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Effect of Secondary Electron Emission on the Sheath in SPT Chamber

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分类：O462.2[理学—电子物理学;理学—物理] TB33[一般工业技术—材料科学与工程]
作者机构：[1]Department of Physics, Dalian Maritime University, Dalian 116026, China, [2]College of Physics Science and Technology, Dalian University, Dalian 116622, China, [3]School of Physics and Optoelectronic Technology, Dalian University of Technology,Dalian 116024, China, [4]Department of Electrical Engineering, Harbin Institute of Technology, Harbin 150001,China
相关基金：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）, and the State Key Development for Basic Research of China （Nos. 2009GB105004, 2009GB106002）
相关项目：尘埃杂质在托卡马克边缘等离子体中输运特性研究

关键词：电子发射特性, 推进器, 二次电子发射, 等离子体鞘, 墙, 电势分布, 磁场强度, 流体模型, Hall thruster, magnetized sheath, secondary electron

中文摘要：

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.

英文摘要：

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.

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