Characteristics of a Sheath with Secondary Electron Emission in the Double Walls of a Hall Thruster  

作　　者：段萍 李肸 沈鸿娟 陈龙 鄂鹏 

机构地区：[1]Department of Physics,Dalian Maritime University [2]College of Physics Science and Technology,Dalian University [3]School of Physics and Optoelectronic Technology,Dalian University of Technology [4]Department of Electrical Engineering,Harbin Institute of Technology

出　　处：《Plasma Science and Technology》2012年第9期837-841,共5页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundation of China(Nos.10975026,10875024,11005025,11275034);the Scientific Research Program of the Education Bureau of Liaoning Province,China(No.2009A047);the State Key Development for Basic Research of China(Nos.2009GB105004,2009GB106002)

摘　　要：In order to investigate the effects of secondary electrons, which are emitted from the wall, on the performance of a thruster, a one-dimensional fluid model of the plasma sheath in double walls is applied to study the characteristics of a magnetized sheath. The effects of secondary electron emission （SEE） coefficients and trapping coefficients, as well as magnetic field, on the structure of the plasma sheath are investigated. The results show that sheath potential and wall potential rise with the increment of SEE coefficient and trapping coefficient which results in a reduced sheath thickness. In addition, magnetic field strength will influence the sheath potential distributions.In order to investigate the effects of secondary electrons, which are emitted from the wall, on the performance of a thruster, a one-dimensional fluid model of the plasma sheath in double walls is applied to study the characteristics of a magnetized sheath. The effects of secondary electron emission （SEE） coefficients and trapping coefficients, as well as magnetic field, on the structure of the plasma sheath are investigated. The results show that sheath potential and wall potential rise with the increment of SEE coefficient and trapping coefficient which results in a reduced sheath thickness. In addition, magnetic field strength will influence the sheath potential distributions.

关 键 词：Hall thruster magnetized sheath secondary electron 

分 类 号：V439[航空宇航科学与技术—航空宇航推进理论与工程]