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Author Gunell, H. ♦ Verboncoeur, J. P. ♦ Brenning, N. ♦ Torven, S.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PLASMA PHYSICS AND FUSION ♦ ELECTRON BEAMS ♦ ELECTRIC FIELDS ♦ BEAM-PLASMA SYSTEMS ♦ HIGH-FREQUENCY DISCHARGES ♦ THERMAL SPIKES ♦ WAVE PROPAGATION ♦ DENSITY ♦ WAVELENGTHS ♦ STANDING WAVES ♦ TRAPPING ♦ SIMULATION
Abstract High-frequency waves, which are driven by a strong electron beam and propagate along a density gradient, can form spatially concentrated {open_quote}{open_quote}HF spikes{close_quote}{close_quote} which extend typically one wavelength (1 cm) in the direction along the beam. Experiments and computer simulations show that the spike is a standing wave with nodes at boundaries to regions with propagating waves. The spikes only form in a plasma density gradient, and attempts to produce them in homogeneous plasma have failed. They form without trapping of the waves in density cavities and remain stable after the formation, i.e., there is no tendency towards collapse of the structure. {copyright} {ital 1996 The American Physical Society.}
ISSN 00319007
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-12-01
Publisher Place United States
Journal Physical Review Letters
Volume Number 77
Issue Number 25


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