Effect of Secondary Electron Emission on the Sheath in SPT Chamber  

作　　者：薛中华 赵晓云 王丰 刘金远 刘悦 宫野 

机构地区：[1]School of Physics and Optoelectronic Technology and College of Advanced Science and Technology,Dalian University of Technology

出　　处：《Plasma Science and Technology》2009年第1期57-61,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.10605008,10875024)

摘　　要：A one-dimensional slab model of the plasma sheath in the stationary plasma thruster （SPT） chamber is developed in this study. It is considered that secondary electrons emitted from ceramic walls are partially trapped by the bulk plasma in the SPT chamber; some secondary electrons drift across the sheath where they are generated and the bulk and move towards the opposite sheath. Thus both the secondary electron emission （SEE） from one sheath and the partially trapped secondary electrons from the opposite sheath contribute to this sheath. The results indicate that both the SEE coefficient and trapping coefficient have a significant impact not only on the distributions of both electrons and ions of the SPT sheath but also on the energy flux loss to the SPT wall. When the trapping coefficient increases, the energy flux of electrons deposited to the walls will increase whereas that of ions will decrease. Besides, the critical electron temperature will decrease greatly with the increase of the trapping coefficient.A one-dimensional slab model of the plasma sheath in the stationary plasma thruster （SPT） chamber is developed in this study. It is considered that secondary electrons emitted from ceramic walls are partially trapped by the bulk plasma in the SPT chamber; some secondary electrons drift across the sheath where they are generated and the bulk and move towards the opposite sheath. Thus both the secondary electron emission （SEE） from one sheath and the partially trapped secondary electrons from the opposite sheath contribute to this sheath. The results indicate that both the SEE coefficient and trapping coefficient have a significant impact not only on the distributions of both electrons and ions of the SPT sheath but also on the energy flux loss to the SPT wall. When the trapping coefficient increases, the energy flux of electrons deposited to the walls will increase whereas that of ions will decrease. Besides, the critical electron temperature will decrease greatly with the increase of the trapping coefficient.

关 键 词：stationary plasma thruster secondary electron emission SHEATH 

分 类 号：O462.2[理学—电子物理学]