高能电子成像暗场成像技术特性研究及改进方案  

Characteristics and improvement scheme of dark-field imaging of high energy electron radiography

作　　者：肖家浩[1,2] 曹树春 张子民[1,2] 李中平 申晓康[1,2] 赵全堂 程锐[1,2] 刘铭 赵永涛[1] 袁平 Xiao Jiahao;Cao Shuchun;Zhang Zimin;Li Zhongping;Shen Xiaokang;Zhao Quantang;Cheng Rui;Liu Ming;Zhao Yongtao;Yuan Ping(Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院近代物理研究所,兰州730000 [2]中国科学院大学,北京100049

出　　处：《强激光与粒子束》2019年第11期105-111,共7页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目（11875303,11435015,11505251,Y940010HJ0）;科技部国家重点研发计划（2016YFE0104900）;中国科学院科研仪器设备研究项目（Y740010YZB,Y740020YHZ）

摘　　要：基于EGS5与PARMELA模拟软件组成的高能电子成像系统,对暗场成像的模拟研究发现,通过调节光阑位置实现的暗场成像结果存在失真现象。针对该失真现象提出的改进方案,消除了暗场成像结果的失真。通过对40 MeV电子透射7~224μm的铝样品开展的成像模拟结果表明:40 MeV高能电子暗场成像技术在铝样品厚度小于25μm情况下具有明显的面密度分辨优势,且空间分辨率达到μm量级,非常适用于高能量密度物质诊断。The simulations of dark-field imaging of high energy electron radiography show that the dark field imaging is distorted in the case of large angle selected.In order to eliminate distortion,an optimized scheme is proposed in this paper.The results of high Energy Electron Radiography(HEER)simulations by optimization show that the dark-field image has better areal density resolution when the thickness of aluminum target is less than 25μm,and the spatial resolution of dark-field imaging is about several microns.In summary,dark-field imaging of high energy electron radiography is ideal to thin warm dense matter specimen diagnosis.

关 键 词：高能量密度物理 高能电子成像 暗场成像 空间分辨能力 面密度分辨本领 

分 类 号：O463.1[机械工程—光学工程]