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arXiv 0910.2403physics.plasm-phphysics.space-ph
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多流体和动力学等离子体描述中电流驱动的反常输运:反常输运能级的模拟研究

The current-driven anomalous transports in multi-fluid and kinetic plasma descriptions: A simulation study of anomalous transport levels

Kuang Wu Lee, Joerg Buechner

摘要:

在大多数流体模型中,反常输运的产生机制和磁化体通常被视为模型描述之外的辅助项,可以自由操作,反常输运实际上是多流体系统中显著的自生效应。将电流弛豫水平与相同初始设置的动力学Vlasov模拟进行比较,发现多流体等离子体中存在更高的异常输运,即对于相同设置,多流体模拟中的电流降低比动力学Vlasov模拟中的电流降低更强。为了分离导致不同异常输运能级的机制,我们通过对所产生的波进行频谱分析,结合不同时刻的空间平均分布,研究了详细的波粒相互作用。结果表明,当电子漂移速度低于波的相速度时,动力学模拟中的朗道阻尼起着稳定等离子体漂移系统的作用。当电子之间的相对漂移速度仍然很高时,电流弛豫过程停止。

英文摘要:

In most fluid models the generation mechanism and the magnetide of anomalous transport are usually treated as auxiliary terms external to the model description and are free to manipulate, the anomalous transport is indeed a noticeably self-generated effect exhibited in a multi-fluid system. Comparing the current relaxation levels with kinetic Vlasov simulation of the same initial setups, it's found that there is a higher anomalous transport in the multi-fluid plasma, i.e. a stronger current reduction in the multi-fluid simulation than in the kinetic Vlasov simulation for the same setup. To isolate the mechanism that causes the different anomalous transport levels, we hence investigated the detailed wave-particle interaction by using spectrum analysis of the generated waves, combined with a spatial-averaged distributions at different instants. It shows that the Landau damping in kinetic simulation takes a role that stablizes the plasma-drifting system, when the bulk veliocity of electron drifts drop beneath the phase velocity of waves. The current relaxation process stops while the relative drift velocity between electrons is still high.

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