Characteristics of wall sheath and secondary electron emission under different electron temperatures in a Hall thruster  

作　　者：段萍 覃海娟 周新维 曹安宁 陈龙 高宏 

机构地区：[1]Department of Physics,Dalian Maritime University [2]School of Physics and Optoelectronic Technology,Dalian University of Technology

出　　处：《Chinese Physics B》2014年第7期510-515,共6页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.10975026,11275034,and 11175052);the Key Project of Science andTechnology of Liaoning Province,China(Grant No.2011224007);the Fundamental Research Funds for the Central Universities of Ministry of Educationof China(Grant No.3132014328)

摘　　要：In this paper, a two-dimensional physical model is established in a Hall thruster sheath region to investigate the influences of the electron temperature and the propellant on the sheath potential drop and the secondary electron emission in the Hall thruster, by the particle-in-cell （PIC） method. The numerical results show that when the electron temperature is relatively low, the change of sheath potential drop is relatively large, the surface potential maintains a stable value and the stability of the sheath is good. When the electron temperature is relatively high, the surface potential maintains a persistent oscillation, and the stability of the sheath reduces. As the electron temperature increases, the secondary electron emission coefficient on the wall increases. For three kinds of propellants （At, Kr, and Xe）, as the ion mass increases the sheath potentials and the secondary electron emission coefficients reduce in sequence.In this paper, a two-dimensional physical model is established in a Hall thruster sheath region to investigate the influences of the electron temperature and the propellant on the sheath potential drop and the secondary electron emission in the Hall thruster, by the particle-in-cell （PIC） method. The numerical results show that when the electron temperature is relatively low, the change of sheath potential drop is relatively large, the surface potential maintains a stable value and the stability of the sheath is good. When the electron temperature is relatively high, the surface potential maintains a persistent oscillation, and the stability of the sheath reduces. As the electron temperature increases, the secondary electron emission coefficient on the wall increases. For three kinds of propellants （At, Kr, and Xe）, as the ion mass increases the sheath potentials and the secondary electron emission coefficients reduce in sequence.

关 键 词：Hall thruster electron temperature SHEATH secondary electron emission 

分 类 号：O462.1[理学—电子物理学]