螺线管传输并聚焦高能质子束的数值模拟  

Particle-In-Cell Simulation of High Energy Proton Beam Transported and Focused by Solenoid

作　　者：张忠亚 沈百飞[1,2,3] Zhang Zhongya1,2,3, Shen Baifei1,2,3(1. State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences, Shanghai 201800, China ; 2University of Chinese Academy of Sciences, Beijing 100049, China ; aSchool of Physical Science and Technology, Shanghai Tech University, Shanghai 200031, China)

机构地区：[1]中国科学院上海光学精密机械研究所强场激光物理国家重点实验室,上海201800 [2]中国科学院大学,北京100049 [3]上海科技大学物质科学与技术学院,上海200031

出　　处：《中国激光》2018年第9期276-282,共7页Chinese Journal of Lasers

基　　金：中国科学院先导B类专项(XDB16)

摘　　要：采用3Dparticle-in-cell(PIC)数值模拟方法,研究高品质高能质子束经由脉冲电流螺线管传输并聚焦于远端的情况。模拟结果表明:初始时刻中心能量为250MeV,能散度为10%,空间发散角小于15mrad的质子束,通过长度为760mm、中心磁感应强度为10.87T的通电螺线管,可以被聚焦于距离质子源约2.5m的远端,焦斑横截面直径约为1.2mm,小于模拟初始时刻的1.8mm,质子数目的损失小于3%。研究结果表明利用通电螺线管来传输和调控高能质子束流的方案是可行的。该方案可用于优化质子束流品质,促进激光驱动质子加速在癌症治疗等对质子束单能性和发散角要求较高的领域得到早日应用。Based on 3 Dparticle-in-cell（PIC）numerical simulation method,the high quality,high energy proton beam is transmitted and focused on the far end via a pulse current solenoid.Simulation results show that proton beam with peak energy of 250 MeV,energy spread of 10% and a spatial divergence angle less than 15 mrad can be focused on a spot 2.5 maway from the proton source,after transported in a 760-mm pulse power solenoid under magnetic field strength of 10.87 T.The focal spot cross section diameter is 1.2 mm,less than the initial proton beam spot size;meanwhile,the number loss of proton beam is less than 3%.We conclude that it is feasible to use a powered solenoid to transmit and regulate a high energy proton beam.This scheme can be used to optimize the proton beam quality and promote the laser-driven proton acceleration to be applied early in the fields such as cancer treatment,where high proton beam unipotency and small divergence angle are required.

关 键 词：原子与分子物理学 强场激光物理 螺线管 PIC数值模拟 质子束 离子光学 

分 类 号：O463.2[机械工程—光学工程]