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Radio frequency conditioning of an S-band accelerating structure prototype for compact proton therapy facility

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Abstract

The development of a high-gradient accelerating structure is underway to construct a compact proton linear accelerator for cancer treatment. Extensive experiments and numerous studies are being conducted to develop compact linear accelerators for proton therapy. Optimization of the electromagnetic and mechanical design has been performed to simplify the manufacturing process and reduce costs. A novel high-gradient structure with a low relativistic proton velocity (β), v/c = 0.38, was designed, fabricated, and tested at high power. The first full-scale prototype was also successfully tested with high radio frequency (RF) power, a repetition rate of 50 Hz, and pulse length of 3 µs to reach a high-gradient of 46 MV/m using a 50 MW S-band klystron power supply obtained from the Shanghai Soft X-ray Free Electron Laser Facility. This is the first high-power test in China, which is in line with the expected experimental goal. This study presents preliminary high-power testing of S-band standing wave accelerating structures with 11 cells. This work aims to verify the feasibility of using a high-gradient RF accelerating structure in compact proton therapy facilities. The cold test of the prototype cavity was completed in advance. Details of the high-power RF test setup, the process of RF conditioning, and the high-power results are described.

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Authors and Affiliations

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

    Yu Zhang, Wen-Cheng Fang, Cheng Wang, Yu-Qing Yang & Zhen-Tang Zhao

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

    Yu Zhang, Cheng Wang, Yu-Qing Yang & Zhen-Tang Zhao

  3. ShanghaiTech University, Shanghai, 201210, China

    Yu Zhang, Yu-Qing Yang & Zhen-Tang Zhao

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

    Wen-Cheng Fang, Xiao-Xia Huang, Jian-Hao Tan, Shao-Peng Zhong, Cheng-Cheng Xiao, Jun-Qiang Zhang & Zhen-Tang Zhao

Authors
  1. Yu Zhang
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  2. Wen-Cheng Fang
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  3. Xiao-Xia Huang
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  4. Jian-Hao Tan
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  5. Shao-Peng Zhong
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  6. Cheng-Cheng Xiao
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  7. Jun-Qiang Zhang
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  8. Cheng Wang
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  9. Yu-Qing Yang
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  10. 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 Yu Zhang, Wen-Cheng Fang, Xiao-Xia Huang, Jian-Hao Tan, Shao-Peng Zhong, Cheng-Cheng Xiao, Jun-Qiang Zhang, Cheng Wang, Yu-Qing Yang, and Zhen-Tang Zhao. The first draft of the manuscript was written by Yu Zhang and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding authors

Correspondence to Wen-Cheng Fang or Xiao-Xia Huang.

Additional information

This work was supported by National Key R&D Program of China (No. 2018YFF0109203).

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Zhang, Y., Fang, WC., Huang, XX. et al. Radio frequency conditioning of an S-band accelerating structure prototype for compact proton therapy facility. NUCL SCI TECH 32, 64 (2021). https://doi.org/10.1007/s41365-021-00891-1

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  • DOI: https://doi.org/10.1007/s41365-021-00891-1

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