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Physics of wire array Z-pinch implosions: experiments at Imperial College

机译：线阵列Z捏内爆的物理：帝国理工学院的实验

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摘要

A review of recent experiments on the MAGPIE generator (1 MA, 250 ns) aimed at studying the implosion dynamics of wire array Z-pinches is presented. The first phase of implosion is dominated by the gradual ablation of stationary wire cores and gradual redistribution of the array mass by the precursor plasma flow. It is found that the rate of wire ablation depends on the magnitude of the global (collective) magnetic field of the array, and increases with the field. The existence of the modulation of the ablation rate along the wires leads to the presence of a 'trailing' mass left behind by the imploding current sheath. The trailing mass provides an alternative path for the current, reducing the force available for compression of the pinch at stagnation. The observed dependence of the ablation rate on inter-wire separation suggests an explanation for the existence of the optimal wire number maximizing the x-ray power. Axially resolved spectroscopy shows the presence of the x-ray 'bright' spots (< 150 mu m) emitting intense continuum radiation.
机译：提出了有关MAGPIE发生器（1 MA，250 ns）的最新实验的综述，旨在研究线阵列Z夹点的内爆动力学。内爆的第一阶段主要是固定丝芯的逐渐消融和前体等离子体流对阵列质量的逐渐重新分布。已经发现，线烧蚀的速率取决于阵列的整体（集体）磁场的大小，并随磁场的增加而增加。沿着导线的烧蚀速率的调制的存在导致存在由内部电流护套留下的“拖尾”质量的存在。尾随质量为电流提供了另一条路径，从而减少了停滞时可用于压缩捏的力。所观察到的烧蚀速率对线间分离的依赖性为存在使X射线功率最大化的最佳线数提供了解释。轴向分辨光谱显示存在X射线“亮”点（<150微米），发出强烈的连续辐射。

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