光学渡越辐射理论及其在直线感应加速器脉冲电子束诊断中的应用  

Theory of optical-transition radiation and its application to pulsed electron beam diagnoses on linear induction electron accelerator

作　　者：王远[1] 江孝国[1] 陈思富[1] 石金水[1] 李劲[1] 杨国君[1] Wang Yuan;Jiang Xiaoguo;Chen Sifu;Shi Jinshui;Li Jin;Yang Guojun(Institute of Fluid Physics,CAEP,P.O.Box 919-106,Mianyang 621900,China)

机构地区：[1]中国工程物理研究院流体物理研究所,四川绵阳621999

出　　处：《强激光与粒子束》2020年第5期77-84,共8页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(11375162,10675104)。

摘　　要：匀速运动的带电粒子在穿过具有不同介电常数的两种媒质界面时要产生所谓光学渡越辐射。该辐射在粒子的入射平面上呈偏振行为;从辐射强度的角分布可以确定入射粒子的能量。在入射到双膜系统的情况下,由于干涉的发生,在第二膜前表面的强度角分布有振荡行为。利用这些现象,可对脉冲电子束包络半径、束电流密度的横向分布,束能量以及横向散角进行测量,依照这一原理在各LIA加速器上进行的脉冲电子束参数测量,获得的有效数据极大地提高了加速器的调试效率。The so called optical-transition radiation(OTR)occurs when the charged particles with constant speed pass through interface of two media with different dielectric coefficient.The radiation shows polarization behavior while the charged particle arrives at the incidence plane,the energy of the incidence particle can be determined according to the OTR angle distribution patterns.The OTR angle distribution oscillates at the second foil’s surface due to the interference while the electron beam is entering a double foil system.Thus parameters of the pulse electron beam can be measured by using these phenomena.The parameters include electron beam envelope radius,transversal distribution of electron beam current density,electron beam energy,and electron beam’s transverse divergence.This theory is used to measure parameters of pulsed electron beam on a series of Dragon linear induction electron accelerators(LIAs)and obtain valid time-resolved results.This measurement ability has improved greatly the debugging efficiency of the Dragon LIAs.

关 键 词：直线感应加速器 光学渡越辐射 角分布 

分 类 号：TL53[核科学技术—核技术及应用] TB86[一般工业技术—摄影技术]