1 MeV介质壁质子直线加速器数值模拟优化  

Numerical Simulation and Optimization of 1 MeV Dielectric Wall Proton Liner Accelerator

作　　者：王树青[1] 廖鹏[1] 彭丽[1] 杨超[1] 印茂伟[1] 

机构地区：[1]西南科技大学国防科技学院,四川绵阳621010

出　　处：《西南科技大学学报》2015年第3期94-98,共5页Journal of Southwest University of Science and Technology

基　　金：国家自然科学基金重点基金(11035004);中物院科学技术发展基金(2013A0402018);国家自然科学基金青年基金(51407169);西南科技大学博士基金项目(13ZX7106);浙江省科技计划项目(2013C33073)

摘　　要：采用自主开发的电磁粒子模拟软件对中国工程物理研究院研制的1 Me V介质壁质子加速器进行数值仿真,并对影响介质壁加速器的主要参数进行了系统分析,得到了可靠的优化方案。模拟结果显示:保持加速梯度20MV/m的情况下,HGI越厚,得到的束流能量峰值越高,束流值越大,需综合考虑加速器尺寸和所需的束流和束能,以选取合适的HGI厚度;峰值电流随加速梯度的减小而增大,即在特定要求,可以通过损失部分加速梯度得到更大的输出电流;输出束流峰值随输入电流大小线性增长,且输入束流每增加3 m A,对应输出峰值增加0.12 A,增长比率为1:40;输出束流峰值随输入束流半径的增加而减少,随法兰内半径的增大而增加;随着延时间距的增大,束流先增大后减小,最佳延时为21,21.5,21.7 ns,且电流值为不考虑延时的1.73倍。In this paper,1 Me V dielectric wall proton accelerator which is developed by China Academy of Engineering Physics was numerically simulated by the self- developed electromagnetic particle simulation software. A reliable optimization scheme was obtained after the system analyzing of its major parameters.The simulation results are the following： With the accelerating gradient of 20 MV / m,the thicker the HGI is,the higher beam energy peak and beam value become. Accelerator’s size,the needed beam and beam energy should be considered synthetically in order to choose a suitable thick of HGI. The peak current increases with the accelerating gradient decreasing,which means larger output current would be obtained by losing part of accelerating gradient in the specific requirements. The output beam peak grows linearly with the input current and when the input current increases by every 3 m A,the output beam peak increases by0. 12 A,in which growth rate is 1： 40. The output beam peak decreases with the input beam radius increasing and increases with the flange inner radius increasing. With the rise of delay interval,the beam current increases first and then decreases. The optimal delay are 21,21. 5,21. 7 ns and the current is1. 73 times the value of the one without considering the delay.

关 键 词：介质壁加速器 电磁粒子模拟 质子治疗 

分 类 号：TL53[核科学技术—核技术及应用]