Keyword: proton
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WEPV012 Beam Fast Recovery Study and Application for CAFe operation, linac, status, controls 648
  • J.S. Li, Y.X. Chen, J. Wang, F. Yang, H. Zheng
    IMP/CAS, Lanzhou, People’s Republic of China
  Based on the MASAR (MAchine Snapshot, Archiving, and Retrieve) system, a beam fast recovery system was designed and tested in CAFe (Chinese ADS Front-end Demo Superconducting Linac) at IMP/CAS for high cur-rent CW (Continuous Wave) beam. The proton beam was accelerated to about 20 MeV with 23 SC (Superconduct-ing) cavities, and the maximum current reaches about 10 mA. The fast-recovery system plays a major role in the 100-hours-100-kW long-term test, during which the aver-age time of the beam recovery is 7 second, achieving the availability higher than 90%. The system verifies the possibility for high current beam fast recovery in CiADS (China initiative Accelerator Driven sub-critical System).  
poster icon Poster WEPV012 [0.469 MB]  
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About • Received ※ 10 October 2021       Revised ※ 22 October 2021       Accepted ※ 21 November 2021       Issue date ※ 02 March 2022
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WEPV037 Development of a Voltage Interlock System for Normal-Conducting Magnets in the Neutrino Experimental Facility at J-PARC experiment, power-supply, operation, controls 738
  • K. Nakayoshi, Y. Fujii, K. Sakashita
    KEK, Tsukuba, Japan
  We are upgrading a beamline of neutrino experimental facility at J-PARC to realize its 1.3MW operation. One of the upgrade items is to strengthen machine protection interlocks at the beamline. So far, we have developed an interlock system that monitors the output current of the power supplies for normal-conducting(NC) magnets at the primary beamline. On the other hand, we observed an event that a coil-short in one of bending magnets at a beam transport line at J-PARC (3-50BT) happened in 2019 and it caused a drift of beam orbit over the time. Our present interlock system can not detect a similar coil-short in the magnet while such change of the beam orbit may cause a serious trouble. One of possible way to detect such coil-short is to monitor a voltage of the magnet coil. Actually, a significant voltage drop between layers of the coil was observed for the 3-50BT magnet coil-short. Focusing on the fact, we are developing a system that constantly monitors the voltage value of the magnets at primary beamline and issues an interlock when there is a fluctuation exceeding a threshold value. We report the progress of development of the system.  
poster icon Poster WEPV037 [7.195 MB]  
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About • Received ※ 27 October 2021       Revised ※ 11 November 2021       Accepted ※ 21 November 2021       Issue date ※ 12 January 2022
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THPV029 Development of Timing Read-Back System for Stable Operation of J-PARC timing, operation, LLRF, controls 927
  • M. Yang
    Sokendai, Ibaraki, Japan
  • N. Kamikubota
    KEK, Ibaraki, Japan
  • N. Kikuzawa
    JAEA/J-PARC, Tokai-mura, Japan
  • K.C. Sato
    J-PARC, KEK & JAEA, Ibaraki-ken, Japan
  • Y. Tajima
    Kanto Information Service (KIS), Accelerator Group, Ibaraki, Japan
  Since 2006, the Japan Proton Accelerator Research Complex (J-PARC) timing system has been operated successfully. However, there were some unexpected trig-ger-failure events, typically missing trigger events, during the operation over 15 years. When a trigger-failure event occurred, it was often tough to find the one with the fault among many suspected modules. To solve the problem more easily, a unique device, triggered scaler, was devel-oped for reading back accelerator signals. The performance of the module has been evaluated in 2018. In 2021, we measured and observed an LLRF sig-nal as the first signal of the read-back system for beam operation. After firmware upgrades of the module, some customized timing read-back systems were developed, and successfully demonstrated as coping strategies for past trigger-failure events. In addition, a future plan to apply the read-back system to other facilities is discussed. More details are given in the paper.  
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About • Received ※ 20 October 2021       Accepted ※ 21 November 2021       Issue date ※ 13 January 2022  
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THPV037 The Implementation of the Beam Profile Application for KOMAC Beam Emittance EPICS, controls, linac, emittance 947
  • J.H. Kim, S.Y. Cho, S. Lee, Y.G. Song, S.P. Yun
    KOMAC, KAERI, Gyeongju, Republic of Korea
  Funding: This work was supported by the Ministry of Science, ICT & Future Planning of the Korean Government.
Korea Multi-purpose Accelerator Complex(KOMAC) has been operating a 100 MeV proton linear accelerator that accelerates a beam using ion source, a radio frequency quadrupole(RFQ), 11 drift tube linac(DTL). And the accelerated protons are transported to target rooms that meets the conditions required by the users. It is important to figure out the beam profile of the proton linac to provide the proper beam condition to users. We installed 8 wire scanners to measure beam emittance of KOMAC at beam lines. And beam profile application to measure beam emittance has been implemented using EPICS and python. This paper will describe the implementation of the beam profile application for KOMAC beam emittance.
poster icon Poster THPV037 [1.722 MB]  
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About • Received ※ 08 October 2021       Revised ※ 21 October 2021       Accepted ※ 21 November 2021       Issue date ※ 27 February 2022
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