low-emittance 3-GeV synchrotron light source with circumference of 518.4 m (24 straight sections for installation of insertion devices), radio-frequency cavities and electron beam from the 150 MeV linac system which being in construction at National Synchrotron Radiation Research Center (NSRRC) campus. A high stability of the novel fiber based 500 MHz RF reference distribution is required and planned to use. Timing system for the TPS will be an event based system. It is based on 6U CompactPCI form factor from Micro-Research Finland Oy. Prototyping of the RF distribution and event system are on progress in this direction. The preliminary test results and implementation details will summary in this report.

TUPD87

Fuzzy Logic Controls of a Particle Accelerator

ion, fuzzy set, monitoring, focusing

509

O.F. Toader
NERS-UM, Ann Arbor, Michigan, USA

The ion beams produced in a particle accelerator have to be characterized and monitored using parameters specific to the instruments involved and information from practical (hands-on) operation of those instruments and of the accelerator as a whole. The control is critical considering the multitude of equipment and tasks involved. It is a nonlinear, non-standard process difficult to model. This paper will presents the progress that is currently being made in the attempt to implement fuzzy logic theory in controlling parts of the 1.7 MV Tandem particle accelerator at the Michigan Ion Beam Laboratory.

TUPD90

POMPOMs: Cost-Efficient Polarity Sensors for the MICE Muon Beamline

EPICS, monitoring, dipole, radiation

518

J.J. Nebrensky
Brunel University, Middlesex, United Kingdom
P.M. Hanlet
IIT, Chicago, Illinois, USA

Funding: STFC (UK)
The cooling effect in MICE (Muon Ionisation Cooling Experiment) will be studied with both positive and negative muons, reversing the electrical input to the magnets by physically swapping over the power leads. Ensuring the actual operating polarity of the beamline is correctly recorded is a manual step and at risk of error or omission. We have deployed a simple system for monitoring the operating polarity of the two bending magnets by placing in each dipole bore a Honeywell LOHET-II Hall-effect sensor that operates past saturation at nominal field strengths, and thus return one of two well-defined voltages corresponding to the two possible polarities of the magnet. The environment in the experimental hall is monitored by an AKCP securityProbe 5E system integrated into our EPICS-based controls and monitoring system. We read out the beamline polarity sensors using a voltmeter module, and translate the output voltage into a polarity (or alarm) state within EPICS whence it can be accessed by the operators and stored in the output datastream. Initial test of the LOHET-II sensors indicates they will still be able to indicate beamline polarity after radiation doses of 600 Gy (Co60).
We'd like to thank Prof. Peter Hobson and Dr David Smith at Brunel University for performing the sensor irradiation

Poster TUPD90 [0.627 MB]

TUPD96

Fast and Critical Detection Devices Planned for the Machine Protection System at the Facility for Rare Isotope Beams

linac, status, EPICS, beam-losses

533

G. Kiupel, S. Assadi, T.D. Brown, P. Chu, J.L. Crisp, S. Peng, M.W. Stettler, Y. Zhang
FRIB, East Lansing, Michigan, USA

Funding: Work supported by US DOE Cooperative Agreement DE-SC0000661
The Facility for Rare Isotope Beams (FRIB) at Michigan State University (MSU) will use a 400 kW, heavy-ion cw linac to produce rare isotopes in support of a rich program of fundamental research. In the event of operational failures, the Machine Protection System (MPS) shuts off the beam within microseconds to control beam losses that may damage accelerator components. The operational mode is distributed to all fast and critical devices that have multiple hardware checkpoints and comparators. A relational database provides the framework for the development of the MPS management application. In this paper, we present the FRIB MPS architecture, plans and implementation.

WEOC03

Dark Current Monitor for the European XFEL

simulation, solenoid, impedance, FEL

572

D. Lipka, W. Kleen, J. Lund-Nielsen, D. Nölle, S. Vilcins, V. Vogel
DESY, Hamburg, Germany

Dark current is produced due from field emission in the accelerator. This generates a radiation background in the tunnel which damages the electronics and activates components. To decrease the dark current different methods like kickers and collimators are used. To control the dark current level and measure and optimize the efficiency of dark current reduction dark current monitors are required. To measure the dark current a cavity was designed and built with the operation frequency of the accelerator. Here the small charge of the dark current present in every RF bucket induces and superimposes a field up to a measurable level. The cavity is proven at the PITZ facility. In addition to dark current levels down to 50 nA, the monitor allows for charge measurements resolution below pC, better than the Faraday cup. In addition the ratio of amplitudes from higher order monopole modes is a function of the bunch length. Measurements show the same trend of bunch length compared with a destructive streak camera method with comparable resolution. Therefore this monitor is able to measure bunch charge, dark current and bunch length in a non-destructive manner.

Slides WEOC03 [0.935 MB]