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首页> 外文期刊>Plasma physics and controlled fusion >Fluid theory and simulations of instabilities, turbulent transport and coherent structures in partially-magnetized plasmas of E x B discharges
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Fluid theory and simulations of instabilities, turbulent transport and coherent structures in partially-magnetized plasmas of E x B discharges

机译：e×B放电部分磁化等离子体中的流体理论和仿真，湍流运输和相干结构

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摘要

Partially-magnetized plasmas with magnetized electrons and non-magnetized ions are common in Hall thrusters for electric propulsion and magnetron material processing devices. These plasmas are usually in strongly non-equilibrium state due to presence of crossed electric and magnetic fields, inhomogeneities of plasma density, temperature, magnetic field and beams of accelerated ions. Free energy from these sources make such plasmas prone to various instabilities resulting in turbulence, anomalous transport, and appearance of coherent structures as found in experiments. This paper provides an overview of instabilities that exist in such plasmas. A nonlinear fluid model has been developed for description of the Simon-Hoh, lower-hybrid and ion-sound instabilities. The model also incorporates electron gyroviscosity describing the effects of finite electron temperature. The nonlinear fluid model has been implemented in the BOUT++ framework. The results of nonlinear simulations are presented demonstrating turbulence, anomalous current and tendency toward the formation of coherent structures.
机译：带有磁化电子和非磁化离子的部分磁化等离子体在用于电力推进和磁控管材料处理设备的霍尔推进器中很常见。由于交叉电场和磁场的存在、等离子体密度、温度、磁场和加速离子束的不均匀性，这些等离子体通常处于强非平衡状态。来自这些源的自由能使这种等离子体容易发生各种不稳定性，从而导致湍流、反常输运和实验中发现的相干结构的出现。本文概述了这种等离子体中存在的不稳定性。建立了一个非线性流体模型来描述Simon Hoh、低杂波和离子声不稳定性。该模型还结合了描述有限电子温度影响的电子回旋粘度。非线性流体模型已在BOUT++框架中实现。非线性模拟的结果显示了湍流、反常电流和形成相干结构的趋势。

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