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Design optimization and cold RF test of a 2.6-cell cryogenic RF gun

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Abstract

To further improve the performance of accelerators, the first cryogenic normal-conducting RF gun in China was designed and manufactured. As a new and attractive trend, this optimized cryogenic RF gun can generate a low-emittance beam with a short-driven laser pulse because of its promising high gradient on the cathode. In this paper, optimization of the RF design and beam dynamics, including suppression of the peak RF field and elimination of the multipole mode, is presented. In addition, the emittance growth caused by the alignment deviation and RF jitter is discussed. After the gun was manufactured, a cold test was conducted at both room temperature and cryogenic conditions. At room temperature, the field distribution was obtained by the bead pull method. Under cryogenic conditions, the RF properties, such as the coupling coefficient and quality factor, varied with temperature. The test results agreed with the design. In the cryogenic test, vibration measurements were performed. Without vibration isolation, a maximum vibration of 50 \(\mu \text{m}\) was observed. These cold test results are the basis of the following high-power test.

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Authors and Affiliations

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

    Cheng Wang, Yi-Xing Lu & Lin Wang

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

    Cheng Wang, Yi-Xing Lu & Lin Wang

  3. Shanghai Synchrotron Radiation Facility, Chinese Academy of Sciences, Shanghai, 201204, China

    Cheng Wang, Jian-Hao Tan, Xiao-Xia Huang, Wen-Cheng Fang & Zhen-Tang Zhao

Authors
  1. Cheng Wang
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  2. Jian-Hao Tan
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  3. Xiao-Xia Huang
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  4. Yi-Xing Lu
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  5. Lin Wang
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  6. Wen-Cheng Fang
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  7. Zhen-Tang Zhao
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Cheng Wang, Jian-Hao Tan, Xiao-Xia Huang and Yi-Xing Lu. The first draft of the manuscript was written by Cheng Wang and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Cheng Wang.

Additional information

This work was supported by the National Key R&D Program of China (No. 2018YFF0109203) and ANSO (ANSO-CR-KP-2020-16).

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Wang, C., Tan, JH., Huang, XX. et al. Design optimization and cold RF test of a 2.6-cell cryogenic RF gun. NUCL SCI TECH 32, 97 (2021). https://doi.org/10.1007/s41365-021-00925-8

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  • DOI: https://doi.org/10.1007/s41365-021-00925-8

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