激光等离子体X射线能谱诊断

摘要

为了诊断激光装置聚爆靶辐射等离子体内部的分布及运动过程,搭建了基于球面弯曲晶体的能谱成像系统.该系统的核心元件为弯曲半径为200 mm的石英球面弯曲晶体(1011),利用晶体的晶格结构进行反射,利用弯曲表面实现聚焦.在中国工程物理研究院神光Ⅲ原型激光装置上利用该能谱成像系统首次进行X射线能谱成像实验.IP成像板得到了清晰的高Z元素Au等离子体X射线能谱.能谱信息分析显示,石英球面弯曲晶体得到的能谱分辨率约为1 380,与能谱分辨模型理论值的误差为3.9%.该结果表明石英球面弯曲晶体具有很好能谱分辨能力.%In order to diagnose the inner distribution and movement process of pellet implosion target plasma for laser-driven Inertial Confinement Fusion (ICF) facility, an energy spectrum imaging system based on spherically bent crystal was built.The core element of the system was a spherically bent quartz crystal (1011) with bending radius of 200 mm, of which the lattice structure enabled reflection and the bent surface made focus.The energy spectrum imaging system was performed to first conduct X-ray energy spectrum imaging on SG Ⅲ prototype laser equipment at the Chinese Academy of Engineering Physics (CAEP).Clear X-ray energy spectrum of the high Z element Au plasma was obtained on IP imaging plate.The analysis on the energy spectrum information shows that the energy resolution ratio gained from spherically bent quartz crystal is approximately 1 380, and the error is 3.9% compared with the theory value of energy spectrum resolution model.The result shows that spherically bent quartz crystal has good energy spectrum resolution capacity.