基于神光Ⅲ原型的双轴速度干涉仪

在激光惯性约束聚变研究中不对黑腔和靶丸做额外处理的条件下,靶丸的早期驱动对称性一直缺少直观的观测手段.介绍了基于神光III原型装置发展的双轴任意反射面速度干涉仪技术及相应的实验结果.通过在靶丸内部安装小反射镜的方式,获得靶丸赤道及极区的冲击波速度历程.根据材料的反射率及其受X射线的影响程度,确定Al为现阶段反射镜的合适材料.对汇聚几何效应下的数据判读问题进行了分析,发现靶装配精度对该技术的影响很大.通过实验完成了双轴VISAR诊断技术的探索,可为进一步发展双轴速度干涉仪和多轴速度干涉仪的工作提供参考.

Two-axis Velocity Interferometer Technique Based on Shenguang-III Prototype Laser Facility

There is no useful diagnostic technique to measure the shock wave for the target asymmetry in early implosion without extra processing to black cavity and target during the study of laser inertial confinement fusion.The two-axis velocity interferometer system for any reflector was developed based on Shenguang-III prototype laser facility and the experimental results were introduced.Velocity history of shock wave in equatorial and polar of target was obtained by installing small mirror in the target.According to the reflectivity of the material and the influence by the X ray,it is determined that Al is the suitable material for the mirror at present.The difference between the plane shock loading and spherical shock loading was compared.It is found that the accurate for target equipment is the main reason for fewer signals.The diagnostic technique of two-axis velocity interferometer system for any reflector was explored through the experiment,which would give a reference to develop the two-axis velocity interferometer system or multi-axis velocity interferometer system.