Tuning control system of a third harmonic superconducting cavity in the Shanghai Synchrotron Radiation Facility

Peng-Peng Gong; Yu-Bin Zhao; Hong-Tao Hou; Zhi-Gang Zhang; Xiang Zheng; Xiao-Yun Pu; Kai Xu; Qiang Chang; Jian-Fei Liu

doi:10.1007/s41365-019-0669-0

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Tuning control system of a third harmonic superconducting cavity in the Shanghai Synchrotron Radiation Facility

SYNCHROTRON RADIATION TECHNOLOGY AND APPLICATIONS | Updated：2021-02-01

- Tuning control system of a third harmonic superconducting cavity in the Shanghai Synchrotron Radiation Facility
- Nuclear Science and Techniques Vol. 30, Issue 10, Article number: 157(2019)
- Affiliations：
  
  1.Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
  2.University of Chinese Academy of Sciences, Beijing 100049, China
  3.Shanghai Key Laboratory of Cryogenics & Superconducting RF Technology, Shanghai 201800, China
- Author bio：
  
  Corresponding author, liujianfei@sinap.ac.cn
- Funds：
- DOI：10.1007/s41365-019-0669-0
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Peng-Peng Gong, Yu-Bin Zhao, Hong-Tao Hou, et al. Tuning control system of a third harmonic superconducting cavity in the Shanghai Synchrotron Radiation Facility. [J]. Nuclear Science and Techniques 30(10):157(2019)
DOI：

Peng-Peng Gong, Yu-Bin Zhao, Hong-Tao Hou, et al. Tuning control system of a third harmonic superconducting cavity in the Shanghai Synchrotron Radiation Facility. [J]. Nuclear Science and Techniques 30(10):157(2019) DOI： 10.1007/s41365-019-0669-0.

摘要

Abstract

Beam lifetime is dominated by Touschek scattering at the Shanghai Synchrotron Radiation Facility (SSRF). Touschek loss rate is affected by probability for scattering beyond the RF acceptance and the volume charge density of the bench. In the phase II upgrade of the SSRF, a third harmonic superconducting cavity will be used to enhance the Touschek lifetime by lengthening the bunches. The Touschek lifetime improvement factor is affected by the voltage of a harmonic cavity. To stabilize the cavity voltage, a tuning control system was designed to control it. The design of the tuning control system was based on the SSRF third generation low-level RF control system. Some hardware and specialized algorithms were redesigned to fit the harmonic cavity control. The design of the tuning control system is complete, and the control system has been tested. The test result shows that the fluctuation of amplitude is < ±0.34% within 1.5 h, which satisfies the stability requirement.

关键词

Keywords

Passive harmonic cavityLow level radio frequencyShanghai Synchrotron Radiation FacilityTouschek lifetime

references

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