双自由度诊断高能电子透镜成像技术  

Dual degrees of freedom diagnosis with high energy electron lens radiography

作　　者：肖家浩 杜应超[1,2] 李豪卿 赵永涛 盛亮[3] Xiao Jiahao;Du Yingchao;Li Haoqing;Zhao Yongtao;Sheng Liang(Department of Engineering Physics,Tsinghua University,Beijing 100084,China;Key Laboratory of Particle and Radiation Imaging(Tsinghua University),Ministry of Education,Beijing 100084,China;State Key Laboratory of Intense Pulsed Radiation Simulation and Effect,Northwest Institute of Nuclear Technology,Xi’an 710024,China;School of Physics,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]清华大学工程物理系,北京100084 [2]粒子与辐射成像教育部重点实验室(清华大学),北京100084 [3]西北核技术研究所强脉冲辐射环境模拟与效应国家重点实验室,西安710024 [4]西安交通大学物理学院,西安710049

出　　处：《强激光与粒子束》2022年第6期110-117,共8页High Power Laser and Particle Beams

基　　金：National Key R&D Program of China(2019YFA0404900)。

摘　　要：电磁场及流体演化过程信息的获取在高能量密度物理、可控核聚变及实验天体物理的研究中起着重要的作用,然而在实验过程中,电磁场信息及流体信息的同步获取是非常困难的。基于高能电子透镜成像技术,利用面密度差分的方法,提出了一种可以实现面密度和场积分强度同时获取的双自由度诊断设计方案。结合了蒙特卡罗模拟和束流光学分析,该方案在相对较强的电磁场情况下的适用性得到了验证。此外,我们可以通过改变Fourier面处光阑的形状将其适用区间扩展到低电磁场强度相空间。结合高能电子束相对论速度及超短脉冲的特点,该技术非常适用于磁流体超快演化过程的诊断。The evolution of electromagnetic field and fluid is important in the research of high energy density physics,controlled nuclear fusion,and laboratory astrophysics.But in experiment,it is difficult to get the density and electromagnetic field distribution simultaneously.Based on high energy electron lens radiography,this paper proposes dual degrees of freedom diagnosis(DDFD)by constructing areal density difference.Combining the Monte-Carlo simulation and beam optics analysis,the feasibility of this method when the diagnosed system includes relatively strong electromagnetic field has been validated.Besides,changing the aperture as a ring can effectively improve the resolution in low E/B field and low areal density situation.The simulation results indicate that this method works well.Considering the characters of electron beams,this method is quite suitable for the electromagnetic fluid diagnosis.

关 键 词：高能电子透镜成像 场积分强度测量 面密度诊断 双自由度诊断 超快成像技术 

分 类 号：O463.1[机械工程—光学工程]