基于神光Ⅲ装置的光学诊断系统介绍

Optical diagnostic systems based on Shenguang Ⅲ

光学诊断系统在惯性约束聚变(Inertial Confinement Fusion,ICF)研究中具有重要的作用,可以较为直观地诊断聚变过程中的一些关键物理量和参数.本文介绍了神光Ⅲ原型和主机装置上配备的比较典型的三种光学诊断系统,包括成像型任意反射面速度干涉仪(VISAR)、惯性约束聚变反应速率测量系统以及背向散射光测量系统.VISAR可用于测量自由面速度和透明介质中的冲击波速度,是冲击波调速、材料压缩特性以及辐射测温研究的重要诊断技术;惯性约束聚变反应速率测量系统用于测量聚变反应的时间演化过程,是研究内爆动力学、理解混合效应的关键诊断技术;背向散射测量系统用于测量激光等离子体相互作用引起的背向散射光份额,为惯性约束物理实验激光能量与靶耦合效率参数提供了重要的数据支撑.

Optical diagnostic system plays an important role in inertial confinement fusion（ICF） experiment. Some key physical quantities and parameters in fusion can be diagnosed intuitively. In this review, three typical diagnostic systems on Shengang Ⅲ facility are introduced, including imaging velocity interferometer system for any reflector（VISAR）, fusionreaction diagnostic system and backscatter light diagnostic system. VISAR can be used to measure velocity of free surface or shock wave traveling history in transparent media, which is an important diagnostic technique for shock wave velocity regulation, material compression characteristics and radiation temperature measurement. The fusion reactionhistory diagnostic system can be used to accurately measure the fusion rate of ICF experiment. It＇s a key diagnostic technique to study implosion dynamics and understand the mixed effect. Backscatter light diagnostic system is capable to measuring the energetic quotient stimulated by laser and plasma interaction（LPI）, which produce important supports for calculating the coupling efficiency of driven laser and target.