Keyword: MMI
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MOOB01 Beam Commissioning of SuperKEKB Rings at Phase-2 operation, detector, feedback, injection 6
 
  • M. Tobiyama, M. Arinaga, J.W. Flanagan, H. Fukuma, H. Ikeda, H. Ishii, S.H. Iwabuchi, G.M. Mitsuka, K. Mori, M. Tejima
    KEK, Ibaraki, Japan
  • G. Bonvicini
    Wayne State University, Detroit, Michigan, USA
  • E. Mulyani
    Sokendai, Ibaraki, Japan
  • G.S. Varner
    University of Hawaii, Honolulu,, USA
 
  The Phase 2 commissioning of SuperKEKB rings with Belle II detector began in Feb. 2018. Staring the commissioning of positron damping ring (DR), the injection and storage of the main rings (HER and LER) smoothly continued in Apr., 2018. The first collision has been achieved on 26th Apr. with the detuned optics (200 mm x 8 mm). Performance of beam instrumentation systems and the difficulties encountered during commissioning time will be shown.  
slides icon Slides MOOB01 [11.232 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOOB01  
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MOPA02 Beam Diagnostics for SuperKEKB Damping Ring in Phase-II Operation injection, radiation, timing, operation 29
 
  • H. Ikeda, M. Arinaga, J.W. Flanagan, H. Fukuma, H. Ishii, S.H. Iwabuchi, G.M. Mitsuka, K. Mori, M. Tejima, M. Tobiyama
    KEK, Ibaraki, Japan
 
  The SuperKEKB damping ring (DR) commissioning started in February 2018, before main ring (MR) Phase-II operation. We constructed the DR in order to deliver a low-emittance positron beam. The design luminosity of SuperKEKB is 40 times that of KEKB with high current and low emittance. A turn-by- turn beam position monitor (BPM), transverse feedback system, synchrotron radiation monitor (SRM), DCCT, loss monitor using ion chambers, bunch current monitor and tune meter were installed for beam diagnostics at the DR. An overview of the instrumentation and status will be presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA02  
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MOPA04 The Beam Instruments for HIMM@IMP synchrotron, 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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MOPA13 Fast Luminosity Monitoring for the SuperKEKB Collider (LumiBelle2 Project) luminosity, detector, feedback, monitoring 51
 
  • C.G. Pang, P. Bambade, S. Di Carlo, D. Jehanno, V. Kubytskyi, Y. Peinaud, C. Rimbault
    LAL, Orsay, France
  • Y. Funakoshi, S. Uehara
    KEK, Ibaraki, Japan
 
  LumiBelle2 is a fast luminosity monitoring system prepared for SuperKEKB. It uses sCVD diamond detectors placed in both the electron and positron rings to measure the Bhabha scattering process at vanishing scattering angle. Two types of online luminosity signals are provided, a Train-Integrated-Luminosity at 1 kHz as input to the dithering feedback system used to maintain optimum overlap between the colliding beams in horizontal plane, and Bunch-Integrated-Luminosities at about 1 Hz to check for variations along the bunch trains. Individual beam sizes and offsets can also be determined from collision scanning. This paper will describe the design of LumiBelle2 and report on its performance during the Phase-2 commissioning of SuperKEKB.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA13  
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TUOA01 The Diagnostic System at the European XFEL; Commissioning and First User Operation FEL, diagnostics, operation, electron 162
 
  • D. Nölle
    DESY, Hamburg, Germany
 
  The European XFEL is now commissioned and user operation has started. Long bunch trains up to 300 bunches are established. The role of and experience with the beam diagnostic will be reported. Highlights, problems and their solutions will be discussed.  
slides icon Slides TUOA01 [8.932 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUOA01  
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TUPA17 Status of the BNL LEReC Machine Protection System gun, electron, laser, operation 249
 
  • S. Seletskiy, Z. Altinbas, D. Bruno, M.R. Costanzo, K.A. Drees, A.V. Fedotov, D.M. Gassner, X. Gu, L.R. Hammons, J. Hock, R.L. Hulsart, P. Inacker, J.P. Jamilkowski, D. Kayran, J. Kewisch, C. Liu, K. Mernick, T.A. Miller, M.G. Minty, M.C. Paniccia, W.E. Pekrul, I. Pinayev, V. Ptitsyn, V. Schoefer, L. Smart, K.S. Smith, R. Than, P. Thieberger, J.E. Tuozzolo, W. Xu, Z. Zhao
    BNL, Upton, Long Island, New York, USA
 
  The low energy RHIC Electron Cooler (LEReC) will be operating with 1.6-2.6 MeV electron beams having up to 140 kW power. It was determined that under the worst case scenario the missteered electron beam can damage the vacuum chamber and in-vacuum components within 40 us. Hence, the LEReC requires a dedicated fast machine protection system (MPS). The LEReC MPS has been designed and built and currently is under commissioning. In this paper we describe the most recent developments with the LEReC MPS.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPA17  
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TUPB01 The Installation and Commissioning of the AWAKE Stripline BPM electron, electronics, proton, TRIUMF 253
 
  • S. Liu, P.E. Dirksen, V.A. Verzilov
    TRIUMF, Vancouver, Canada
  • S.J. Gessner, F. Guillot-Vignot, D. Medina, L. Søby
    CERN, Geneva, Switzerland
 
  Funding: # TRIUMF contribution was supported by NSERC and CNRC
AWAKE (The Advanced Proton Driven Plasma Wakefield Acceleration Experiment at CERN) stripline BPMs are required to measure the position of the single electron bunch to a position resolution of less than 10 µm rms for electron charge of 100 pC to 1 nC. This paper describes the design, installation and commissioning of a such BPM system developed by TRIUMF (Canada). Total 12 BPMs and electronics had been installed on AWAKE beam lines and started commissioning since Fall of 2017. The calibration and measurement performance are also reviewed.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPB01  
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TUPB02 Complete Test Results of New BPM Electronics for the ESRF New LE-Ring electron, electronics, SRF, controls 257
 
  • K.B. Scheidt
    ESRF, Grenoble, France
 
  Among the 320 BPMs in the ESRF new low emittance ring, a set of 128 units will be equipped with new electronics, while the other set (192) will be served by the existing Libera-Brilliance electronics. These new electronics are an upgraded version of the low-cost Spark electronics originally developed 3 years ago for the ESRF Injector complex. All these 128 units have been installed in the first half of 2018 on existing BPM signals (through duplication with RF-splitters) and subsequently been tested thoroughly for performance characteristics like stability, resolution and reliability. It will be shown that while these Sparks have a very straightforward and simple concept, i.e. completely omitting calibration schemes like RF-cross-bar switching, pilot-tone introduction or active temperature control, that they are fully compatible with all the beam position measurement requirements of this new ring.  
poster icon Poster TUPB02 [1.577 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPB02  
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TUPC07 First Results of Button BPMs at FRIB electron, electronics, linac, pick-up 311
 
  • S. Cogan, J.L. Crisp, T.M. Ford, S.M. Lidia
    FRIB, East Lansing, USA
 
  Funding: This material is based upon work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661, the State of Michigan and Michigan State University.
Commissioning and tuning the linac driver for the Facility for Rare Isotope Beams (FRIB) requires a large network of warm and cryogenic BPMs, with apertures of 40 - 150 mm, sensitivity to beam currents of 100 nA to 1 mA, and accurate for beams with velocities as low as 0.03c. We present initial results of the BPM system, analog and digital signal processing, distortion and error correction, and calibration for time of flight (TOF) measurements. Measurements for low energy beams are presented.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPC07  
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TUPC13 Early Commissioning of the Luminosity Dither Feedback for SuperKEKB luminosity, feedback, controls, electron 328
 
  • M. Masuzawa, Y. Funakoshi, T. Kawamoto, S. Nakamura, T. Oki, M. Tobiyama, S. Uehara
    KEK, Ibaraki, Japan
  • P. Bambade, S. Di Carlo, D. Jehanno, C.G. Pang
    LAL, Orsay, France
  • D.G. Brown, A.S. Fisher, M.K. Sullivan
    SLAC, Menlo Park, California, USA
  • D. El Khechen
    CERN, Geneva, Switzerland
  • U. Wienands
    ANL, Argonne, Illinois, USA
 
  SuperKEKB is an electron-positron collider, which aims to achieve a peak luminosity of 8×1035 cm-2 s−1 using what is known as the "nano-beam" scheme. This paper reports on the commissioning and performance of a luminosity dither feedback. The system, based on one previously used at SLAC for PEP-II, is employed for collision orbit feedback in the horizontal plane. Twelve air-core Helmholtz coils drive the positron beam sinusoidally at a frequency near 80 Hz, forming a closed bump at the interaction point. A lock-in amplifier detects the amplitude and phase of the corresponding frequency component of the luminosity signal. When the beams are aligned for peak luminosity, the magnitude of the luminosity component at the dithering frequency becomes zero. The magnitude grows as the beams are offset, and the phase shifts by 180 degrees when the direction of the necessary correction reverses. The hardware and algorithm were tested during SuperKEKB Phase II run. The electron beam orbit was successfully adjusted to minimize the amplitude of the dither frequency component of the luminosity signal, and the optimal condition was maintained by continuously adjusting the electron beam orbit.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPC13  
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WEOC02 Review of Recent Status of Coded Aperture X-ray Monitors for Beam Size Measurement detector, optics, emittance, electron 361
 
  • J.W. Flanagan
    KEK, Ibaraki, Japan
 
  Funding: US-Japan Cooperation in High Energy Physics (Japan Monbukagakusho and US DOE). Kakenhi.
X-ray beam profile monitors based on coded aperture imaging use an array of pinholes or slits to achieve large open apertures, which provide improved photon collection efficiency over single pinholes or slits. The resulting improvement in photon statistics makes possible single-bunch, single-turn measurements at lower bunch currents than are possible with a single pinhole or slit. In addition, the coded aperture pattern provides extra information for beam profile reconstruction, which makes possible somewhat improved resolution, as compared to a single slit. The reconstruction algorithm for coded aperture imaging is more complicated and computing-intensive than that for a single slit, though with certain classes of coded pertures a faster reconstruction method is possible. This talk will provide a survey of efforts to use coded aperture imaging for beam profile diagnostics at accelerators to date, covering principles and practical experiences with the technique, as well as prospects for the future at SuperKEKB, where it forms the primary means of measuring vertical beam sizes.
 
slides icon Slides WEOC02 [4.065 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEOC02  
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WEPA07 Beam Phase Measurement System in CSNS Linac linac, DTL, electron, electronics 386
 
  • P. Li
    IHEP CSNS, Dongguan, People's Republic of China
  • F. Li, T.G. Xu
    IHEP, Beijing, People's Republic of China
  • M. Meng
    DNSC, Dongguan, People's Republic of China
  • J. Peng
    CSNS, Guangdong Province, People's Republic of China
  • W. Peng
    CETC, Shushan, People's Republic of China
 
  We developed beam phase measurement system ourselves in CSNS (China Spallation Neutron Source). The resolution of the system is less than 0.1° and the accuracy is less than 1°. It played a key role in CSNS Linac commissioning especially in RFQ and DTL commissioning. Further we measured the beam energy by TOF (Time of Flight) method base on this system. The energy accuracy is less than 0.1 MeV.  
poster icon Poster WEPA07 [1.070 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPA07  
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WEPA19 Results from the CERN LINAC4 Longitudinal Bunch Shape Monitor linac, cavity, electron, emittance 415
 
  • J. Tan, G. Bellodi
    CERN, Geneva, Switzerland
  • A. Feschenko, S.A. Gavrilov
    RAS/INR, Moscow, Russia
 
  The CERN Linac4 has been successfully commissioned to its nominal energy and will provide 160 MeV H ions for charge-exchange injection into the Proton Synchrotron Booster (PSB) from 2020. A complete set of beam diagnostic devices has been installed along the accelerating structures and the transfer line for safe and efficient operation. This includes two longitudinal Bunch Shape Monitors (BSM) developed by the Institute for Nuclear Research (INR, Moscow). Setting-up the RF cavities of Linac4 involves beam loading observations, time-of-flight measurements and reconstruction of the longitudinal emittance from phase profile measurements. In this paper the BSM is presented along with some results obtained during accelerator commissioning, including a comparison with phase measurements performed using the Beam Position Monitor system.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPA19  
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WEPA20 First Results From the Bunch Arrival-Time Monitors at SwissFEL laser, FEL, pick-up, electron 420
 
  • V.R. Arsov, P. Chevtsov, S. Hunziker, M.G. Kaiser, D. Llorente Sancho, A. Romann, V. Schlott, M. Stadler, D.M. Treyer
    PSI, Villigen PSI, Switzerland
  • M. Dach
    Dach Consulting GmbH, Brugg, Switzerland
 
  Two Bunch Arrival-Time Monitors (BAM), based on fiber optical Mach-Zehnder intensity modulators, which encode the arrival-time information in the amplitude of the laser pulses delivered through a highly stable pulsed optical reference distribution system, have been commissioned and are operational at SwissFEL. The first BAM is at the RF-Gun, the second one is downstream the first bunch compressor. Both BAMs operate simultaneously and measure the arrival-time drift and jitter with less than 5 fs resolution. For the first time we have experimentally verified the excellent SwissFEL bunch stability. We have developed concepts and tested hardware, which enhance the commissioning and user operation. In particular we have successfully tested a tool for fast timing overlap between the electron bunch and the reference laser pulse, which allows fast system set-up and characterization. We have verified the capability for 2-bunch and 100 Hz operation. In comparison to the prototype detectors, which were operational at the SwissFEL test injector, we have achieved an improved BAM resolution in the range 10 pC - 200 pC.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPA20  
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WEPC02 Synchrotron Emittance Analysis Procedure at MedAustron emittance, synchrotron, 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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