This work presents the results of experimental and theoretical research of impact of tailored density profile and application of external axial magnetic field on initial spatial distribution of the plasma density in the plasma metal puff Z-pinch and on its implosion dynamics. It has been discovered that upon implosion of the plasma metal puff Z-pinch some stripes interpreted as the system of two coaxial shells appear on the optical images. With the help of numerical simulation, the formation of the plasma liner consisting of a mixture of carbon and bismuth ions and formed by the expansion of the plasma jet of the arc burning on the bismuth electrode has been considered in this work. It has been shown that the lightweight carbon ions facilitate formation of the density distribution smoothly decreasing with the increase in radius, that, in turn, leads to suppression of the Rayleigh–Taylor instability in the current sheath upon further implosion. It has also been demonstrated that availability of the two types of ions in plasma considerably different in mass leads to formation (in the compression phase) of a double shell with externally located heavy ions. It has also been revealed that the application of the external axial magnetic field leads to reduction in the plasma metal puff Z-pinch initial diameter.

中文翻译：

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等离子金属粉扑 Z 形夹头内爆过程中双壳的形成

这项工作展示了定制密度分布和外部轴向磁场的应用对等离子体金属粉扑 Z 夹点中等离子体密度的初始空间分布及其内爆动力学的影响的实验和理论研究结果。已经发现，在等离子金属粉团 Z 型收缩内爆时，一些条纹被解释为两个同轴壳的系统出现在光学图像上。在数值模拟的帮助下，本文考虑了由铋电极上电弧燃烧的等离子体射流膨胀形成的由碳和铋离子的混合物组成的等离子体衬里的形成。已经表明，轻质碳离子促进密度分布的形成，随着半径的增加而逐渐减小，反过来，导致在进一步内爆时抑制当前护套中的瑞利-泰勒不稳定性。还已经证明，等离子体中质量显着不同的两种类型离子的可用性导致形成（在压缩阶段）具有位于外部的重离子的双壳层。还揭示了外部轴向磁场的应用导致等离子体金属粉扑Z-pinch初始直径的减小。