The evolution of magnetic tower jets in the laboratory
The evolution of magnetic tower jets in the laboratory
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DOI：
10.1063/1.2436479
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发表时间：
2007-05-01
影响因子：
2.2
通讯作者：
Stehle, C.
中科院分区：
文献类型：
--
作者：
Ciardi, A.;Lebedev, S. V.;Stehle, C.
实验室产生的磁射流的演变是通过三维，非理想磁流体动力学模拟数字如下。实验的目的是研究一个纯粹的环形场与扩展的等离子体背景介质的相互作用。系统被观察到演变成一个结构组成的一个近似圆柱形的磁腔与嵌入磁约束射流在其轴上。超音速膨胀产生了一个由上掠的冲击等离子体组成的外壳，它包围并部分限制了磁塔。电流最初沿着腔壁和射流中流动，但电流驱动的不稳定性的发展导致射流的中断以及场和电流的重新排列。空腔的顶部破裂，一个准直良好的、辐射冷却的“clusified”射流从系统中出现。(C)2007年，美国物理学会。
The evolution of laboratory produced magnetic jets is followed numerically through three-dimensional, nonideal magnetohydrodynamic simulations. The experiments are designed to study the interaction of a purely toroidal field with an extended plasma background medium. The system is observed to evolve into a structure consisting of an approximately cylindrical magnetic cavity with an embedded magnetically confined jet on its axis. The supersonic expansion produces a shell of swept-up shocked plasma that surrounds and partially confines the magnetic tower. Currents initially flow along the walls of the cavity and in the jet but the development of current-driven instabilities leads to the disruption of the jet and a rearrangement of the field and currents. The top of the cavity breaks up, and a well-collimated, radiatively cooled, "clumpy" jet emerges from the system. (C) 2007 American Institute of Physics.