铝丝阵Z箍缩辐射形成特征实验研究

Experimental study on radiation characteristics of aluminum wire-array Z-pinches

基于多种诊断设备获得的物理参数和物理图像,分析了8mm铝丝阵内爆各阶段的辐射特征。实验结果表明,铝丝阵的先驱等离子体在形成后未出现明显不稳定性特征。在向心箍缩阶段,出现了泡-钉(bubble-spike)结构,并伴有局部热点。结合分析空间分辨能谱图像,表明热点的形成与等离子局部的高温高密状态有关。通过对X光条纹像进行时间和空间的定标,得到透过50μm Be膜的等离子体热点的空间尺寸约为0.8mm,持续时间小于10ns。

Experimental results offered by an entire suite of diagnostics are analyzed and presented to provide a detailed pic- ture of the overall implosion process and resulting radiation output of aluminum wire array Z-pinches, including precursor radia tion during ablation, bubble spike structure, and local bright spots at stagnation. The precursor is stable after its formation. The bubble-spike structure pays a large influence on the formation of the bright spots, which can he seen at an axial position lack of trailing mass. The comparison between a fraction of spectra with spatial resolution and frame images shows that the formation of bright spots might be influenced by the high temperature and high density condition of local imploded plasma. The X-ray streak images filtered with 50μm Be show that the spatial size of hot spots is 0.8 mm and their life time is shorter than 10 ns.