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

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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 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.

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Acknowledgements

The authors would like to thank Dr. Wei Zhang and He-Yun Wang for their useful discussions and the machine setup.

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Authors and Affiliations

  1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China

    Xin-Zhong Liu, Shun-Qiang Tian, Xu Wu, Meng Wang & Zhen-Tang Zhao

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Xin-Zhong Liu, Xu Wu & Zhen-Tang Zhao

  3. Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201204, China

    Shun-Qiang Tian, Xu Wu & Zhen-Tang Zhao

  4. Shanghai University, Shanghai, 200444, China

    Meng Wang

  5. Tsinghua University, Beijing, 100084, China

    Bo-Yuan Feng

Authors
  1. Xin-Zhong Liu
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  2. Shun-Qiang Tian
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  3. Xu Wu
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  4. Meng Wang
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  5. Zhen-Tang Zhao
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  6. Bo-Yuan Feng
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Contributions

All the authors contributed to the conception and design of the study. Material preparation, data collection and analysis were performed by Xin-Zhong Liu, Shun-Qiang Tian, Xu Wu, Meng Wang and Zhen-Tang Zhao. The first draft of the manuscript was written by Xin-Zhong Liu, and all authors commented on the previous versions of the manuscript. All authors have read and approved the final manuscript.

Corresponding authors

Correspondence to Shun-Qiang Tian or Zhen-Tang Zhao.

Additional information

This work was supported by the Key Program of Shanghai Science and Technology Innovation Center (No.1174000565).

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Liu, XZ., Tian, SQ., Wu, X. et al. Feedforward compensation of the insertion devices effects in the SSRF storage ring. NUCL SCI TECH 33, 70 (2022). https://doi.org/10.1007/s41365-022-01052-8

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  • DOI: https://doi.org/10.1007/s41365-022-01052-8

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