31.02MHz回旋加速器谐振腔Dee电压的标定

Dee Voltage Calibration of 31.02 MHz Cyclotron Resonance Cavity

中国科学院近代物理研究所医用重离子加速器(HIMM)高频系统31.02 MHz回旋加速器谐振腔已完成设计加工和腔体的老炼,并投入正常运行。高频腔体的设计峰值Dee电压要求达到70 k V,但是Dee电压准确计算比较困难,可以通过CST仿真软件对腔体进行模拟得到高频腔体的RP/Q0值,结合输入到腔体的实际功率,计算出腔体的实际电压值。为了验证Dee电压的准确性,在相同的腔体输入功率条件下,利用韧致辐射法测量腔体电压,测量结果与计算结果误差在0.6%以内。

The 31.02 MHz cyclotron RF system of Heavy Ion Medical Machine（HIMM） in IMP（Institute of Modern Physics, Chinese Academy of Sciences） has completed the design and commssioning,and now has already been put into operation. Its peak voltage requires 70 k V, but the precise calculation of the Dee voltage is still a difficulty problem, we can get the value Rp/Q0 of the cavity by CST simulation, and then combining the actual input power for cavity to calculate the real Dee voltage. In order to verify its accuracy, we use the bremsstrahlung method to test the cavity voltage under the condition of same input power. The error between test results and calculation is less than 0.6%.