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| 1 | Growth mechanism and characteristics of electron drift instability in Hall thruster with different propellant types显示文摘The existence of a significant electron drift instability(EDI) in the Hall thruster is considered as one of the possible causes of the abnormal increase in axial electron mobility near the outlet of the channel. In recent years, extensive simulation research on the characteristics of EDI has been conducted, but the excitation mechanism and growth mechanism of EDI in linear stage and nonlinear stage remain unclear. In this work, a one-dimensional PIC model in the azimuthal direction of the thruster near-exit region is established to gain further insights into the mechanism of the EDI in detail, and the effects of different types of propellants on EDI characteristics are discussed. The changes in axial electron transport caused by EDI under different types of propellants and electromagnetic field strengths are also examined. The results indicate that EDI undergoes a short linear growth phase before transitioning to the nonlinear phase and finally reaching saturation through the ion Landau damping. The EDI drives a significant ion heating in the azimuthal direction through electron–ion friction before entering the quasi-steady state, which increases the axial mobility of the electrons. Using lighter atomic weight propellant can effectively suppress the oscillation amplitude of EDI, but it will increase the linear growth rate, frequency, and phase velocity of EDI. Compared with the classical mobility, the axial electron mobility under the EDI increases by three orders of magnitude, which is consistent with experimental phenomena. The change of propellant type is insufficient to significantly change the axial electron mobility. It is also found that the collisions between electrons and neutral gasescan significantly affect the axial electron mobility under the influence of EDI, and lead the strength of the electric field to increase and the strength of the magnetic field to decrease, thereby both effectively suppressing the axial transport of electrons. | 陈龙 阚子晨 高维富 段萍 陈俊宇 檀聪琦 崔作君 | 2024 | Chinese Physics B2024，33，1： | 0 |
| 2 | 霍尔推力器放电通道中性气体分布及检测技术研究进展显示文摘中性气体是霍尔推力器放电过程的重要组成部分,通道内气体密度分布是霍尔推力器优化的重要参数。为了提升霍尔推力器内部气体均匀性,对国内外研究进展进行了综述,详细分析了气体分配器供气方式、出气小孔径向位置、放电通道长度和宽度等因素对气体分布均匀性的影响,并概述了霍尔推力器放电通道内部中性气体分布检测方法。对各影响因素及检测方法进行了初步讨论,提出了改善霍尔推力器内部气体分布均匀性值得研究的问题和方向。 | 罗威 龙建飞 徐禄祥 柏树 孙明明 王嘉彬 | 2023 | 固体火箭技术2023，46，1： | 0 |
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