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

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

机构地区：[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

出　　处：《Nuclear Science and Techniques》2023年第8期75-85,共11页核技术（英文）

基　　金：supported by the National Natural Science Foundation of China(No.12235005);the National Key Research and Development Program of China(No.2016YFC0105309).

摘　　要：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∼nA 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 off-line testing was performed using a metal wire to simulate the beam to study its performance.Both the simulation and experi-mental results showed that the cavity BCM could measure ultralow proton beam currents with a resolution up to 0.03 nA.

关 键 词：Proton therapy Beam current Cavity BCM NONDESTRUCTIVE 

分 类 号：TH77[机械工程—仪器科学与技术]