Double Layers in a Modestly Collisional Electronegative Discharge

dc.contributor.authorSheridan, T
dc.date.accessioned2015-12-13T23:34:34Z
dc.date.available2015-12-13T23:34:34Z
dc.date.issued1999
dc.date.updated2015-12-12T09:36:30Z
dc.description.abstractThe effect of ion-neutral collisions on the structure and ion flux emanating from a steady-state, planar discharge with two negative components is investigated. The positive ion component is modelled as a cold fluid subject to constant-mobility collisions, while the electrons and negative ions obey Boltzmann relations. The model includes the collisionless limit. When the negative ions are sufficiently cold three types of discharge structures are found. For small negative ion concentrations or high collisionality, the discharge is 'stratified', with an electronegative core and an electropositive edge. For the opposite conditions, the discharge is 'uniform' with the negative ion density remaining significant at the edge of the plasma. Between these cases lies the special case of a double-layer-stratified discharge, where quasi-neutrality is violated at the edge of the electronegative core. Double-layer-stratified solutions are robust in that they persist for moderate collisionality. Numerical solutions for finite non-neutrality verify that the plasma flux varies continuously with collisionality, although the derivative of the flux with respect to collisionality is discontinuous when the discharge structure changes from uniform to stratified. Double-layer solutions are found when the flux predicted for the plasma approximation is double-valued and the flux associated with the smaller plasma edge potential is less than that associated with the larger edge potential. A comparison with numerical non-neutral solutions confirms that the flux is correctly predicted using the plasma approximation when the larger value of the flux is taken in the two-solution regime.
dc.identifier.issn0022-3727
dc.identifier.urihttp://hdl.handle.net/1885/93500
dc.publisherInstitute of Physics Publishing
dc.sourceJournal of Physics D: Applied Physics
dc.subjectKeywords: Carrier concentration; Electric discharges; Electrons; Fluxes; Mathematical models; Negative ions; Numerical methods; Positive ions; Collisional electronegative discharge; Ion flux; Ion neutral collisions; Plasma edge potential; Plasma flux; Plasma collis
dc.titleDouble Layers in a Modestly Collisional Electronegative Discharge
dc.typeJournal article
local.bibliographicCitation.lastpage1767
local.bibliographicCitation.startpage1761
local.contributor.affiliationSheridan, T, College of Physical and Mathematical Sciences, ANU
local.contributor.authoremailrepository.admin@anu.edu.au
local.contributor.authoruidSheridan, T, u3201819
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.absfor020204 - Plasma Physics; Fusion Plasmas; Electrical Discharges
local.identifier.ariespublicationMigratedxPub24862
local.identifier.citationvolume32
local.identifier.doi10.1088/0022-3727/32/15/301
local.identifier.scopusID2-s2.0-0032660485
local.identifier.uidSubmittedByMigrated
local.type.statusPublished Version

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