单色化X射线显微成像实验研究

Experimental research of monochromatic X-ray microscopy

围绕激光惯性约束聚变(ICF)内爆压缩阶段高空间分辨、高能谱分辨的诊断需求,提出了一种将KB显微镜和衍射晶体组合的大视场、单色化成像系统。在实验室条件下,利用Fe靶X射线光管,采用KB显微镜结合高定向热解石墨(HOPG)对网格进行背光成像,晶体选能后的成像结果表明,系统的视场能达到800μm,其中高分辨区域成像的分辨率为37μm。采用能谱探测器测试成像能谱,结果表明,系统的能量分辨率为28,验证了系统的单色性能。该系统兼顾了大视场、空间分辨和能量分辨,对内爆压缩阶段实验中热斑结构及混合效应的研究具有重要应用。

Based on the diagnostic requirements of high spatial resolution and high energy spectral resolution in the implosion compression stage of laser inertial confinement fusion(ICF),this paper proposes a large field of view and monochromatic imaging system,which combines KB microscope and diffractive crystal.Under the laboratory condition,the grid is backlight imaged by using the Fe target X-ray tube,with KB microscope and high oriented pyrolytic graphite(HOPG).The imaging results after the crystal energy selection show that the field of view of the system can reach 800μm,and the resolution of high-resolution area imaging is 37μm.The detecting results show that the energy resolution of the system is 28,which verifies the monochromatic performance of the system.The system takes into account large field of view,spatial resolution and energy resolution,and has an important application in the research of hot spot structure and mixing effect in the experiment of implosion compression stage.