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首页> 外文会议>2013 Abstracts IEEE International Conference on Plasma Science >Experimental and numerical study of a wire-explosion-pos plasma dynamics
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Experimental and numerical study of a wire-explosion-pos plasma dynamics

机译：线爆炸式等离子体动力学的实验和数值研究

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摘要

We study possibility to design fast current switch using wire explosion. It was carried out series of experiments on explosion of single wire connecting two coaxial cylindrical electrodes. Current with the amplitude value of 80 kA and rise time of 7 μs flowing through the 4-μm tungsten wire. The outer magnetic field (up to 30 kG) was directed along the electrodes. Setup design allow to us to change the amplitude of current flowing between the electrodes and to measure the total resistance of interelectrode volume. So we can study PPT plasma dynamics at different currents (current amplitude is changed in range of 10–80 kA, current rise rate is changed in range of 109−1010 A/s) and magnetic field. We compare experimental data with results of simulations carried out by means of the 3D radiative magnetohydro dynamic code MARPLE3D (KIAM RAS). We simulate (i) a stage of a wire explosion and plasma stirring in the inter-electrode gap, and (ii) a stage of a plasma switch performance. Numerical simulations allow to estimate a time we need to fill the volume between the coaxial electrodes with the plasma generated from the wire and switch inhomogeneity, and to study the switch dynamics dependence on the hydromagnetic instability as well as the Hall effect. The calculated switch evolution correlates with experimental data.
机译：我们研究使用线爆炸设计快速电流开关的可能性。对连接两个同轴圆柱电极的单线爆炸进行了一系列实验。振幅值为80 kA，上升时间为7μs的电流流过4μm钨丝。沿电极引导外部磁场（最高30 kG）。设置设计使我们能够改变电极之间流动的电流幅度，并测量电极间体积的总电阻。因此，我们可以研究不同电流下的PPT等离子体动力学（电流幅度在10–80 kA范围内变化，电流上升速率在10 9 −10 10 范围内变化A / s）和磁场。我们将实验数据与通过3D辐射磁流体动力学代码MARPLE3D（KIAM RAS）进行的仿真结果进行比较。我们模拟（i）电极间间隙中的导线爆炸和等离子体搅拌阶段，以及（ii）等离子体开关性能阶段。数值模拟可以估算出我们需要用导线产生的等离子体填充同轴电极之间的体积以及开关不均匀的时间，并且可以研究开关动力学对水磁不稳定性以及霍尔效应的依赖性。计算出的开关演变与实验数据相关。

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