Keyword: pick-up
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MOPAB035 Status of Beam Diagnostics for SIS100 ion, diagnostics, instrumentation, beam-diagnostic 156
 
  • M. Schwickert, O. Chorniy, T. Giacomini, P. Kowina, H. Reeg, T. Reichert, R. Singh
    GSI, Darmstadt, Germany
  
  The FAIR (Facility for Antiproton and Ion Research) accelerator facility presently under construction at GSI will supply a wide range of ion species and beam intensities for physics experiments. Design beam intensities range from 2.5·1013 protons/cycle to be delivered to the pBar-target and separator for production of antiprotons, to beams of e.g. 109 ions/s in the case of slowly extracted beams. The main synchrotron of FAIR is the fast ramped super-conducting SIS100. In the present layout SIS100 will deliver up to 4·1011 U-28+ ions/s with energies of 400-2700 MeV/u, either in single bunches of 30-90 ns, or as slowly extracted beam with extraction times of several seconds, for the radioactive ion beam program of FAIR. This contribution gives an overview of the present layout of beam diagnostic instruments for SIS100 and presents the status of the main development projects regarding e.g. the beam position monitor system, ionization profile monitor and the beam current transformers.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB035  
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MOPAB071 A Beam Position Monitor for the Diagnostic Line in MEBT2 of J-PARC Linac diagnostics, linac, impedance, operation 281
 
  • A. Miura, Y. Kawane, J. Tamura
    JAEA/J-PARC, Tokai-mura, Japan
  • T. Miyao
    KEK, Ibaraki, Japan
  
  In the linac of the Japan Proton Accelerator Research Complex (J-PARC), the neutral hydrogen (H0) generation from the negative hydrogen ion (H−) beam is one of key issues to mitigate the beam loss. In order to diagnose the H0 particles, we installed the bump magnets to make a chicane orbit of the H− beam. To evaluate the horizontal shifts of the beam orbit, a beam position monitor (BPM) is fabricated. The BPM measures the shift-positions with various driving currents of the bump magnets. We employed the WSM to measure the H− beam profile. It also help us to compare the shift-positions measured by BPM. In this paper, the design and the performance of the BPM is described. In addition, we describe how to compare the shift position.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB071  
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MOPAB088 A Differential Beam Intensity Monitoring for the CIADS LINAC monitoring, linac, simulation, instrumentation 325
 
  • Z.P. Xie
    Hohai University, Nanjing, People's Republic of China
  • Y. He, R. Huang, Z.J. Wang
    IMP/CAS, Lanzhou, People's Republic of China
  
  Funding: Work supported by the National Natural Science Foundation of China (Grant No. 91026001) and the Fundamental Research Funds for the Chinese Central Universities
The high power Linac places many crucial requirements on the beam diagnostics for the China initiative accelerator driven subcritical(CIADS) facility. Measuring the beam loss is essential for the purpose of machine protections for the facility. A beam position pickup based differential beam current monitoring (BPDBCM) scheme has been proposed for the MEBT section at CIADS. Discussions of the principles for the scheme and the realtionship between beam intensity measurement and the pulse length are presented. Simulations are performed and they demonstrate that the proposed system can be effective at the low enery section for the CIADS beam. This paper describes the proposed implementation that will have the capability of detecting both the instantaneous and chronicle loss in real time. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB088  
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MOPAB092 Design and Performance of Digital BPM Processor for DCLS and SXFEL FPGA, cavity, controls, electronics 338
 
  • L.W. Lai, F.Z. Chen, Y.B. Leng, Y.B. Yan, N. Zhang
    SSRF, Shanghai, People's Republic of China
  • J. Chen
    SINAP, Shanghai, People's Republic of China
  
  Funding: Work supported by National Natural Science Foundation (No. 11305253, 11575282)
A digital BPM processor has been developed in SINAP, which can be used on the signal processing of both stripline BPM and cavity BPM. The processor is a standalone system and providing 4 channels 120MS/s, 16 bits ADC and powerful Virtex-5 FPGA. The processor has been mas applied on Dalian Coherent Light Source and Shanghai X-ray FE. The processor specification and performance evaluations including lab and beam tests will be introduced. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB092  
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MOPAB093 Bunch Phase Measurement for Storage Ring storage-ring, simulation, injection, experiment 341
 
  • Y.M. Zhou, Y.B. Leng, N. Zhang
    SSRF, Shanghai, People's Republic of China
  • H.J. Chen
    SINAP, Shanghai, People's Republic of China
  
  A bunch-by-bunch phase measurement system has been studied to improve the accuracy of phase measurement. Longitudinal phase information will be retrieved from beam signals picked up from the button electrodes. The signals from four electrodes in the BPM are summed by using a 4-way power driver, by which the effect of the transverse beam offset on the phase measurement can be eliminated. Four samples with fixed time interval (typical 100ps) for each bunch, which are taken by a 500MHz waveform recorder with a four channels signal splitting and delaying network, will be used to calculate bunch phase. In this paper, we present the layout of the system and primary experimental results.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB093  
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MOPAB094 A Fast Beam Size Diagnostic System Using High-Speed Photomultiplier Array at SSRF diagnostics, detector, storage-ring, synchrotron 345
 
  • H.J. Chen, N. Zhang
    SSRF, Shanghai, People's Republic of China
  • J. Chen, B. Gao, L.W. Lai, Y.B. Leng
    SINAP, Shanghai, People's Republic of China
  
  A fast beam size diagnostic system is developing at SSRF (Shanghai Synchrotron Radiation Facility) storage ring for turn-by-turn and bunch-by-bunch beam trans-verse oscillation study and fast transverse feedback sys-tem improvement. The system is based on visible synchrotron radiation diagnostic, detected by a Hamamatsu H10515B 16-channel photomultiplier array with 0.6ns rise time. A telescope imaging system is also developing for optical front-end process, with simulation optical path calibra-tion and high-resolution CCD camera reference. A fast pick-up board and amplifiers are designed for analogue signal optimization. The data acquisition and analyse solution is Tektronix oscilloscope with 6GHz analogue bandwidth and 25GS/s sampling rate or four synchronized ADQ14 digitizers with 700MHz analogue bandwidth and 1GS/s sampling rate. By now, we have finished the detector selection, sys-tem setup, data acquisition design and system response testing. The telescope imaging testing and 16-channels data acquisition based on synchronized ADQ14s are under development. A new photomultiplier array with less response time is in plan for strictly bunch-by-bunch diagnostic.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB094  
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MOPAB100 The Development of Button Type BPM Electronics for RAON electronics, ion, operation, FPGA 362
 
  • S.W. Jang, E.-S. Kim, Y. Lee
    Korea University Sejong Campus, Sejong, Republic of Korea
  • Y.S. Chung, G.D. Kim, H.J. Woo
    IBS, Daejeon, Republic of Korea
  • J.W. Kwon
    Korea University, Seoul, Republic of Korea
  
  RAON is a heavy ion accelerator for the Rare Isotope Science Project in Korea. The main goals of RAON is to accelerate various stable ions from ECR ion source and rare isotopes ions from ISOL beam line. For the stable beam operation, the beam diagnostics equipment is very important. Recently, we developed a digital board electronics for the button type beam position monitor (BPM) to measure the position of ion beams. In this presentation, design of electronics, beam signal simulation results, and RF measurement test results with a developed button BPM will be described.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB100  
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MOPAB112 Schottky Based Intensity Measurements and Errors Due to Statistical Fluctuations background, antiproton, instrumentation, diagnostics 385
 
  • C. Carli, M.E. Angoletta, F. Caspers, O.R. Jones, F. Pedersen, J. Sanchez-Quesada, L. Søby
    CERN, Geneva, Switzerland
  
  The beam intensities at the Extra Low ENergy Antiproton ring ELENA are too low for standard beam current transformers and, thus, are measured with longitudinal Schottky diagnostics. This method is already successfully used at the Antiproton Decelerator since the commissioning of this machine. The fact that Schottky noise is a statistical phenomenon implies statistical errors of these measurements. Simple analytical formulas describing the statistical error to be expected as a function of the frequency spread of the band considered, the time resolution chosen and the background noise have been derived. On the one hand, low revolution harmonics and, in turn, frequency spread of the band analysed lead to large measurement errors as this situation corresponds to low momentum resolution of the resulting distribution describing the beam. At very large revolution harmonics and, thus, frequency spreads of the band analysed, the measurement error increases again due to additional contributions from the background noise.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB112  
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MOPAB113 Usage of the Transverse Damper Observation Box for High Sampling Rate Transverse Position Data in the LHC injection, diagnostics, impedance, operation 389
 
  • L.R. Carver, X. Buffat, A.C. Butterworth, W. Höfle, G. Iadarola, G. Kotzian, K.S.B. Li, E. Métral, M. Ojeda Sandonís, M.E. Söderén, D. Valuch
    CERN, Geneva, Switzerland
  
  The transverse damper observation box (ADTObsBox) is a device that makes accessible the bunch-by-bunch turn-by-turn data recorded from the pickups of the LHC transverse damper. This device can provide online transient analysis of different beam dynamics effects (tunes and damping times at injection, for example), while also under development is an online coherent instability triggering system. This paper will provide an overview of the current setup and plans for future upgrades, as well as detailing how it deals with the large volume of data being generated. The results of some analysis that rely on the ADTObsBox will also be shown.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB113  
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MOPAB117 Online Bunch by Bunch Transverse Instability Detection in LHC operation, network, feedback, injection 397
 
  • M.E. Söderén, G. Kotzian, M. Ojeda Sandonís, D. Valuch
    CERN, Geneva, Switzerland
  
  Reliable detection of developing transverse instabilities in the Large Hadron Collider is one of the main operational challenges of the LHC's high intensity proton run. A full machine snapshot provided from the moment of instability is a crucial input to develop and fine tune instability models. The transverse feedback system (ADT) is the only instrument in LHC, where a full rate bunch by bunch transverse position information is available. Together with a sub-micron resolution it makes it a perfect place to detect transverse beam motion. Very large amounts of data, at very high data rates (8 Gb/s) need to be processed on the fly to detect onset of transverse instability. A very powerful computer system (so called ADTObsBox) was developed and put into operation by the CERN RF group, which is capable of processing the full rate data streams from ADT and perform an on the fly instability detection. The output of this system is a timing event with a list of all bunches developing instability, which is then sent to the LHC-wide instability trigger network to freeze other observation instruments. The device also provides buffers with raw position data for offline analysis.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB117  
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MOPAB124 A Fast Gain Calibration Algorithm for Beam Position Monitoring at Taiwan Photon Source storage-ring, electron, operation, target 419
 
  • J.Y. Chen, C.H. Chen, M.-S. Chiu, P.C. Chiu, P.J. Chou, S. Fann, K.H. Hu, C.S. Huang, C.-C. Kuo, T.Y. Lee, C.C. Liang, Y.-C. Liu, G.-H. Luo, H.-J. Tsai, F.H. Tseng
    NSRRC, Hsinchu, Taiwan
  
  A stable, reliable and well-calibrated beam position monitor (BPM) system is essential for the operation of accelerators. At newly constructed Taiwan Photon Source (TPS), it not only helps us to determine the accelerator parameters, such as Twiss parameters and tune, but also to avoid the damage on accelerator instruments caused by high-energy particle beams or radiation. In this study, we demonstrate a new BPM calibration scheme at TPS storage ring. To excite the electron beams inside accelerator beam pipe by one horizontal or vertical corrector magnet, we measure the response of analog-to-digital converter (ADC) of each BPM pick-up electrodes with different lateral positions and beam currents. Depending on the measured ADC responses, we calibrated the beam position monitor system. Simultaneously, because of limited preparation time after every long shutdown, we are looking for a fast algorithm to ensure the measurement could be done easily and finished as quickly as possible.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB124  
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MOPVA017 Electrostatic Pickup in the CNAO Injection Line ion, linac, detector, proton 884
 
  • A. Parravicini, G.M.A. Calvi, E. Rojatti, C. Viviani
    CNAO Foundation, Pavia, Italy
  
  The paper concerns the electrostatic pickup (PUB) installed in the injection line of the CNAO, the Italian facility for Oncological Hadrontherapy. The PUB has been designed with the purpose of having a continuous and non-interceptive measurement of the beam transverse position short upstream the injection in the synchrotron. Detector commissioning has not been immediate since a number of primary ions and secondary electrons fall on the PUB electrodes in many configurations, resulting in a significantly distorted signal. After the identification, and consequent rejection, of a few circumstances where the PUB cannot work properly, the commissioning proceeded on a twofold way, designing a mechanical shield to stop ions before hitting the electrodes and developing an advanced data-analysis algorithm to go beyond the signal distortion. The use of the new algorithm was sufficient to make the PUB successfully working and, after a proper calibration with upstream and downstream profile monitors, the PUB started to provide the expected results. The PUB is working as a watch-dog since January 2016. Details on the data-analysis algorithm and first year measurements are discussed in the paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPVA017  
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MOPVA044 Conditioning of the Power Couplers for the ESS Elliptical Cavity Prototypes coupling, vacuum, cavity, controls 957
 
  • C. Arcambal, P. Carbonnier, M. Desmons, G. Devanz, T. Hamelin, C. Marchand, C. Servouin
    CEA/DRF/IRFU, Gif-sur-Yvette, France
  • C. Darve
    ESS, Lund, Sweden
  
  In the framework of the European Spallation Source (ESS), some power couplers have been designed and manufactured to supply, with RF power, the medium-beta (β=0.67) elliptical cavities of the cryomodule demonstrator. The power couplers work at 704.4 MHz and are tested up to 1.2 MW (repetition rate=14 Hz, RF pulse width close to 3.6 milliseconds). The CEA Saclay is in charge of the design, the manufacturing, the preparation and the conditioning of these power couplers. In this paper, after a general presentation of the power couplers used in the ESS LINAC and their characteristics, we give some détails about the manufacturing and then we describe the different steps of the preparation (cleaning), the assembly of the couplers on the coupling box in cleanroom, the baking of the couplers and the conditioning procedure. Finally, the experimental results obtained in travelling and standing waves on the first pairs of couplers will be shown.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPVA044  
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MOPVA113 RF Quality Control of SRF Cavities for LCLS-II Cryo-Modules HOM, cavity, controls, cryomodule 1108
 
  • M.H. Awida, P. Berrutti, T.N. Khabiboulline, A. Lunin, V.P. Yakovlev
    Fermilab, Batavia, Illinois, USA
  
  Funding: *Operated by Fermi Research Alliance, LLC, under Contract DE-AC02-07CH11359 with the U.S. DOE
LCLS-II project is gearing up to build 36 cryo-modules of the 1.3 GHz TESLA style cavities. Half of those cryomodules are being built at Fermilab, while JLAB is carrying the production of the other half. In this paper, we present the process of quality controlling the RF performance of cavities until they are qualified for the final string assembly at Fermilab. The RF quality control process includes monitoring the frequency spectrum of each cavity and tuning/adjusting of the notch frequencies before testing at the Vertical Test Stand (VTS). Measured data during income QC is presented and in addition we show the notch frequencies before and after testing at the VTS. Moreover, we report some of the RF measurements taken while the cavity is cooled down to 2K temperature. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPVA113  
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MOPVA117 Performance of a SRF Half-Wave-Resonator Tested at Cornell for the RAON Project cavity, radiation, simulation, SRF 1123
 
  • M. Ge, F. Furuta, T. Gruber, D.L. Hall, S.W. Hartman, C. Henderson, M. Liepe, S. Lok, T.I. O'Connell, P.J. Pamel, J. Sears, V. Veshcherevich
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  • B.H. Choi, J. Joo, J.W. Kim, W.K. Kim, J. Lee, I. Shin
    IBS, Daejeon, Republic of Korea
  
  A prototype half-wave-resonator (HWR) with frequency 162.5MHz and geometrical \beta=0.12 for the RAON project is currently undergoing testing at Cornell University. Detailed vertical performance testing includes (1) test of the bare cavity without the helium tank; (2) test of the dressed cavity with helium tank. In this paper, we report on the development of the test infrastructure, test results, and performance data analysis.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPVA117  
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TUPIK091 Simulation Tools for the Design and Performance Evaluation of Transverse Feedback Systems feedback, framework, simulation, interface 1912
 
  • J. Komppula, W. Höfle, K.S.B. Li
    CERN, Geneva, Switzerland
  
  Transverse feedback systems are used in synchrotrons and storage rings to damp injection oscillations and suppress transverse instabilities. Especially instabilities driven by high intensity beams in future circular colliders such as the FCC set challenging requirements for transverse feedback systems. In order to develop a transverse feedback system able to meet those requirements, sophisticated simulation tools are required. For this purpose, a new modular framework for modeling a transverse feedback system has been developed in Python. The framework can be used as a transverse feedback module in the macro-particle beam dynamics simulation code PyHEADTAIL or as a separate tool for studying a feedback model from a control theory point of view by using a simple signal models for the beam. The main principle of the code is presented and simulation methods used for the conceptual design of the FCC are discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK091  
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TUPIK093 Sensitivity of the LHC Transverse Feedback System to Intra-Bunch Motion feedback, simulation, hardware, impedance 1916
 
  • G. Kotzian, W. Höfle, D. Valuch
    CERN, Geneva, Switzerland
  
  The LHC Transverse Feedback System is designed to damp and counteract all possible coupled bunch modes between the lowest betatron frequency and 20 MHz. The present study reveals that the analogue frontend processing scheme based on down converting the pick-up signal at the LHC RF frequency to baseband considerably extends the detected bunch movements visible to the feedback system to beyond 1 GHz. We develop an analytical model of the signal processing chain to explore the impact of even-symmetric and odd-symmetric intra-bunch movements on the detected beam position as a function of the longitudinal bunch shape. A set of equations is derived suitable for numerical simulations, or as a complement in particle tracking codes to further refine the behaviour of the LHC transverse feedback system.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK093  
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TUPIK094 Transverse Feedback Parameter Extraction from Excitation Data feedback, kicker, damping, operation 1920
 
  • G. Kotzian
    CERN, Geneva, Switzerland
  
  In this paper we present a simple and fast approach to extract essential parameters of a transverse feedback system such as phase advances between pick-ups and kickers, fractional tune, kicker delay, or per-bunch transverse activity from discrete-time samples of position signals. In this approach the beam is excited and subsequent beam oscillations are recorded. Given that any number of pick-ups can be evaluated at once with only a marginal increase of transverse beam size this method is suitable for regular health checks of a transverse feedback system, e.g., for every injection. The fundamental idea relies on the reconstruction of the transverse phase space by means of digital filters. We sketch a simple mathematical model to illustrate the underlying method. Examples are given together with a set of filter kernels for the fractional tunes of the LHC transverse feedback system.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK094  
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TUPIK095 Possibilities for Transverse Feedback Phase Adjustment by Means of Digital Filters feedback, kicker, betatron, damping 1924
 
  • G. Kotzian
    CERN, Geneva, Switzerland
  
  In transverse feedback systems a phase adjustment is generally required to convert a beam position signal from a pick-up into a momentum correction signal used by a transverse kicker. In this paper we outline several possibilities for phase adjustments using only single pick-ups or the vector combination of two pick-ups. Analytical expressions are given as a function of the fractional tune and the betatron phase advance between the pick-up location and the kicker. The shortest possible digital filter is formulated, including a notch for closed orbit suppression and a free parameter to adjust for betatron phase. We introduce a novel, fully parametrized digital filter with the feature to be insensitive to variations in fractional tune. Examples are given for the SPS transverse feedback system and compared with measurements.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK095  
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TUPVA008 Assessment of Thermal Loads in the CERN SPS Crab Cavities Cryomodule cavity, cryomodule, HOM, radiation 2047
 
  • F. Carra, J. Apeland, R. Calaga, O. Capatina, T. Capelli, C. Zanoni
    CERN, Geneva, Switzerland
  • S. Verdú-Andrés
    BNL, Upton, Long Island, New York, USA
  
  Funding: *Work supported by the European Union HL-LHC Project and by US DOE through Brookhaven Science Associates LLC under contract No. DE-AC02-98CH10886 and the US LHC Accelerator Research Program (LARP). Research supported by the HL-LHC project.
As a part of the HL-LHC upgrade, a cryomodule is designed to host two crab cavities for a first test with protons in the SPS machine. The evaluation of the cryomodule heat loads is essential to dimension the cryogenic infrastructure of the system. The current design features two cryogenic circuits. The first circuit adopts superfluid helium at 2 K to maintain the cavities in the superconducting state. The second circuit, based on helium gas at a temperature between 50 K and 70 K, is connected to the thermal screen, also serving as heat intercept for all the interfaces between the cold mass and the external environment. An overview of the heat loads to both circuits, and the combined numerical and analytical estimations, is presented. The heat load of each element is detailed for the static and dynamic scenarios, with considerations on the design choices for the thermal optimization of the most critical components.
#Federico.carra@cern.ch 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA008  
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TUPVA080 Stochastic Cooling Hardware for Low Energy Deuterons at COSY kicker, impedance, experiment, electron 2261
 
  • B. Breitkreutz, R. Greven, N. Shurkhno, R. Stassen, H. Stockhorst
    FZJ, Jülich, Germany
  
  One of the central utilizations of the COSY facility nowadays is to host experiments for the JEDI (Jülich Electric Dipole moment Investigations) collaboration. These experiments use polarized deuteron beams at momenta below 1 GeV/c, that are stored for several minutes. In order to increase the spin coherence time, beam cooling is necessary. Electron cooling is applied to pre-cool the beam, but the solenoids of the electron cooler may not be perfectly compensated. Thus, stochastic cooling would be desirable instead. Unfortunately, the existing stochastic cooling system is not sensitive at low beam velocities. This paper presents newly developed stochastic cooling pickups and kickers for a system dedicated to low beam velocities of approximately 0.5c. The design is based on the slot-ring type pickups that have been developed for the High Energy Storage Ring (HESR), but optimized for low particle velocities and a low frequency band of 350-700 MHz. Since the structures get much bigger in comparison to the HESR version, mechanical properties must be reconsidered and a trade-off between electrical properties, cooling performance and constructability must be found.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA080  
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TUPVA085 First Experiences with HESR Stochastic Cooling System kicker, hardware, impedance, ion 2278
 
  • R. Stassen, B. Breitkreutz, T. Katayama, N. Shurkhno, H. Stockhorst
    FZJ, Jülich, Germany
  • T. Katayama
    Nihon University, Narashino, Chiba, Japan
  • L. Thorndahl
    CERN, Geneva, Switzerland
  
  The stochastic cooling system of the HESR (High Energy Storage Ring) is based on completely new structures especially designed for the HESR. Each beam surrounding slot of these so called slot-ring couplers covers the whole image current without a reduction of the HESR aperture and without any plunging system. One pickup and one kicker have been already fabricated and installed into the COSY ring to demonstrate stochastic cooling in all three dimensions with only one structure. First results of commissioning with proton beams will be presented. The longitudinal cooling system at HESR is based on filter cooling with an optical notch-filter and ToF cooling. The demanding accuracy concerning phase stability requires dedicated control of the notch-frequency. The optical COSY filter has been modified and can be proven in long term runs together with the new stochastic cooling system.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA085  
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THPIK005 RF Conditionning of the Spiral 2 CW RFQ rfq, cavity, controls, LLRF 4114
 
  • O. Piquet, Y. Lussignol
    CEA/DSM/IRFU, France
  • M. Desmons, A.C. France, P. Galdemard
    CEA/IRFU, Gif-sur-Yvette, France
  • M. Di Giacomo, R. Ferdinand, J.-M. Lagniel
    GANIL, Caen, France
  
  The SPIRAL2 RFQ is designed to accelerate light and heavy ions with A/Q from 1 to 3 at 0.73 MeV/A. The nominal beam intensities are up to 5 mA CW for both proton and deuteron beams and up to 1 mA CW for heavier ions. The four-vane cavity is made with 5 1-meter long sections mechanically assembled, it works at 88 MHz and is powered up to 180 kW CW to achieve the nominal vane voltage of 113.7 kV for A/Q = 3 ions. This paper describes the RF conditioning of the RFQ at GANIL with the setting of its RF systems and cooling system used to tune the cavity resonance frequency.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK005  
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THPIK030 THE RF CAVITY FOR THE SESAME FACILITY cavity, storage-ring, vacuum, controls 4158
 
  • C. P. Pasotti, M. Bocciai, M. Rinaldi
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  • D.S. Foudeh, E. Huttel
    SESAME, Allan, Jordan
  
  SESAME is a 2.5 GeV Synchrotron Light Source under commissioning in Allan (Jordan). It will be the first inter-national research centre in the Middle East [1]. It is a cooperative venture with support provided by several international organizations and scientific laboratories. Elettra-Sincrotrone Trieste (Italy) is among them. In the framework of the collaboration agreement among SESAME (Jordan), INFN (Italy) and Elettra-Sincrotrone Trieste, four 500 MHz normal conducting (NC) copper cavities have been built and commissioned at Elettra and then successfully installed in the SESAME storage ring. The cavities properties, their fabrication process, their characterization at low and high RF power is presented here.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK030  
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THPVA062 Fabrication and Tests of a RF Cavity for a Novel Compact Superconducting Cyclotron for Radioisotope Production cavity, cyclotron, vacuum, simulation 4585
 
  • D. Gavela, J. Calero, L. García-Tabarés, P. Gómez, D. López, D. Obradors-Campos, C. Oliver, J.M. Pérez Morales, I. Podadera, F. Toral
    CIEMAT, Madrid, Spain
  • B. Bravo, R. Fos, J.R. Ocampo, F. Pérez, A. Salom, P. Solans
    ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
  
  Funding: Work partially funded by CDTI and supported by the Spanish Ministry of Economy and Competitiveness, under project AMIT, within the subprogram CEN-20101014
The AMIT cyclotron will be a 8.5 MeV, 10 microAmp, CW, H− accelerator for radioisotope production, including a superconducting, weak focusing, 4 T magnet, allowing for a low extraction radius and a compact design. The cavity is a 60 MHz, quarter wave resonator powered by a modular 8 kW solid state amplifier. The design of the cavity dealed with challenging requirements: high electric fields required by a high voltage (60 kV) on a small gap, a small aperture of the magnet leading to high capacitances and thermal losses and a requirement for a low overall size of the cavity. The fabrication process included high precision machining, soft soldering, laser welding and careful metrologies, which are described together with other technical and practical aspects. The low power tests showed a good agreement with the simulations. The conditioning of the cavity was performed with a 1.1 T magnetic field applied on the central region. It was successfully finished regarding to maximum voltage reached, power losses and temperatures. The cavity was also tested at high power with a constant hydrogen flow injected in the central region (as expected in the cyclotron) with success. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA062  
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THPVA075 Beam Measurements in the MedAustron Synchrotron With Slow Extraction and Off-Momentum Operation emittance, synchrotron, extraction, betatron 4623
 
  • C. Kurfürst, A. De Franco, F. Farinon, M. Kronberger, S. Myalski, S. Nowak, F. Osmić, M.T.F. Pivi, C. Schmitzer, P. Urschütz, A. Wastl
    EBG MedAustron, Wr. Neustadt, Austria
  • A. Garonna
    TERA, Novara, Italy
  • T.K.D. Kulenkampff
    CERN, Geneva, Switzerland
  • L.C. Penescu
    Abstract Landscapes, Montpellier, France
  
  The MedAustron Ion Therapy Center is a medical accelerator facility for hadron therapy cancer treatment using protons and carbon ions. The facility features 4 irradiation rooms, three of which are dedicated to clinical operation and a fourth one dedicated to non-clinical research. The latter was handed over to researchers in autumn 2016. A 7 MeV/n injector feeds a 77 m circumference synchrotron which provides beams for treatment and research. Routine verification measurements in the synchrotron involve beam emittance, dispersion as well as tunes and chromaticity. The horizontal and vertical emittance are measured using scraping plates and a direct current transformer. The dispersion function in the ring is determined by sweeping the synchrotron RF frequency while measuring the beam position in the shoe-box pick-ups. The horizontal and vertical betatron tune and chromaticity are measured with Direct Diode Detection electronics, developed at CERN, while changing the beam position with the RF radial loop. The beam is kept off-momentum, thus in dispersive regions the closed orbit is largely offset from the central orbit. Methods for beam measurements in the synchrotron are presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA075  
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THPVA085 Design and Construction of 126 MHz Capacity Loaded Aluminium Cavity Prototype cavity, simulation, higher-order-mode, impedance 4653
 
  • S. Ahmadiannamin, J. Rahighi, Kh.S. Sarhadi
    ILSF, Tehran, Iran
  • F. Abbasi
    Shahid Beheshti University, Tehran, Iran
  • M. Lamehi Rashti
    IPM, Tehran, Iran
  
  Iranian light source Facility (ILSF)isa 3 GeV Ultra low emittance synchrotron with 528 meter circumference that will be constructed in the city of Qazvin, located 150km west of Tehran. Motivated by the development of HOM damped cavity with simpler structure at 100 MHz at MAX Lab and also lower costs, 100 MHz RF system is envisaged for ILSF booster and storage ring. An RF cavity prototype was fabricated for better understandingof characteristics of capacity loaded RF cavities by practical investigation. In this paper, design and development of this prototype is presentedwith the simulation and measurement results.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA085  
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