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Effect of preionization in Aton-type Hall thruster on low frequency oscillation

机译：Aton型霍尔推力器中的预电离对低频振荡的影响

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It was found through the experiments made with an Aton-type Hall thruster that some of the propellant was ionized in the buffer chamber by "quick electrons." This ionization is called "preionization" to discriminate it from the ionization in the discharge channel. The effect of preionization on low frequency oscillation was experimentally studied by changing the electric field intensity in the buffer chamber. The relationship between low frequency oscillation and preionization ratio was investigated through numerical simulation using a one-dimensional quasineutrality hydrodynamic model. The results obtained indicate that the amplitude of low frequency oscillation decreases as the preionization ratio increases. It was found through the analysis and numerical simulation of the physical process of low frequency oscillation that the positive feedback of electron density was the main cause of low frequency oscillation. The increase of preionization ratio decreases the amplitude of the feedback variation thereby reducing the amplitude of low frequency oscillation. (C) 2008 American Institute of Physics.
机译：通过使用Aton型霍尔推力器进行的实验发现，某些推进剂在缓冲室中被“快速电子”电离。将该电离称为“预电离”以将其与放电通道中的电离区分开。通过改变缓冲室内的电场强度，实验研究了预电离对低频振荡的影响。利用一维准中性水动力模型，通过数值模拟研究了低频振荡与预电离比之间的关系。所得结果表明，低频振荡的幅度随着预电离率的增加而减小。通过对低频振荡的物理过程的分析和数值模拟发现，电子密度的正反馈是低频振荡的主要原因。预电离率的增加减小了反馈变化的幅度，从而减小了低频振荡的幅度。 （C）2008美国物理研究所。

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