闪光X射线衍射成像系统设计及实验方法  

Flash X-ray Diffraction Imaging System and Study on Experiment Approach

作　　者：唐波[1,2] 黑东炜[2] 马戈[2] 盛亮[2] 魏福利[2] 夏惊涛[2] 罗剑辉[2] 周海生[2] 

机构地区：[1]清华大学工程物理系,北京100084 [2]强脉冲辐射环境模拟与效应国家重点实验室(西北核技术研究所),西安710024

出　　处：《光子学报》2017年第12期78-82,共5页Acta Photonica Sinica

基　　金：强脉冲辐射环境模拟与效应国家重点实验室基金(No.SKLIPR1401Z)资助~~

摘　　要：为实现材料在冲击加载下微观动力学响应测量,基于小型闪光X射线源开展衍射成像系统设计.利用直流X光机及高纯锗探测器实现系统衍射光路的精确调节,克服了闪光X射线瞬时强度高及连续辐射本底强导致的衍射角度确定困难,并采用Scandiflash AB公司TD-450S和成像板建立了衍射成像系统.应用该系统在冲击加载实验中获得了LiF单晶单脉冲的Mo-Kα线静态及动态衍射图像.该闪光X射线衍射系统时间分辨率可达25ns,为冲击压缩实验中材料瞬时结构变化测量提供了新的实验方法.Flash X-ray diffraction imaging system based on flash X-ray generator（TD-450S of Scandiflash AB）and imaging plate was designed to measure microscopic response in shock wave compression studies.Due to intense Bremsstrahlung radiation,continuous X-ray generator and HPGe detector were used to regulate diffraction optical path.Diffraction signal of LiF single crystal was recorded using flash X-ray tube with molybdenum as the anode material under ambient conditions and shocked state.Results show that flash X-ray diffraction imaging system described here is useful for examining structural changes in shock compression experiments and temporal resolution is 25 ns.

关 键 词：X射线衍射 闪光X射线 冲击压缩实验 LiF单晶 微观响应 

分 类 号：O766.3[理学—晶体学]