Practical definition of the plasma sheath edge for modeling planar glow discharges
- 1 May 1995
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 66 (18) , 2329-2330
- https://doi.org/10.1063/1.113972
Abstract
While the parallel-plate capacitive model is often employed to describe the electrical behavior of a plasma sheath, the simple question of how far apart the two plates are for a given plasma cannot be easily answered yet because of the lack of a workable definition of the sheath edge. The sheath edge estimated with the Child–Langmuir equation may misplace as much as 40% of the total space charge outside the sheath. An alternative practical definition of the sheath edge is proposed that includes almost all space charge within the sheath.Keywords
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