Design and performance study of a dielectric-filled cavity beam current monitor for HUST-PTF

Ji-Qing Li; Kuan-Jun Fan; Zheng-Zheng Liu; Jian Wang; Qu-Shan Chen; Jin-Feng Yang

doi:10.1007/s41365-023-01278-0

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Design and performance study of a dielectric-filled cavity beam current monitor for HUST-PTF

ACCELERATOR, RAY TECHNOLOGY AND APPLICATIONS | Updated：2023-09-19

- Design and performance study of a dielectric-filled cavity beam current monitor for HUST-PTF
- Design and performance study of a dielectric-filled cavity beam current monitor for HUST-PTF
- 核技术（英文版） 2023年34卷第8期文章编号：129
- Affiliations：
  
  1.State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
  2.The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
- Author bio：
  
  † kjfan@hust.edu.cn
- Funds：
  
  National Natural Science Foundation of China(12235005);National Key Research and Development Program of China(2016YFC0105309)
- DOI：10.1007/s41365-023-01278-0
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Design and performance study of a dielectric-filled cavity beam current monitor for HUST-PTF[J]. 核技术（英文版）, 2023,34(8):129

Ji-Qing Li, Kuan-Jun Fan, Zheng-Zheng Liu, et al. Design and performance study of a dielectric-filled cavity beam current monitor for HUST-PTF[J]. Nuclear Science and Techniques, 2023,34(8):129
Design and performance study of a dielectric-filled cavity beam current monitor for HUST-PTF[J]. 核技术（英文版）, 2023,34(8):129 DOI： 10.1007/s41365-023-01278-0.

Ji-Qing Li, Kuan-Jun Fan, Zheng-Zheng Liu, et al. Design and performance study of a dielectric-filled cavity beam current monitor for HUST-PTF[J]. Nuclear Science and Techniques, 2023,34(8):129 DOI： 10.1007/s41365-023-01278-0.

摘要

Abstract

To guarantee the exact proton dose applied to patients and ensure treatment safety while disrupting and destroying tumor cells, it is essential to accurately monitor the proton beam current in real-time during patient treatment. Because clinical treatment requires a proton beam current in the ñA range, nondestructive beam current monitors (BCMs) are preferred to minimize the degradation of beam quality. However, this poses significant challenges in accurately monitoring such extremely low beam intensities. This study proposes a cavity-type BCM equipped with a dielectric plate to reduce its dimensions and achieve sufficient measurement sensitivity for practical requirements. A prototype cavity BCM was fabricated, and offline testing was performed using a metal wire to simulate the beam to study its performance. Both the simulation and experimental results showed that the cavity BCM could measure ultralow proton beam currents with a resolution up to 0.03 nA.

关键词

Keywords

Proton therapyBeam currentCavity BCMNondestructive

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