Sheath structure of a hot-cathode in plasma

	Sheath structure of a hot-cathode in plasma
	Wang Dao-Yong ; Ma Jin-Xiu 1; Li Yi-Ren ; Zhang Wen-Gui
刊名	ACTA PHYSICA SINICA
	2009-12-01
卷号	58 页码:8432-8439
关键词	sheath thermionic emission Bohm criterion
ISSN号	1000-3290
英文摘要	The plasma sheath in the presence of virtual-cathode structure near a hot cathode was studied by combining the theory of thermionic emission and plasma fluid equations. Using Sagdeev potential method, the sheath solution and generalized Bohm criterion were discussed. It is shown that, different from usual Bohm sheath, the critical ion Mach number at the sheath-presheath edge is not an independent constant but depends on sheath potential drop as well as other parameters, owing to the fact that there exists large quantity of thermionic electrons near the hot cathode which has a significant influence on the whole sheath structure. The critical Mach number first increases and then decreases with the potential drop (from sheath-presheath edge to the virtual cathode), and monotonically increases with the temperature of the hot cathode. In the plane geometry, there exists an appreciable quantity of residual thermionic electrons which traverse the virtual cathode and sheath and enter into bulk plasma.
资助项目	National Natural Science Foundation of China[10875121] ; National Natural Science Foundation of China[40831062] ; Knowledge Innovation Program of Chinese Academy of Sciences[KJCX2-YW-N28] ; National Basic Research Program of China[2008CB717800]
WOS关键词	DUSTY PLASMA ; BOHM CRITERION ; SPACE-CHARGE ; THERMIONIC CURRENTS ; BOUNDARY ; ELECTRON ; FIELD
WOS研究方向	Physics
语种	英语
出版者	CHINESE PHYSICAL SOC
WOS记录号	WOS:000273681500049
资助机构	National Natural Science Foundation of China ; Knowledge Innovation Program of Chinese Academy of Sciences ; National Basic Research Program of China
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/30665]
专题	中国科学院近代物理研究所
通讯作者	Ma Jin-Xiu
作者单位	1.Univ Sci & Technol China, Dept Modern Phys, Chinese Acad Sci, Key Lab Basic Plasma Phys, Hefei 230026, Peoples R China 2.Univ Sci & Technol China, Dept Modern Phys, Chinese Acad Sci, Ctr Magnet Confinement Plasma Theory, Hefei 230026, Peoples R China
推荐引用方式 GB/T 7714	Wang Dao-Yong,Ma Jin-Xiu,Li Yi-Ren,et al. Sheath structure of a hot-cathode in plasma[J]. ACTA PHYSICA SINICA,2009,58:8432-8439.
APA	Wang Dao-Yong,Ma Jin-Xiu,Li Yi-Ren,&Zhang Wen-Gui.(2009).Sheath structure of a hot-cathode in plasma.ACTA PHYSICA SINICA,58,8432-8439.
MLA	Wang Dao-Yong,et al."Sheath structure of a hot-cathode in plasma".ACTA PHYSICA SINICA 58(2009):8432-8439.