Experimental investigation of virtual cathode sheath in the presence of secondary electrons produced by streaming ions

被引：9
作者：
Li, Wei
Ma, J. X. [1 ]
Li, Jing-ju
Wei, Zi-an
机构：
[1] Univ Sci & Technol China, CAS Key Lab Basic Plasma Phys, Hefei 230026, Anhui, Peoples R China
来源：
PHYSICS OF PLASMAS | 2012年 / 19卷 / 11期
基金：
中国国家自然科学基金;
关键词：
PLASMA-SHEATH; COLLISIONAL SHEATH; BOUNDARY; PRESHEATH; EMISSION; VELOCITY; PROBES; WALLS; MODEL;
D O I：
10.1063/1.4769117
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
The potential profiles near a negatively biased stainless steel plate or mesh immersed in an unmagnetized weakly collisional plasma were investigated experimentally. The results show that deep virtual cathode structures arise inside the sheath region in front of the plate caused by secondary electrons produced by streaming ions hitting the surface of the plate. The characteristics of the virtual cathode depend on the incoming ion energy, neutral gas pressure, and bulk plasma density. In addition, the replacement of the plate with the mesh results in the suppression of the virtual cathode because of the equivalent reduction in the secondary electron yield. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4769117]
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页数：6
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