Milathianaki D, Hawreliak J, McNaney J M, El-Dasher B S, Saculla M D, Swift D C, Lorenzana H E, Ditmire T
Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
Rev Sci Instrum. 2009 Sep;80(9):093904. doi: 10.1063/1.3230647.
We report on a focusing x-ray diffraction geometry capable of high-resolution in situ lattice probing from dynamically loaded polycrystalline and amorphous materials. The Seeman-Bohlin-type camera presented here is ideally suited for time-resolved x-ray diffraction measurements performed on high energy multibeam laser platforms. Diffraction from several lattice planes of ablatively shock-loaded 25 mum thick Cu foils was recorded on a focusing circle of diameter D=100 mm with exceptional angular resolution limited only by the spectral broadening of the x-ray source. Excellent agreement was found between the density measured using x-ray diffraction and that inferred from Doppler velocimetry and the known shock Hugoniot of Cu. In addition, x-ray diffraction signal was captured from an amorphous material under static conditions.
我们报道了一种聚焦X射线衍射几何结构，它能够对动态加载的多晶和非晶材料进行高分辨率的原位晶格探测。这里介绍的西曼-博林型相机非常适合在高能多束激光平台上进行的时间分辨X射线衍射测量。在直径D = 100 mm的聚焦圆上记录了烧蚀冲击加载的25μm厚铜箔几个晶格平面的衍射，其角分辨率极佳，仅受X射线源光谱展宽的限制。利用X射线衍射测得的密度与从多普勒测速法推断出的密度以及已知的铜的冲击雨贡纽曲线之间发现了极好的一致性。此外，还在静态条件下从一种非晶材料中捕获了X射线衍射信号。
