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Beam performance of the SHINE dechirper

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Abstract

A corrugated structure is built and tested on many FEL facilities, providing a ‘dechirper’ mechanism for eliminating energy spread upstream of the undulator section of X-ray FELs. The wakefield effects are here studied for the beam dechirper at the Shanghai high repetition rate XFEL and extreme light facility (SHINE), and compared with analytical calculations. When properly optimized, the energy spread is well compensated. The transverse wakefield effects are also studied, including the dipole and quadrupole effects. By using two orthogonal dechirpers, we confirm the feasibility of restraining the emittance growth caused by the quadrupole wakefield. A more efficient method is thus proposed involving another pair of orthogonal dechirpers.

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Authors and Affiliations

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

    You-Wei Gong, Wei-Jie Fan & Ming-Hua Zhao

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

    You-Wei Gong & Wei-Jie Fan

  3. Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201210, China

    Meng Zhang & Duan Gu

Authors
  1. You-Wei Gong
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  2. Meng Zhang
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  3. Wei-Jie Fan
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  4. Duan Gu
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  5. Ming-Hua Zhao
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by You-Wei Gong, Meng Zhang and Duan Gu. The first draft of the manuscript was written by You-Wei Gong and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Duan Gu.

Additional information

This work was supported by the Youth Innovation Promotion Association CAS (Nos. 2018300 and 2021282), the National Key Research and Development Program of China (No. 2018YFE0103100), and the National Natural Science Foundation of China (No. 11935020).

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Gong, YW., Zhang, M., Fan, WJ. et al. Beam performance of the SHINE dechirper. NUCL SCI TECH 32, 29 (2021). https://doi.org/10.1007/s41365-021-00860-8

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  • DOI: https://doi.org/10.1007/s41365-021-00860-8

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