Keyword: synchrotron
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MOPA04 The Beam Instruments for HIMM@IMP MMI, detector, extraction, cyclotron 33
 
  • T.C. Zhao, Y.C. Chen, J.M. Dong, Y.C. Feng, X.C. Kang, M. Li, S. Li, W.L. Li, W.N. Ma, R.S. Mao, H.H. Song, K. Song, Y. Wang, K. Wei, Z.G. Xu, Y. Yan, Y. Yin, Z.L. Zhao
    IMP/CAS, Lanzhou, People's Republic of China
 
  HIMM(Heavy Ion Medical Machine)is a synchrotron based accelerator for cancer therapy in Wuwei city, China. It is composed of 2 ion sources, LEBT, cyclotron, MEBT, a synchrotron, HEBT and therapy terminals. The commissioning of HIMM is completed .At present, electrical safety, electromagnetic compatibility and performance testing of medical devices have been passed, and now enters the clinical tests phase. The beam diagnositics(BD) devices for HIMM are designed and produced by IMP BD department .An overview of the integrated devices is presented, and the common beam parameters in the different parts of the accelerator facility are reviewed including intensity measurement, beam profile, emmitance, energy and so on with the related detectors such as the View Screen, Faraday Cup, Radial Detector, Multi-wires, Phase Probe, Wire Scanner, DCCT, ICT, BPM, Schottky, Slit, Beam Stopper, Beam Halo Monitor, Multi-channel Ionization Chamber. Additionally, the RF-KO for beam extraction, the strip foil with automatic control system as well as the detectors for terminal therapy are described.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA04  
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MOPB02 ARIES-ADA: An R&D Network for Advanced Diagnostics at Accelerators electron, diagnostics, emittance, laser 71
 
  • P. Forck, M. Sapinski
    GSI, Darmstadt, Germany
  • C. Gerth, K. Wittenburg
    DESY, Hamburg, Germany
  • U. Iriso, F. Pérez
    ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
  • R. Ischebeck
    PSI, Villigen PSI, Switzerland
  • O.R. Jones
    CERN, Geneva, Switzerland
 
  Funding: This project has received funding from the European Union's Horizon 2020 Research and Innovation programme under Grant Agreement No 730871.
Accelerator Research and Innovation for European Science and Society, ARIES, is an initiative funded by the European Union (https://aries.web.cern.ch/). The activity comprises three major categories: Joint Research Activities; Transnational Access; Network Activities. One of these networks is related to Advanced Diagnostics at Accelerators (ADA) with the task of strengthening collaborations between international laboratories for coordinated research and development in beam diagnostics (https://aries.web.cern.ch/content/wp8). This task is performed by organizing topical workshops on actual developments and supporting interchange of experts between different labs. Since the start of the project in May 2017 four topical workshops of two to three days duration have been organized, each with 30-40 participants ranging from novices to worldwide experts in their particular field. In this contribution these initial workshops are summarized and an outlook given for further workshops within this ARIES-ADA network.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPB02  
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MOPC03 Precise Measurement of Small Currents at the MLS electron, radiation, experiment, storage-ring 118
 
  • Y. Petenev, J. Feikes, J. Li, A.N. Matveenko, Y. Tamashevich
    HZB, Berlin, Germany
  • R. Klein, J. Lubeck, R. Thornagel
    PTB, Berlin, Germany
 
  The Physikalisch-Technische Bundesanstalt (PTB), the National Metrology Institute of Germany, utilizes an electron storage ring - the Metrology Light Source (MLS), located in Berlin, as a radiation source standard in the VIS, UV and VUV spectral range. In order to be able to calculate the absolute intensity of the radiation, the electron beam current has to be measured with low uncertainty. In this paper we focus on the measurement of the beam current in a range of several nA to 1 pA (one electron) by means of Si photodiodes, detecting synchrotron radiation from the beam. Electrons are gradually scraped out of the ring and the diode signal is analyzed afterwards. The exact number of stored electrons then can be derived from the signal. The measurement is carried out automatically with an in-house developed software.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPC03  
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MOPC19 Virtual Signal Spectrum Analyzer Development Based On RedPitaya and EPICS for Tune Measurement in BEPCII EPICS, controls, collider, interface 159
 
  • Y.H. Lu, J. He
    IHEP, Beijing, People's Republic of China
 
  An independent tune measurement system was developed in BEPCII with Direct Diode Detect (3D) technique. The system includes two diagonal electrode signals of a set of BPM, a self-developed board based on Direct Diode Detect (3D) technique, and a commercial virtual spectrum analyzer with a proprietary GUI client. Based on the open source digital electronics RedPitaya and open source software Spectrum, a device driver was developed based on EPICS and ASYN support for replacement of the commercial virtual spectrum analyzers and integration with the central system EPICS. According to the application requirements of tune measurement in BEPCII, the device driver finds the frequency point and power value corresponding to the X&Y tune between 631 to 800 kHz. The spectral resolution is 119 Hz. An EPICS IOC was built and run on RedPitaya for accessing the device driver. A CSS-based user interface shows the signal's power spectra and the tune frequency directly.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPC19  
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TUOB02 Optics Measurements in Storage Rings: Simultaneous 3-Dimensional Beam Excitation and Novel Harmonic Analysis optics, dipole, betatron, coupling 177
 
  • L. Malina, J.M. Coello de Portugal, J. Dilly, P.K. Skowroński, R. Tomás
    CERN, Geneva, Switzerland
 
  Optics measurements in storage rings employ turn-by-turn data of transversely excited beams. Chromatic parameters need measurements to be repeated at different beam energies, which is time-consuming. We present an optics measurement method based on adiabatic simultaneous 3-dimensional beam excitation, where no repetition at different energies is needed. In the LHC, the method has been successfully demonstrated utilising AC-dipoles combined with RF frequency modulation. It allows measuring the linear optics parameters and chromatic properties at the same time without resolution deterioration. We also present a new accurate harmonic analysis algorithm that exploits the noise cleaning based on singular value decomposition to compress the input data. In the LHC, this sped up harmonic analysis by a factor up to 300. These methods are becoming a "push the button" operational tool to measure the optics.  
slides icon Slides TUOB02 [1.117 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUOB02  
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TUOB04 A Vertical Phase Space Beam Position and Emittance Monitor for Synchrotron Radiation electron, experiment, detector, photon 186
 
  • N. Samadi
    University of Saskatchewan, Saskatoon, Canada
  • L.D. Chapman, L.O. Dallin
    CLS, Saskatoon, Saskatchewan, Canada
 
  We report on a system (ps-BPM) that can measure the electron source position and angular motion at a single location in a synchrotron bend magnet beamline using a combination of a monochromator and an absorber with a K-edge to which the monochromator was tuned in energy. The vertical distribution of the beam was visualized with an imaging detector where horizontally one part of the beam was with the absorber and the other part with no absorber. The small range of angles from the source onto the monochromator crystals creates an energy range that allows part of the beam to be below the K-edge and the other part above. Measurement of the beam vertical location without the absorber and edge vertical location with the absorber gives the source position and angle. Measurements were made to investigate the possibility of using the ps-BPM to correct experimental imaging data. We have introduced periodic electron beam motion using a correction coil in the storage ring lattice. The measured and predicted motions compared well for two different frequencies. We then show that measurement of the beam width and edge width gives information about the vertical electron source size and angular distribution.
[1] A phase-space beam position monitor for synchrotron radiation. J Synchrotron Radiat, 2015. 22(4): p. 946-55.
 
slides icon Slides TUOB04 [9.532 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUOB04  
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TUPA14 Beam Loss Monitoring in the ISIS Synchrotron Main Dipole Magnets dipole, detector, controls, radiation 236
 
  • D.M. Harryman, S.A. Fisher, W.A. Frank, B. Jones, A. Pertica, D.W. Posthuma de Boer, C.C. Wilcox
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
 
  Beam loss monitoring at the ISIS Neutron and Muon Source is primarily carried out with the use of gas ionisation chambers filled with argon. These chambers are 3 to 4m long and are positioned around the inside of the synchrotron as well as along the ISIS Linac and Extracted Proton Beamlines (EPBs). To achieve finer spatial resolution a programme has been implemented to install six scintillator Beam Loss Monitors (BLMs), each 300 mm long, inside each of the ten main dipole magnets. Using these scintillator BLMs the accelerator can be fine-tuned during set-up to reduce areas of beam loss that were previously unseen or hard to characterise. As the installation programme comes to an end, this paper will review: the installation of the scintillator BLMs, the electronic hardware and software used to control them, and the initial measurements that have been taken using them.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPA14  
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TUPB12 Machine Studies with Libera Instruments at the SLAC Spear3 Accelerators booster, brilliance, injection, feedback 284
 
  • S. Condamoor, W.J. Corbett, D.J. Martin, S. C. Wallters
    SLAC, Menlo Park, California, USA
  • M. Cargnelutti, P. Leban
    I-Tech, Solkan, Slovenia
  • L.W. Lai
    SSRF, Shanghai, People's Republic of China
  • Q. Lin
    Donghua University, Shanghai, People's Republic of China
 
  Turn-by-turn BPM readout electronics were tested on the SPEAR3 booster synchrotron and storage ring to identify possible improvements for the booster injection process and to characterize processor performance in the storage ring. For this purpose, Libera Spark and Libera Brilliance+ instruments were customized for the booster (358.4 MHz) and storage ring (476.3 MHz) radio-frequencies, respectively, and tested during machine studies. Even at low single-bunch booster beam current, the dynamic range of the Libera Spark readout electronics provided excellent transverse position measurement capability during the linac-to-booster injection process, the energy ramp-up phase and during beam extraction. Booster injection efficiency was also analyzed as a function of linac S-band bunch train arrival time. In the SPEAR3 storage ring turn-by-turn Libera Brilliance+ measurement capability was evaluated for single and multi-bunch fill patterns as a function of beam current. The single-turn measurement resolution was found to be better than 10 microns for a single 3 mA bunch. The horizontal single-bunch damping time was then determined with the 238 MHz bunch-by-bunch feedback system on and off.  
poster icon Poster TUPB12 [1.531 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPB12  
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TUPC01 Australian Synchrotron BPM Electronics Upgrade electron, brilliance, coupling, storage-ring 297
 
  • Y.E. Tan, R.B. Hogan
    AS - ANSTO, Clayton, Australia
 
  The storage ring at the Australian Synchrotron (AS) was originally equipped with 98 Libera Electrons. In late 2017 all 98 of the BPM electronics has been upgraded to Libera Brilliance+ and the old Libera Electrons have been moved to the injection system. The transition process and results from commissioning the new system will be presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPC01  
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TUPC09 Initial Results from the LHC Multi-Band Instability Monitor detector, operation, betatron, electron 314
 
  • T.E. Levens, T. Lefèvre, D. Valuch
    CERN, Geneva, Switzerland
 
  Intra-bunch transverse instabilities are routinely measured in the LHC using a "Head-Tail Monitor" based on sampling a wide-band BPM with a high-speed digitiser. However, these measurements are limited by the dynamic range and short record length possible with typical commercial oscilloscopes. This paper will present the initial results from the LHC Multi-Band Instability Monitor, a new technique developed to provide information on the beam stability with a high dynamic range using frequency domain analysis of the transverse beam spectrum.  
poster icon Poster TUPC09 [17.388 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPC09  
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WEPA18 Development of Longitudinal Beam Profile Diagnostics for Beam-beam Effects Study at VEPP-2000 electron, positron, collider, injection 410
 
  • M.V. Timoshenko, V.M. Borin, O.I. Meshkov, Yu. A. Rogovsky, D.B. Shwartz, Yu.M. Zharinov
    BINP SB RAS, Novosibirsk, Russia
  • V.L. Dorokhov
    BINP, Novosibirsk, Russia
 
  The comprehensive development of beam longitudinal profile measurement systems based on stroboscopic optical dissector has started at VEPP-2000 electron-positron collider complex. The dissector was setted and commissioned at booster ring BEP that was deeply upgraded (2013-2015) to achieve top energy of 1 GeV. Bunch lengthening with current was studied at BEP with its new RF-cavity. In addition the method of synchrotron frequency measurement by dissector was applied. After dissector checkouts at BEP the similar studies were carried out with a single beam at VEPP-2000 storage ring in parallel with streak-camera measurements. Good agreement of results was observed. Series of single-turn longitudinal and vertical bunch profiles snapshots was made by streak-camera with respect to delay after counter beam injection. The unexpected longitudinal beam dynamics was observed for intensities above the beam-beam threshold. These studies together with beam-beam coherent oscillations spectra seen by pickups are of a great interest for understanding of flip-flop phenomenon which establish a fundamental luminosity limit at VEPP-2000 operating with round beams.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPA18  
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WEPC02 Synchrotron Emittance Analysis Procedure at MedAustron emittance, MMI, betatron, simulation 490
 
  • L. Adler, A. De Franco, F. Farinon, N. Gambino, G. Guidoboni, C. Kurfürst, S. Myalski, M.T.F. Pivi, C. Schmitzer, I. Strašík, A. Wastl
    EBG MedAustron, Wr. Neustadt, Austria
 
  MedAustron is a synchrotron based medical accelerator facility for particle therapy providing protons and carbon ions with clinical energies from 60 MeV to 250 MeV and 120 MeV/n to 400 MeV/n respectively. The facility features four irradiation rooms, three of which are dedicated to clinical operation and a fourth one to non-clinical research. Commissioning of all fixed lines has been completed for protons, while the commissioning for carbon ions and a proton gantry is ongoing. For the commissioning of carbon ions, precise measurements of the transverse beam emittance in the synchrotron are of importance, to minimize beam losses and to correct for possible emittance variations due to the different clinically relevant beam intensities defined by a degrader at the end of the Linac. The transverse beam emittance in the MedAustron synchrotron is measured via scraping at non-dispersive regions of the ring. The analysis procedure as well as emittance reconstruction accuracy for simulated data will be described in this paper, together with measurement results from the carbon commissioning.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPC02  
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WEPC19 Selection of Wires for the New Generation of Fast Wire Scanners at CERN acceleration, proton, brightness, ECR 523
 
  • A. Mariet, R. Veness
    CERN, Geneva, Switzerland
 
  A new generation of fast wire scanners is being produced as part of the LHC Injector Upgrade (LIU) project at CERN. The LIU beam parameters imply that these wire scanners will need to operate with significantly brighter beams. This requires wires scanner systems with micron level accuracy and wires with a considerably increased tolerance to beam damage. This paper presents the method of selection of such wires in terms of material choice and geometry. It also reports on studies with novel materials with a potential to further extend the reach of wire scanners for high brightness beams.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPC19  
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THOB02 Energy Loss Measurements with Streak Camera at ALBA injection, storage-ring, simulation, insertion 548
 
  • A.A. Nosych, B. Bravo, U. Iriso
    ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
 
  Analyzing streak camera images of the beam injected into a Storage Ring with no RF voltage allows calculating several parameters, like the energy loss per turn and the energy mismatch between injected and stored beams. These measurements are based on the analysis of the centroid drift path of a bunch as it spirals inwards, changing its rotation period. This drift is clear and measurable in single and multi-bunch modes in several horizontal sweep speeds of the streak. With this technique we also measure the momentum compaction factor and observe its change with respect to the insertion devices' open/closed states. The obtained values are comparable with theoretical expectations, as well as with values measured by other means.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-THOB02  
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