Journal
PHYSICS OF PLASMAS
Volume 17, Issue 5, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.3276773
Keywords
discharges (electric); ionisation; plasma density; plasma diagnostics; plasma instability; plasma sheaths
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Funding
- Division Of Physics
- Direct For Mathematical & Physical Scien [GRANTS:14025325, 0902085] Funding Source: National Science Foundation
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Observations in steady-state plasmas confirm predictions that formation of a current-free double layer in a plasma expanding into a chamber of larger diameter is accompanied by an increase in ionization upstream of the double layer. The upstream plasma density increases sharply at the same driving frequency at which a double layer appears. For driving frequencies at which no double layer appears, large electrostatic instabilities are observed. Time-resolved measurements in pulsed discharges indicate that the double layer initially forms for all driving frequencies. However, for particularly strong double layers, instabilities appear early in the discharge and the double layer collapses. (C) 2010 American Institute of Physics. [doi:10.1063/1.3276773]
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