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High-power test of the single-periodic magnetically coupled standing-wave accelerating structure for a proton therapy linac

Wei Qin1, Yulu Huang1, Yuan He1,2, Zheng Gao1, Longbo Shi1, Jiaosai Li1, Chenxing Li1, Weiping Dou1, Xiaofeng Jin1 et al.

Zhouli Zhang1, Zongheng Xue1, Yujuan Zhao1, Tiancai Jiang1, Yupeng Yang1, Yuhui Guo1, Shilong Gao1,3, Yuqi Xin2, and Ruoxu Wang1

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Phys. Rev. Accel. Beams 29, 032001 – Published 12 March, 2026

DOI: https://doi.org/10.1103/9jql-8xgf

Abstract

A single-periodic magnetically coupled standing-wave accelerating structure prototype operating at 3 GHz for low phase velocity particles has been designed as the first tank of the 30–230 MeV accelerating section for the compact proton therapy linac developed by the Institute of Modern Physics, Chinese Academy of Sciences. Fabrication and rf measurement of the prototype have been completed. High-power test of the prototype was performed. The cavity could operate stably at the effective input power of around 5.7 MW, corresponding to the accelerating gradient of 38  MV/m at the pulse length of 5  μs and the repetition rate of 70 Hz. Further increasing the duty factor to 0.1%, the accelerating gradient decreased to 24  MV/m due to the uneven cooling of each single cell. The details of the high-power test setup and preparation, the process of rf conditioning, and the high-power test results are described in this paper. Limiting factors for higher accelerating gradients with high duty factors are discussed, and two novel cooling channel schemes are described.

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Phys. Rev. Accel. Beams 29, 032001– Published 12 March, 2026
  • Received 11 February 2025
  • Accepted 4 February 2026
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