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Sheath structure of a hot-cathode in plasma

Wang Dao-Yong Ma Jin-Xiu Li Yi-Ren Zhang Wen-Gui

Sheath structure of a hot-cathode in plasma

Wang Dao-Yong, Ma Jin-Xiu, Li Yi-Ren, Zhang Wen-Gui
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  • Abstract views:  4933
  • PDF Downloads:  1223
  • Cited By: 0
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  • Received Date:  19 January 2009
  • Accepted Date:  23 February 2009
  • Published Online:  20 December 2009

Sheath structure of a hot-cathode in plasma

  • 1. 中国科学技术大学近代物理系,中国科学院基础等离子体物理重点实验室和磁约束等离子体理论中心,合肥 230026

Abstract: 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.

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