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Author Oertl, M. ♦ Kuhn, S. ♦ Krumm, P. ♦ Schupfer, N. ♦ Crystal, T. L.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PLASMA PHYSICS AND FUSION ♦ Q DEVICES ♦ COLLISIONLESS PLASMA ♦ KINETIC EQUATIONS ♦ PLASMA DIAGNOSTICS ♦ PLASMA POTENTIAL ♦ SPACE CHARGE ♦ TRAPPED ELECTRONS
Abstract Measurements of basic plasma parameters in a low-density single-ended Q machine with a negatively biased cold plate are compared with pertinent predictions of time-independent collisionless plane-diode theory. As was also found in particle simulations [Phys. Fluids B {bold 3}, 244 (1991)] and previous experiments, theory and experiment agree well if space-charge conditions near the hot-plate surface are electron rich, in which case the potential distributions are monotonically decreasing. For ion-rich conditions, however, where the potential distributions exhibit a single maximum located in front of the hot plate, the plasma properties are found to depend very sensitively on the amount and distribution of the electrons trapped in the region of positive potential. In this regime, the experimental findings agree very well with a theoretical model in which a certain amount of trapped electrons is assumed. {copyright} {ital 1996 American Institute of Physics.}
ISSN 1070664X
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-04-01
Publisher Place United States
Journal Physics of Plasmas
Volume Number 3
Issue Number 4


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