Theory for the anomalous electron transport in Hall effect thrusters. II. Kinetic model
Theory for the anomalous electron transport in Hall effect thrusters. II. Kinetic model
复制标题
霍尔效应推进器中的反常电子传输理论。
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
P. Chabert
中科院分区：
文献类型：
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作者：
T. Lafleur;T. Lafleur;S. Baalrud;P. Chabert
在论文I [T]。Lafleur et al.，物理学。等离子体23,053502(2016)]，我们证明了（使用粒子在细胞中的模拟）霍尔效应推力器（HETs）中异常高的跨场电子传输与导致电子散射增强的方位静电不稳定性之间存在明确的相关性。在这里，我们提出了一个动力学理论，该理论预测了增强的散射率，并提供了与实验很好地一致的电子跨场迁移率。由于离子波捕获和波对流的结合，高温超导中的大方位电子漂移速度驱动了强烈的不稳定性，这种不稳定性很快饱和，导致迁移率比经典扩散理论预期的要高许多个数量级。除了磁场强度B0之外，这种增强的迁移率是等离子体特性（如等离子体密度）的强烈函数，因此通常不遵循简单的1/B02或1/B0标度定律。
In Paper I [T. Lafleur et al., Phys. Plasmas 23, 053502 (2016)], we demonstrated (using particle-in-cell simulations) the definite correlation between an anomalously high cross-field electron transport in Hall effect thrusters (HETs), and the presence of azimuthal electrostatic instabilities leading to enhanced electron scattering. Here, we present a kinetic theory that predicts the enhanced scattering rate and provides an electron cross-field mobility that is in good agreement with experiment. The large azimuthal electron drift velocity in HETs drives a strong instability that quickly saturates due to a combination of ion-wave trapping and wave-convection, leading to an enhanced mobility many orders of magnitude larger than that expected from classical diffusion theory. In addition to the magnetic field strength, B0, this enhanced mobility is a strong function of the plasma properties (such as the plasma density) and therefore does not, in general, follow simple 1/B02 or 1/B0 scaling laws.