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arXiv 1702.07152physics.plasm-ph
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流动等离子体中尾流的碰撞诱导放大

Collision induced amplification of wakes in streaming plasmas

Sita Sundar, Hanno Kählert, Jan-Philip Joost, Patrick Ludwig, Michael Bonitz

摘要:

这项工作探讨了形成的尾场所造成的离子流周围的带电尘埃粒子,使用三维粒子在细胞(PIC)模拟与电荷中性碰撞。详细研究了外加驱动电场对离子非麦克斯韦分布的影响。非麦克斯韦离子形成的尾流特征表现出显着的偏离内观察到的移位麦克斯韦分布的模型。在很宽的流动速度(马赫数)范围内,分析了尾流势的峰值振幅和位置对碰撞程度的依赖关系。与离子的移位麦克斯韦分布相反,漂移驱动的非麦克斯韦分布表现出随着高流动速度的碰撞性的增加,第一吸引峰的尾振幅增加。在非常低的马赫数,碰撞诱导放大观察麦克斯韦以及非麦克斯韦分布。

英文摘要:

This work examines the formation of wake fields caused by ions streaming around a charged dust particle, using three-dimensional particle-in-cell (PIC) simulations with charge-neutral collisions included. The influence of an external driving electric field, which leads to a non-Maxwellian distribution of ions, is investigated in detail. The wake features formed for non-Maxwellian ions exhibit significant deviations from those observed within the model of a shifted Maxwellian distribution. The dependence of the peak amplitude and position of the wake potential upon the degree of collisionality is analyzed for a wide range of streaming velocities (Mach numbers). In contrast to a shifted Maxwellian distribution of ions, the drift-driven non-Maxwellian distribution exhibits an increase of the wake amplitude of the first attractive peak with increase in collisionality for high streaming velocities. At very low Mach numbers, collision-induced amplification is observed for Maxwellian as well as non-Maxwellian distributions.

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