The double sheath associated with electron emission into a plasma containing negative ions

被引：53

作者：

Amemiya, H

Annaratone, BM

Allen, JE

机构：

[1] Inst Phys & Chem Res, Wako, Saitama 35101, Japan

[2] Univ Oxford, Dept Engn Sci, Oxford OX1 3PJ, England

来源：

JOURNAL OF PLASMA PHYSICS | 1998年 / 60卷

关键词：

D O I：

10.1017/S0022377898006837

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 double sheath formed by thermal electrons and negative ions in a plasma and electrons emitted from an electrode is investigated. The ion energy at the sheath edge and the electric field at the electrode surface are calculated for several values of the ratio of negative-ion density to electron density. The maximum beam density above which a virtual cathode appears is given. The relation to the Langmuir limit is shown. The numerical results for the electric potential, the electric field and the space charge density are presented. The floating potential is calculated from the current balance of all components.

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页码：81 / 93

页数：13

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