Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Beam position measurement system at HIRFL-CSRm

  • Min Li (Institute of Modern Physics, Chinese Academy of Sciences) ;
  • Guoqing Xiao (Institute of Modern Physics, Chinese Academy of Sciences) ;
  • Ruishi Mao (Institute of Modern Physics, Chinese Academy of Sciences) ;
  • Tiecheng Zhao (Institute of Modern Physics, Chinese Academy of Sciences) ;
  • Youjin Yuan (Institute of Modern Physics, Chinese Academy of Sciences) ;
  • Weilong Li (Institute of Modern Physics, Chinese Academy of Sciences) ;
  • Kai Zhou (Institute of Modern Physics, Chinese Academy of Sciences) ;
  • Xincai Kang (Institute of Modern Physics, Chinese Academy of Sciences) ;
  • Peng Li (Institute of Modern Physics, Chinese Academy of Sciences) ;
  • Juan Li (Institute of Modern Physics, Chinese Academy of Sciences)
  • Received : 2022.09.08
  • Accepted : 2022.12.21
  • Published : 2023.04.25
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Abstract

Beam position measurement system can not only provide the beam position monitoring, but also be used for global orbit correction to reduce beam loss risk and maximize acceptance. The Beam Position Monitors (BPM) are installed along the synchrotron to acquire beam position with the front-end electronics and data acquisition system (DAQ). To realize high precision orbit measurement in the main heavy ion synchrotron and cooling storage ring of heavy-ion research facility in Lanzhou (HIRFL-CSRm), a series of alignment and calibration work has been implemented on the BPM and its DAQ system. This paper analyzed the tests performed in the laboratory as well as with beam based on the developed algorithms and hardware. Several filtering algorithms were designed and implemented on the acquired BPM raw data, then the beam position and resolution were calculated and analyzed. The results show that the position precision was significantly improved from more than 100 ㎛ to about 50 ㎛ by implementing the new designed filtering algorithm. According to the analyzation of the measurement results and upcoming physical requirements, further upgrade scheme for the BPM DAQ system of CSRm based on field programmable gate array (FPGA) technology was proposed and discussed.

Keywords

Acknowledgement

Work is sponsored by Natural Science Foundation of China (NSFC)-Youth Fund under contract No. 11905271 and the Operation and Maintenance Fund of HIRFL under contract No. Y9HIRLL100.The authors are acknowledged to numerous colleagues of IMP accelerator physical group for their fruitful collaboration throughout the beam position measurement process.

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