用于Z箍缩实验的多幅激光差分干涉与阴影成像诊断系统

Multiframe Laser Differential Interferometer and Shadowgraph System for Z-Pinch Experiments

发展了一种基于角谱分离的全光分幅方式的多幅激光差分干涉与阴影成像诊断系统，可以在一次实验中拍摄2。4幅、幅间隔3．12ns的高清晰阴影图像或干涉图像，并结合V差分干涉仪结构，可用于具有大密度梯度特征的z箍缩等离子体的电子密度的高时空分辨诊断。在PTS（Primary Test Stand）装置的柱状单壳层钨丝阵z箍缩实验中，一序列等离子体内爆阴影图像给出了内爆速度、压缩EE、磁瑞利泰勒（MRT）不稳定性演化过程等观测结果。在XP-1脉冲功率装置的平面钨丝阵实验中，得到的干涉图和电子密度计算结果给出了丝阵早期烧蚀阶段的等离子体分布及演化情况。

A multi-frame interferometer and shadowgraph system based on angular-spectrum-division all-optical frame imaging technique has been developed. The system is capable of shooting 2~4 high definition shadowgraphs or interferograms in one shot with frame interval of 3~12 ns. By the 4f differential interferometer structure, the system is applicable for diagnostics of electron density of Z-pinch plasma with high temporal and spatial resolution of large density gradient. In the cylindrical single-shell tungsten wire array Z-pinch experiments conducted on Primary Test Stand, a sequentially timed shadowgraphs of implosion plasma give implosion velocity, compression ratio, magneto Rayleigh Taylor （MRT） instability evolution, etc. In the planar tungsten wire array experiments conducted on XP-1, the interferograms and calculated electron densities give plasma distribution and evolution in the early stage of wire array ablation.