RF design optimization for the SHINE 3.9 GHz cavity

Yu-Xin Zhang; Jin-Fang Chen; Dong Wang

doi:10.1007/s41365-020-00772-z

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RF design optimization for the SHINE 3.9 GHz cavity

SYNCHROTRON RADIATION TECHNOLOGY AND APPLICATIONS | Updated：2021-01-26

- RF design optimization for the SHINE 3.9 GHz cavity
- Nuclear Science and Techniques Vol. 31, Issue 7, Article number: 73(2020)
- Affiliations：
  
  1.Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China
  2.ShanghaiTech University, Shanghai 201210, China
  3.Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China
- Author bio：
  
  Corresponding author, chenjinfang@zjlab.org.cn
- Funds：
- DOI：10.1007/s41365-020-00772-z
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Yu-Xin Zhang, Jin-Fang Chen, Dong Wang. RF design optimization for the SHINE 3.9 GHz cavity. [J]. Nuclear Science and Techniques 31(7):73(2020)
DOI：

Yu-Xin Zhang, Jin-Fang Chen, Dong Wang. RF design optimization for the SHINE 3.9 GHz cavity. [J]. Nuclear Science and Techniques 31(7):73(2020) DOI： 10.1007/s41365-020-00772-z.

摘要

Abstract

The Shanghai High-repetition-rate XFEL and Extreme Light Facility (SHINE) under construction is designed to be one of the most advanced free electron laser (FEL) facilities in the world. The main part of the SHINE facility is an 8 GeV superconducting Linac operating in continuous wave (CW) mode. The Linac consists of seventy-five 1.3 GHz and two 3.9 GHz cryomodules. Based on the design and experience of 3.9 GHz cavities in the European X-ray Free Electron Laser (E-XFEL) and the Linac Coherent Light Source-II (LCLS-II) projects, we optimize the SHINE 3.9 GHz cavity design to adapt it for CW mode operation. In this paper, we present a particular redesign of the end-group for the SHINE 3.9 GHz superconducting cavity that includes a redesign of the end-cell and beam pipe to shift away the potentially troublesome lowest high order modes(HOMs), a modification of the main coupler antenna, and a tuning of the HOM notch filter to meet the cavity requirements. RF losses calculations on the HOM coupler antennas show that the overheating on the inner conductor at the operating mode is diminished significantly. Furthermore, we have also studied the HOMs to ensure there are no dangerously trapped modes in the optimized cavity design.

关键词

Keywords

Superconducting cavityHigher order modesRF design3.9 GHz

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