Yang San-Xiang; Zhao Yi-De; Dai Peng; Li Jian-Peng; Geng Hai; Yang Jun-Tai; Jia Yan-Hui; Guo Ning

doi:10.7498/aps.73.20241331

Abstract

As one of the key design parameters of Hall thruster, magnetic field indirectly influences the macroscopic performance of the thruster by directly affecting electron transport, neutral atom ionization, plasma distribution and other microscopic behaviors. At present, the research on the influence of Hall thruster’s magnetic field focuses mostly on the size and distribution of the magnetic field in the discharge channel, but less on the influence of the plume magnetic field on the thruster. Based on this, the effect of plume region axial magnetic field profile on the performance of Hall thruster is studied by using two-dimensional hybrid simulation. The research results show that the axial magnetic field gradient in the plume region has a significant influence on the thruster performance, when the magnetic field characteristics (magnetic field topology and magnetic field intensity) in the discharge channel remain unchanged. The potential drop in the discharge channel decreases with the axial magnetic field gradient in the plume region decreasing. However, the electric field in the plume region and the peak ion number density in the discharge channel increase with the axial magnetic field gradient in the plume region decreasing. Overall, the performance of the thruster is improved by increasing the magnetic field strength in the plume region. More specifically, there is a critical value of axial magnetic field gradient in the plume region. When the axial magnetic field gradient in the plume region is greater than the critical value, the thrust increases with the axial magnetic field gradient decreasing. When the axial magnetic field gradient of the plume region is less than the critical value, the thrust decreases slightly with the axial magnetic field gradient decreasing. The comparison of plasma potential, electric field, ion number density, and ionization rate distribution under different magnetic field distributions in the plume region shows that the effect of plume magnetic field on thrust is to affect the spatial electric field distribution by affecting the mobility of electrons, thus causing the thrust to change due to electric field. The research results of this paper will provide theoretical support for improving the performance of hall thrusters and designing magnetic fields.

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Corresponding author: Geng Hai, marineen115@163.com

Funds: Project supported by the National Key R&D Program of China (Grant No. 2021YFC2202704), the National Natural Science Foundation of China (Grant No. 62201238), the Outstanding Youth Fund of Gansu Province, China (Grant No. 21JR7RA744), and the Natural Science Foundation of Gansu Province, China (Grant Nos. 22JR5RA789, 22JR5RA787).

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Vol. 73, Issue 24 - 2024-12-20

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