神光Ⅲ原型上扩展X射线吸收精细结构谱实验研究  

Experiment study of extended X-ray absorption fine structure spectrum on SG-Ⅲ prototype facility

作　　者：胡云[1] 张继彦[1] 江少恩[1] 王哲斌[1] 蒲昱东[1] Hu Yun;Zhang Jiyan;Jiang Shaoen;Wang Zhebin;Pu Yudong(Research Center of Laser Fusion,CAEP,P.O.Box 919-986,Mianyang 621900,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

出　　处：《强激光与粒子束》2020年第5期30-36,共7页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(11475154)。

摘　　要：介绍了在大型激光装置上进行扩展X射线吸收精细结构(EXAFS)谱压缩物态参数测量的基本原理,以及为获得高质量EXAFS谱在神光Ⅲ原型装置上进行的实验研究。实验采用玻璃靶球、CH靶丸和金球作为EXAFS谱测量的背光源,通过多发次叠加、光子数累积的方法获得了信噪比良好的金属Ti在常温常压下的EXAFS谱,数据处理结果表明,实验测得的金属Ti EXAFS谱拟合结果与同步辐射实验拟合结果相吻合,表明实验设计的正确性与可靠性。对实验结果的分析表明,影响EXAFS谱质量的因素主要是光子计数、测量系统谱分辨率、噪声以及实验器件上的瑕疵。This article intoduces the principle of extended X-ray absorption fine structure(EXAFS) as parameter diagnostic method on large laser facilities, as well as the experiments on SG-Ⅲ prototype facility for high quality EXAFS. Using glass ball, CH capsule and Au ball as backlighters, through multi-shots accumulation method, EXAFS of Ti in ambient condition with good signal-to-noise ratio were obtained. The experiment results coincide well with the results of the synchrotron radiation experiment, indicating the correctness and reliability of the experimental design.Analysis of the results show the factors affecting the EXAFS spectrum quality are photon counts, spectral resolution,noise and flaws on apparatuses.

关 键 词：扩展X射线吸收精细结构 X射线源 大型激光装置 压缩物态 SGIII原型 

分 类 号：TN24[电子电信—物理电子学]