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Design and simulation of cavity BPM for BEPCII

  • 1. Key Laboratory of Particle Acceleration Physics and Technology, Institute of High Energy Physics, Chinese Academy of Science, Beijing, 100049, China;

  • 2. School of Physics, University of Chinese Academy of Science, Beijing, 100049, China

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  • Received Date: December 20, 2018
  • Revised Date: May 12, 2019
  • Accepted Date: May 13, 2019
  • Available Online: October 17, 2022
  • Published Date: June 02, 2019
    Abstract
  • BackgroundIn the linac of Beijing Electron Positron Collider II (BEPCII), the resolution of existing BPMs is several hundred microns. But the requirement of transverse position resolution of BPM for future top-up injection needs to be more precise.
    PurposeThis paper is mainly concerned about the design and simulation of the cavity beam position monitor (CBPM) for BEPCII linac and free electron laser (FEL). The requirement of beam transverse position resolution for linac is several microns, even a few nanometers for FEL.
    MethodsWhen the beam bunch goes through the CBPM, it can excite different electromagnetic field modes in resonator. In these modes, TM110 is the most sensitive to beam transverse position offset. The design of CBPM is aim to analyze the relationship between TM110 and beam transverse position by CST Studio and Ansys HFSS.
    ConclusionIn this research, we design a pair of rectangular slots for position cavity to revise the direction of electromagnetic field. The simulation result of theoretical resolution is able to reach 15 nm@1nC with the operating frequency 2500 MHz. It is obviously that CBPM has more excellent resolution than all of operating BPM in BEPCII. Meanwhile, the research of CBPM improves the application of beam detection technology in BEPCII and accumulates technology for future design of HEPS and FEL. The mechanical design of the prototype is being fabricated.
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    • References (13)
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    • Jiashen Zhou, Jianshe Cao, Yanfeng Sui, et al. Design and simulation of cavity BPM for BEPCII[J]. Radiation Detection Technology and Methods, 2019, 3(3): 49-49. DOI: 10.1007/s41605-019-0125-z
    Citation: Jiashen Zhou, Jianshe Cao, Yanfeng Sui, et al. Design and simulation of cavity BPM for BEPCII[J]. Radiation Detection Technology and Methods, 2019, 3(3): 49-49. DOI: 10.1007/s41605-019-0125-z
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    1. Xiao-Yu Liu, Fang-Fang Wu, Tian-Yu Zhou, et al. Design and offline testing of a resonant stripline beam position monitor for the IRFEL project at NSRL. Nuclear Science and Techniques, 2020, 31(7) DOI:10.1007/s41365-020-00778-7

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