Feedforward compensation of the insertion devices effects in the SSRF storage ring

Xin-Zhong Liu; Shun-Qiang Tian; Xu Wu; Meng Wang; Zhen-Tang Zhao; Bo-Yuan Feng

doi:10.1007/s41365-022-01052-8

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Feedforward compensation of the insertion devices effects in the SSRF storage ring

SYNCHROTRON RADIATION TECHNOLOGY AND APPLICATIONS | Updated：2022-07-27

- Feedforward compensation of the insertion devices effects in the SSRF storage ring
- Feedforward compensation of the insertion devices effects in the SSRF storage ring
- Nuclear Science and Techniques 2022年33卷第6期文章编号：70
- 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 Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China
  4.Shanghai University, Shanghai 200444, China
  5.Tsinghua University, Beijing 100084, China
- Author bio：
  
  liuxinzhong@sinap.ac.cn
  tiansq@sari.ac.cn
  zhaozhentang@sinap.ac.cn
- Funds：
  
  Key Program of Shanghai Science and Technology Innovation Center(1174000565)
- DOI：10.1007/s41365-022-01052-8
  中图分类号：
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Xin-Zhong Liu, Shun-Qiang Tian, Xu Wu, 等. Feedforward compensation of the insertion devices effects in the SSRF storage ring[J]. Nuclear Science and Techniques, 2022,33(6):70

Xin-Zhong Liu, Shun-Qiang Tian, Xu Wu, et al. Feedforward compensation of the insertion devices effects in the SSRF storage ring[J]. Nuclear Science and Techniques, 2022,33(6):70
Xin-Zhong Liu, Shun-Qiang Tian, Xu Wu, 等. Feedforward compensation of the insertion devices effects in the SSRF storage ring[J]. Nuclear Science and Techniques, 2022,33(6):70 DOI： 10.1007/s41365-022-01052-8.

Xin-Zhong Liu, Shun-Qiang Tian, Xu Wu, et al. Feedforward compensation of the insertion devices effects in the SSRF storage ring[J]. Nuclear Science and Techniques, 2022,33(6):70 DOI： 10.1007/s41365-022-01052-8.

摘要

Abstract

The lattice of the Shanghai Synchrotron Radiation Facility (SSRF) storage ring was upgraded in the Phase-II beamline project, and thus far, 18 insertion devices (IDs) have been installed. The IDs cause closed-orbit distortions, tune drift, and coupling distortions in the SSRF storage ring, all of which are significant issues that require solutions. In this study, an ID orbit feedforward compensation system based on a response matrix using corrector coils was developed, and it was applied to all commissioned IDs in the SSRF storage ring. After correction, the maximum ID-induced horizontal and vertical orbit distortions were less than 5.0 μm and 3.5 μm, respectively. Some interesting phenomena observed during the measurement process were explained. Additionally, optical and coupling feedforward systems were developed using quadrupole and skew quadrupole magnets installed on the front and back of elliptically polarizing undulators (EPUs). Moreover, over nearly four months of operation, the developed strategy delivered a satisfactory performance in the SSRF storage ring.

关键词

Keywords

Shanghai Synchrotron Radiation Facility (SSRF)Insertion devices (IDs)Closed-orbit distortionTune shiftCouplingFeedforward

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