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Numerical study of azimuthal sheath structure and asymmetric anomalous erosion in a stationary plasma thruster

Published online by Cambridge University Press:  29 March 2019

Hui Liu ,
Xiang Niu  and
Da-Ren Yu
Hui Liu*
Affiliation:
Laboratory of Plasma Propulsion, Harbin Institute of Technology, Harbin 150001, China
Xiang Niu
Affiliation:
Laboratory of Plasma Propulsion, Harbin Institute of Technology, Harbin 150001, China
Da-Ren Yu
Affiliation:
Laboratory of Plasma Propulsion, Harbin Institute of Technology, Harbin 150001, China
*
†Email address for correspondence: [email protected]
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Abstract

The influence of the azimuthal electron drift on anomalous erosion and the sheath profile in a stationary plasma thruster (SPT) is analysed in this article. It is found that the anomalous erosion has a self-organized structure, which is formed by the interaction between the plasma and the ceramic walls. In order to interpret the mechanism of the azimuthal erosion structure, a particle in cell (PIC) model is developed to simulate the azimuthal sheath. The results show that the electron azimuthal Hall drift due to crossed electric and magnetic field plays a key role in the azimuthal erosion evolution process. Electron Hall drift can generate an asymmetric sheath structure and induce azimuthal sheath oscillation. Furthermore, an asymmetric sheath caused by the integrated effect of the azimuthal irregular wall structure and azimuthal Hall drift will result in the azimuthal movement of ions. Based on the sheath simulated results, an erosion model is used to simulate the azimuthal erosion evolution. An asymmetric erosion profile caused by the azimuthal asymmetric ion sputtering is found.

Keywords

plasma devicesplasma simulationplasma sheaths
Type
Research Article
Information
Journal of Plasma Physics , Volume 85 , Issue 2 , April 2019 , 905850208
Copyright
© Cambridge University Press 2019 

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