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arXiv 2007.13806physics.plasm-ph
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强耦合碰撞复杂等离子体中的离子漂移不稳定性

Ion drift instability in a strongly coupled collisional complex plasma

Sergey Khrapak, Victoria Yaroshenko

摘要:

本文研究了漂移离子碰撞复杂等离子体中与重粒子有关的低频波模及其不稳定性。讨论了离子漂移对该模式的声速的影响。不稳定性的一般条件推导出亚热离子漂移,考虑到强耦合的粒子组件。强耦合效应降低了离子的声速,有利于离子漂移不稳定性的发生。一个宽的参数范围被认为是从弱碰撞到强碰撞制度的离子和粒子成分。选定的等离子体参数对目前在国际空间站上运行的PK-4实验具有代表性。

英文摘要:

We investigate the low-frequency wave mode associated with heavy particles and its instability in a collisional complex plasma with drifting ions. The effect of the ion drift on the sound velocity of this mode is discussed. The general condition of the instability is derived for subthermal ion drifts, taking into account strong coupling of the particle component. As a general tendency, strong coupling effects reduce the sound velocity and facilitate the occurrence of the ion drift instability. A wide parameter range is considered from the weakly collisional to strongly collisional regimes for the ion and particle components. The chosen plasma parameters are representative to the PK-4 experiment, currently operational on board the International Space Station.

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