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Current channel evolution in ideal Z pinch for general velocity profiles

机译：用于通用速度配置文件的理想Z捏的电流通道演变

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Recent diagnostic advances in gas-puff Z pinches at the Weizmann Institute for the first time allow the reconstruction of the current flow as a function of time and radius. These experiments show an unexpected radially outward motion of the current channel, as the plasma moves radially inward [C. Stollberg, "Investigation of a small-scale self-compressing plasma column," Ph.D. thesis (Weizmann Institute, 2019)]. In this paper, a mechanism that could explain this current evolution is described. We examine the impact of advection on the distribution of current in a cylindrically symmetric plasma. In the case of metric compression, |vr|proportional to r, the current enclosed between each plasma fluid element and the axis is conserved, and so the current profile maintains its shape. We show that for more general velocity profiles, this simple behavior quickly breaks down, allowing for nonconservation of current in a compressing conductor, rapid redistribution of the current density, and even for the formation of reverse currents. In particular, a specific inward radial velocity profile is shown to result in radially outward motion of the current channel, recovering the surprising current evolution discovered at the Weizmann Institute. Published under license by AIP Publishing.
机译：最近在Weizmann Institute第一次捕获Gas-Puff Z捏的诊断前进允许重建当前流量作为时间和半径的函数。这些实验表明了电流通道的意外径向向外运动，因为等离子体径向向内移动[C。 Stollberg，“对小型自压制等离子体柱的调查”，“Ph.D.论文（Weizmann Institute，2019）]。在本文中，描述了一种可以解释该电流演进的机制。我们研究了平流对圆柱对称等离子体中电流分布的影响。在公制压缩的情况下，与R成比例，封闭在每个等离子体流体元件和轴之间的电流是节省的，因此电流轮廓保持其形状。我们表明，对于更多的通用速度配置文件，这种简单的行为很快就崩溃，允许在压缩导体中不提供电流，快速再分布电流密度，甚至用于形成反向电流。特别地，示出了特定的向内径向速度分布，导致电流通道的径向向外运动，恢复在Weizmann研究所发现的令人惊讶的电流演进。通过AIP发布在许可证下发布。

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