›› 2014, Vol. 23 ›› Issue (7): 75203-075203.doi: 10.1088/1674-1056/23/7/075203

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇    下一篇

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

段萍a, 覃海娟a, 周新维a, 曹安宁a, 陈龙b, 高宏a   

  1. a Department of Physics, Dalian Maritime University, Dalian 116026, China;
    b School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China
  • 收稿日期:2013-06-04 修回日期:2013-12-23 出版日期:2014-07-15 发布日期:2014-07-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 10975026, 11275034, and 11175052), the Key Project of Science and Technology of Liaoning Province, China (Grant No. 2011224007), and the Fundamental Research Funds for the Central Universities of Ministry of Education of China (Grant No. 3132014328).

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

Duan Ping (段萍)a, Qin Hai-Juan (覃海娟)a, Zhou Xin-Wei (周新维)a, Cao An-Ning (曹安宁)a, Chen Long (陈龙)b, Gao Hong (高宏)a   

  1. a Department of Physics, Dalian Maritime University, Dalian 116026, China;
    b School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China
  • Received:2013-06-04 Revised:2013-12-23 Online:2014-07-15 Published:2014-07-15
  • Contact: Duan Ping E-mail:duanping591@sohu.com
  • About author:52.40.Kh; 52.65.-y
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 10975026, 11275034, and 11175052), the Key Project of Science and Technology of Liaoning Province, China (Grant No. 2011224007), and the Fundamental Research Funds for the Central Universities of Ministry of Education of China (Grant No. 3132014328).

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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 (Ar, 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

Abstract: 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 (Ar, Kr, and Xe), as the ion mass increases the sheath potentials and the secondary electron emission coefficients reduce in sequence.

Key words: Hall thruster, electron temperature, sheath, secondary electron emission

中图分类号:  (Plasma sheaths)

  • 52.40.Kh
52.65.-y (Plasma simulation)