首页|Growth mechanism and characteristics of electron drift instability in Hall thruster with different propellant types

Growth mechanism and characteristics of electron drift instability in Hall thruster with different propellant types

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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.

Hall thrusterelectron drift instabilityaxial electron mobilityparticle-in-cell simulation

陈龙、阚子晨、高维富、段萍、陈俊宇、檀聪琦、崔作君

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School of Science,Dalian Maritime University,Dalian 116026,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaFundamental Research Funds for the Central Universities

11975062116050213132023192

2024

10.1088/1674-1056/acf9e5

中国物理B(英文版)
中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI
影响因子：0.995
ISSN：1674-1056
年,卷(期)：2024.33(1)
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