| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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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 |
a Department of Physics, Dalian Maritime University, Dalian 116026, China;
b School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China |
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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.
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Received: 04 June 2013
Revised: 23 December 2013
Accepted manuscript online:
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PACS:
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52.40.Kh
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(Plasma sheaths)
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52.65.-y
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(Plasma simulation)
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| Fund: 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). |
Corresponding Authors:
Duan Ping
E-mail: duanping591@sohu.com
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| About author: 52.40.Kh; 52.65.-y |
Cite this article:
Duan Ping (段萍), Qin Hai-Juan (覃海娟), Zhou Xin-Wei (周新维), Cao An-Ning (曹安宁), Chen Long (陈龙), Gao Hong (高宏) Characteristics of wall sheath and secondary electron emission under different electron temperatures in a Hall thruster 2014 Chin. Phys. B 23 075203
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