ISSN:
1089-7674
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The fluid equations describing the plasma–wall sheath in an electropositive gas are solved numerically with parameters, δi the ratio of the ion collision frequency νi to the ionization rate Z, and α the ratio of the ionization rate to the ion plasma frequency ωpi. From the behavior of the ion speed and from the plasma balance equation relating the plasma dimension L to Z it is possible to identify regions in α−δi space in which the plasma is (a) collisionless, (b) transitional, and (c) collisional and in which the boundary layer is (i) collisionless and (ii) collisional. The Bohm criterion ceases to have significance when the layer matching plasma and wall becomes collisional. © 2000 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.874161
Permalink