Abstract

The results of the studies of the compression of the plasma of cone-cylindrical nested arrays of mixed composition at current flow through them of up to 3 MA at the Angara-5-1 facility are presented. The outer array of the nested array is a conical array of thin nylon fibers or tungsten wires, while the inner one is a cylindrical tungsten wire array. The implosion of current in this type of nested arrays is a unique opportunity for simulating the interaction of magnetized plasma flows with a strong magnetic field. In the space between the inner and outer arrays, the super-Alfvén plasma flow from the outer array collides with the magnetic field of the discharge current through the inner array. As a result of this interaction in the space between arrays, different plasma flow modes are implemented: pre-Alfvén (V_r < V_А), super-Alfvén (V_r > V_А), and a mode with the formation of the transition region—a shock wave (SW) between arrays, depending on the ratio of the plasma formation rates of arrays of nested array and on the ratio of their radii. The SW region formation in the space between arrays occurs near the inner array, where the kinetic pressure of the plasma flow from the outer array is balanced by the magnetic pressure of the discharge current of the inner array. New experimental data was obtained on the features of the SW region formation near the surface of the inner array and the nature of its change during the interaction. The use of an external conical array enabled us to obtain the SW position depending on the ratio of radii of the outer and inner arrays in one shot. It is shown that the interaction of plasma flows of the outer conical array with the magnetic field of the inner cylindrical array leads to a significant decrease in the zipper-effect at the final stage of plasma compression of the inner array and the pinch formation. The obtained experimental results are compared with the results of simulating the plasma motion between the arrays using the three-dimensional radiation-magnetohydrodynamic code MARPLE3D.

中文翻译：

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圆锥圆柱嵌套阵列内爆过程中等离子体流与磁场相互作用的研究

摘要

提出了在Angara-5-1设施中，当混合成分的圆锥圆柱嵌套阵列的电流流过高达3 MA时，其血浆压缩的研究结果。嵌套阵列的外部阵列是细尼龙纤维或钨丝的圆锥形阵列，而内部阵列是圆柱形钨丝阵列。此类嵌套阵列中的电流内爆是模拟磁化等离子体流与强磁场相互作用的独特机会。在内部和外部阵列之间的空间中，来自外部阵列的超Alfvén等离子体流与通过内部阵列的放电电流的磁场发生碰撞。由于阵列之间空间中的这种相互作用，实现了不同的等离子体流动模式：pre-Alfvén（V_[R < V _А），超阿尔芬（ V _{- [R} > V _А）和形成过渡区域的模式-阵列之间的冲击波（SW），取决于嵌套阵列的阵列的等离子体形成速率的比率及其半径的比率。阵列之间的空间中的SW区域形成在内部阵列附近发生，其中来自外部阵列的等离子体流的动压由内部阵列的放电电流的磁压力平衡。获得了有关内部阵列表面附近SW区形成的特征及其在相互作用过程中变化性质的新实验数据。使用外部圆锥形阵列使我们能够根据一次射击中外部阵列和内部阵列的半径之比来获得SW位置。结果表明，外部圆锥阵列的等离子体流与内部圆柱阵列的磁场的相互作用导致内部阵列的等离子体压缩和收缩形成的最后阶段的拉链效应显着降低。将获得的实验结果与使用三维辐射-磁流体动力学代码MARPLE3D模拟阵列之间的等离子体运动的结果进行比较。