Impact of azimuthal magnetic field inhomogeneity on Hall thruster high-frequency azimuthal instability via 2D radial–azimuthal PIC simulations
Year: 2025
Type: article
Abstract: For the SPT-type Hall thrusters, the magnetic structure with magnetic conductive columns leads inherent to azimuthally inhomogeneous magnetic configurations. This azimuthal magnetic inhomogeneity may impact electron azimuthal closed-drift motion and cross-field transport characteristics. This study systematically investigates the effects of azimuthal magnetic field gradient on high-frequency azimuthal instability and associated anomalous electron transport through 2D radial–azimuthal particle-in-cell simulations. The results reveal dual mechanisms of magnetic inhomogeneity on electron cyclotron drift instability (ECDI) characteristics: (1) the azimuthal drift velocity distribution becomes modulated by the magnetic field inhomogeneity, with increased average drift velocity enhancing ECDI intensity under stronger inhomogeneity; (2) simultaneously, the ECDI wavenumber spectrum broadens with elevated magnetic inhomogeneity, reducing discrete ECDI spectral peaks. Under the dual influence of magnetic field inhomogeneity, when the inhomogeneity level is below 5%, the ECDI saturation amplitude and electron cross-field mobility vary less. However, a notable reduction of 13.4% in ECDI saturation intensity and a 17.4% decrease in electron mobility are observed when magnetic field inhomogeneity reaches 10%.
Authors: Zhijun Zhou, Xin Luo, Yinjian Zhao, Daren Yu
Institutions: Harbin Institute of Technology, Harbin Engineering University
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
Award: G5903320848
OpenAlex ID: W4414460948