Transformation of a tungsten wire to the plasma state by nanosecond electrical explosion in vacuum.
Transformation of a tungsten wire to the plasma state by nanosecond electrical explosion in vacuum.
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DOI：
10.1103/physreve.77.056406
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发表时间：
2008-05
期刊：
影响因子：
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通讯作者：
G. Sarkisov;S. Rosenthal;K. Struve
中科院分区：
文献类型：
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作者：
G. Sarkisov;S. Rosenthal;K. Struve
实验证明，在真空纳秒电爆炸过程中，首次通过焦耳加热将钨丝芯直接转变为等离子体状态。在最初的大约10 ns内，大约130 eV/原子的能量被沉积到涂有2微米聚酰亚胺的12微米W线中。所有的金属都迅速转变为高度电离的等离子体，而周围的聚酰亚胺涂层主要保持在气态。这种涂层完全抑制了电晕的形成。线的膨胀速度约为12-18公里/S，50 ns的平均线电离率约为67%，相应的LTE温度约为1.2 eV。裸露W丝的爆炸表明，由于分流电晕的产生，线芯加热提前终止。磁流体动力学(MHD)模拟再现了涂层和非涂层钨丝爆炸的主要特征。
Experiment demonstrates the first direct transformation of a tungsten wire core to the plasma state by Joule heating during nanosecond electrical explosion in vacuum. Energy of approximately 130 eV/atom was deposited into the 12 microm W wire coated by 2 microm polyimide during the first approximately 10 ns. All the metal rapidly transformed to highly ionized plasma, while the surrounding polyimide coating remained primarily in a gaseous state. This coating totally suppressed corona formation. The expansion velocity of the wire was approximately 12-18 km/s, the average wire ionization at 50 ns reached approximately 67% with corresponding LTE temperature of approximately 1.2 eV . Explosion of bare W wire demonstrated earlier termination of the wire core heating due to shunting corona generation. Magnetohydrodynamic (MHD) simulation reproduces the main features of coated and uncoated W wire explosion.