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Optimization of the cavity beam-position monitor system for the Shanghai soft X-ray free-electron laser user facility

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Abstract

To achieve high-efficiency operation of the high-gain free-electron laser (FEL), the electron beams and radiated photon beams need to be overlapped precisely and pass through the entire undulator section. Therefore, a high-resolution beam-position monitor (BPM) is required. A cavity BPM (CBPM) with a resonant cavity structure was developed and used in the Shanghai Soft X-ray FEL (SXFEL) test facility and can achieve a position resolution of \(< {1}\upmu \mathrm{m}\). The construction and operation of the SXFEL user facility also bring about higher requirements for beam-position measurement. In this case, the factors that affect the performance of the CBPM system were further analyzed. These included the amplitude and phase stability of the local oscillator, stability of the trigger signal, performance of the radio frequency front-end, signal processing electronics, and signal processing algorithms. Based on the upgrade and optimization of the system, a beam test platform was built at the end of the linear acceleration section of the SXFEL, and the experimental results show that the position resolution of the system can reach 177 nm at a bunch charge of 500 pC, and the dynamic range is controlled within \(\pm {300}\upmu \mathrm{m}\), and the relative measurement uncertainty of the bunch charge can reach 0.021\(\%\), which are significant improvements compared to the attributes of the previous system.

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Authors and Affiliations

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

    Jian Chen, Yong-Bin Leng, Lu-Yang Yu, Long-Wei Lai & Ren-Xian Yuan

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

    Yong-Bin Leng

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  1. Jian Chen
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  4. Long-Wei Lai
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Jian Chen, Yong-Bin Leng, Lu-Yang Yu, Long-Wei Lai and Ren-Xian Yuan. The first draft of the manuscript was written by Jian Chen and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Jian Chen.

Additional information

This work was supported by the National Key Research and Development Program of China (No. 2016YFA0401903), National Natural Science Foundation of China (No. 12175293) and the Young and Middle-Aged Leading Scientists, Engineers and Innovators through the Ten Thousand Talent Program.

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Chen, J., Leng, YB., Yu, LY. et al. Optimization of the cavity beam-position monitor system for the Shanghai soft X-ray free-electron laser user facility. NUCL SCI TECH 33, 124 (2022). https://doi.org/10.1007/s41365-022-01117-8

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