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Author Tuszewski, M.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ PLASMA INSTABILITY ♦ ION PLASMA WAVES ♦ LANGMUIR PROBE ♦ ELECTRONEGATIVITY ♦ OXYGEN ♦ ELECTRIC DISCHARGES ♦ ION DENSITY ♦ MODULATION ♦ ION TEMPERATURE
Abstract An instability has been observed with Langmuir probes in cylindrical inductive discharges operated with low electronegative gas pressures. The instability consists of ion density modulations that propagate axially and radially at the ion acoustic speed. Measurements and calculations of negative ion concentrations in oxygen discharges suggest that the radial distribution and the magnitude of the density drops are consistent with the negative ion population. The instability appears to be a periodic expulsion of most negative ions from the plasma core. The cause of the modulations remains to be clarified. The instability may provide valuable information on negative ion concentrations and temperatures in a low pressure regime where measurements of those parameters are difficult. {copyright} {ital 1996 American Institute of Physics.}
ISSN 00218979
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-06-01
Publisher Place United States
Journal Journal of Applied Physics
Volume Number 79
Issue Number 12


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