Effect of core-corona plasma structure on seeding of instabilities in wire array Z pinches
Effect of core-corona plasma structure on seeding of instabilities in wire array Z pinches
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DOI：
10.1103/physrevlett.85.98
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发表时间：
2000-07
影响因子：
8.6
通讯作者：
Sergey Lebedev;F. N. Beg;S. Bland;J. Chittenden;A. E. Dangor;M. Haines;S. Pikuz;T. Shelkovenko-T.-Shelko
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文献类型：
--
作者：
Sergey Lebedev;F. N. Beg;S. Bland;J. Chittenden;A. E. Dangor;M. Haines;S. Pikuz;T. Shelkovenko-T.-Shelko
我们提出的第一个测量X射线照相的发展过程中的线阵Z箍缩的内爆阶段的不稳定性。每根导线的致密核心上的微扰的播种是由全球JxB力从核心的低密度日冕等离子体的非均匀扫描提供的。这些扰动的空间尺度（对于Al为约0.5mm，对于W为约0.25mm）由线芯的尺寸（对于Al为约0.25mm，对于W为约0.1mm）确定。当金属丝间隙与金属丝芯尺寸之比减小到约3时，观察到Al阵列内爆动力学发生了质的变化，并向类0D轨迹过渡。
We present the first measurements by x-ray radiography of the development of instabilities during the implosion phase of wire array Z pinches. The seeding of perturbations on the dense core of each wire is provided by nonuniform sweeping of the low-density coronal plasma from the cores by the global JxB force. The spatial scale of these perturbations ( approximately 0.5 mm for Al and approximately 0.25 mm for W) is determined by the size of the wire cores ( approximately 0.25 mm for Al and approximately 0.1 mm for W). A qualitative change in implosion dynamics, with transition to 0D-like trajectory, was observed in Al arrays when the ratio of interwire gap to wire core size was decreased to approximately 3.