神光Ⅲ原型X射线荧光成像原理验证实验  

A Proof-of-Principle Experiment Demonstrating X-Ray Fluorescence Imaging at the Shenguang-Ⅲ Prototype Laser Facility

作　　者：姚立[1,2] 蒲昱东 韦敏习[1] 詹夏宇[1] 张兴[1] 晏骥[1] 杨轶濛[1] 侯立飞 丁永坤[3] Yao Li;Pu Yudong;Wei Minxi;Zhan Xiayu;Zhang Xing;Yan Ji;Yang Yimeng;Hou Lifei;Ding Yongkun(Laser Fusion Research Center,China Academy of Engineering Physics,Mianyang,Sichuan 621900,China;Department of Engineering Physics,Tsinghua University,Beijing 100084,China;Institute of Applied Physics and Computational Mathematics,Beijing 100094,China)

机构地区：[1]中国工程物理研究院激光聚变研究中心,四川绵阳621900 [2]清华大学工程物理系,北京100084 [3]北京应用物理与计算数学研究所,北京100094

出　　处：《光学学报》2020年第6期216-222,共7页Acta Optica Sinica

基　　金：国家重点研发计划(2017YFA0403300);国家自然科学基金(11505169)。

摘　　要：X射线荧光成像技术具有局域探测能力,适合诊断复杂几何构型流体运动,在实验室天体物理、惯性约束聚变等高能量密度物理领域具有重要的应用前景。基于神光Ⅲ原型激光装置,开展了X射线荧光成像的原理验证实验。实验采用聚4-甲基-1-戊烯泡沫掺杂TiO2纳米颗粒为静态客体,以钒等离子体辐射为荧光泵浦源,以平晶谱仪为分光和成像设备,成功获得了钛原子K壳层荧光的一维空间分辨强度轮廓。基于荧光产生和平晶成像原理,对荧光信号强度进行了定量估算,结果表明,模拟和实测荧光强度轮廓符合较好。该工作可为X射线荧光成像技术在复杂几何构型流体实验中的应用提供参考。X-ray fluorescence imaging(XRFI)is a promising diagnostic method with respect to the geometrically complex fluids in high-energy-density physics,including experimental astrophysics and inertial confinement fusion,because of its capability of detecting localized information.In this study,we have conducted a proof-of-principle experiment with respect to XRFI at the Shenguang-Ⅲprototype laser facility.In this experiment,a static object comprising poly-4-methyl-1-pentene foam and titanium dioxide nanoparticles was pumped with vanadium plasma radiation,resulting in the emission of titanium K-shell fluorescent photons.A flat-crystal spectrometer dispersed and imaged these fluorescent photons,and one-dimensional spatially resolved intensity profiles were successfully obtained.Further,the fluorescent intensity profiles were quantitatively simulated based on the theories related to fluorescence production and flat-crystal imaging,denoting good agreement with the experimental results.This research is directly useful for the application of XRFI to hydrodynamic experiments in case of complex geometries.

关 键 词：X射线光学 X射线荧光成像 平晶谱仪 掺钛泡沫 高功率激光器 

分 类 号：TL651[核科学技术—核技术及应用]