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arXiv 2107.09368physics.plasm-ph
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非线性离子声波中离子和通量的分离

The separation of ions and fluxes in nonlinear ion-acoustic waves

A. E. Dubinov, I. N. Kitayev, D. Y. Kolotkov

摘要:

天然或实验室来源的多物种等离子体通常被认为是非线性离子声波的宿主。我们提出了由多个离子种群,电子和尘埃等离子体中的非线性离子声波引起的离子通量的计算。以下等离子体模型被认为是:一个电子-离子等离子体与冷离子,一个双离子等离子体与两种类型的温暖的带正电荷的离子,和尘埃双离子等离子体。结果表明,在电子-离子等离子体中,波致离子流与非线性离子声波的相速方向相反。在双离子等离子体中,离子声波有快波和慢波两种模式。在非线性快离子声波中,两种离子的通量被发现是共同指向的,并且逆着波漂移。在慢波中,离子的非线性通量指向相反的方向。这一结果证明了利用这些非线性波诱导的离子流来有效分离等离子体中的离子的可能性。在尘埃双离子等离子体中,慢离子声波的超非线性机制可以强化离子分离过程。

英文摘要:

The multi-species plasma of natural or laboratory origin is often considered to host nonlinear ion-acoustic waves. We present calculations of ion fluxes induced by nonlinear ion-acoustic waves in a plasma consisting of multiple ion populations, electrons, and dust. The following plasma models are considered: an electron-ion plasma with cold ions, a bi-ion plasma with two types of warm positively charged ions, and a dusty bi-ion plasma. It is found that in the electron-ion plasma, the wave-induced ion flux is directed oppositely to the phase speed of the nonlinear ion-acoustic wave. In the bi-ion plasma, there are two modes of ion-acoustic waves which are fast and slow waves. In the nonlinear fast ion-acoustic wave, the fluxes of both types of ions are found to be co-directed and drift against the wave. In a slow wave, the nonlinear fluxes of ions are directed in opposite directions. This result demonstrates the possibility to use these nonlinear wave-induced ion fluxes for effective separation of ions in the plasma. In a dusty bi-ion plasma, the ion separation process can be intensified by a super-nonlinear regime of slow ion-acoustic waves.

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