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research article

Existence of subsonic plasma sheaths

Loizu, Joaquim  
•
Ricci, Paolo  
•
Theiler, Christian  
2011
Physical Review E

The location of the plasma sheath edge, where quasineutrality is broken, is rigorously derived by using a kinetic description of the plasma. It is shown that sheaths can exist with arbitrarily small ion velocity at the sheath edge, thus violating the Bohm criterion, Vi = cs at the sheath edge. Bohm’s criterion is recovered in the case of large enough ion current through the wall, and it is found to be a reasonable approximation in floating potential conditions. However, in the case of a predominant electron current through the wall, Bohm’s criterion is not able to describe the sheath-edge transition. The analytical results are supported by numerical simulations performed with a fully kinetic particle-in-cell code modeling a source-driven, weakly collisional plasma, bound between two absorbing walls.

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Type
research article
DOI
10.1103/PhysRevE.83.016406
Web of Science ID

WOS:000286763100008

Author(s)
Loizu, Joaquim  
Ricci, Paolo  
Theiler, Christian  
Date Issued

2011

Publisher

American Physical Society

Published in
Physical Review E
Volume

83

Issue

1

Article Number

016406

Subjects

TORPEX

•

CRPP_EDGE

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
CRPP  
SPC  
Available on Infoscience
January 28, 2011
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/63503
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