Z箍缩动态黑腔动力学及辐射特性初步实验研究

Preliminary experimental study on implosion dynamics and radiation character of Z-pinch dynamic hohlraum

在"强光一号"装置进行的Z箍缩动态黑腔实验中,初步系统研究了动态黑腔的内爆动力学特性及辐射特性的一般规律.通过高空间分辨图像,对丝阵与泡沫黑腔碰撞前后泡沫辐射场的变化,泡沫对不稳定性发展的抑制开展了细致研究.实验结果显示,动态黑腔负载内爆的辐射功率波形呈现双峰结构,首峰和主峰分别对应于碰撞和滞止过程.8mm负载的内爆速度高于12mm负载,但其他内爆动力学参数和辐射参数均无明显差异.实验使用的泡沫黑腔能够很好地抑制不稳定性的发展,但在泡沫内部未能实现对辐射的均匀控制,滞止泡沫等离子体柱上仍能轻易区分辐射较强和辐射较弱的区域.

The Z-pinch dynamic hohlraum （ZPDH）, as implemented on qiangguang-1 facility at NINT, is composed of an annular tungsten plasma that implodes onto a coaxial foam convertor. The collision between tungsten Z pinch and foam convertor launches a strong shock. The shock generates a strong radiation pulse, referred as the first radiation power peak, then the radiation is trapped by the tungsten Z pinch. As pinch diameter decreases, the second radiation power pulse rises and acts as the main power peak. The radiation and dynamic characteristics do not show obvious difference between the 8 mm and 12 mm wire array configurations. Hence, it is important to notice that the foam reduces the influence of global instability generated by MRT instability on stagnated pinch, especially reduces the growth of m=0 and m=1 MHD instability.