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Dynamics of runaway tails with time-dependent sub-Dreicer dc fields in magnetized plasmasThe evolution of runaway tails driven by sub-Dreicer time-dependent dc fields in a magnetized plasma are studied numerically using a quasi-linear code based on the Ritz-Galerkin method and finite elements. It is found that the runaway tail maintained a negative slope during the dc field increase. Depending on the values of the dc electric field at t = 0 and the electron gyrofrequency to the plasma frequency ratio the runaway tail became unstable to the anomalous Doppler resonance or remained stable before the saturation of the dc field at some maximum value. The systems that remained stable during this stage became unstable to the anomalous Doppler or the Cerenkov resonances when the dc field was kept at the saturation level or decreased. Once the instability is triggered, the runaway tail is isotropized.
Document ID
19880029137
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Moghaddam-Taaheri, E.
(Iowa, University Iowa City, United States)
Vlahos, L.
(Salonika, University Greece)
Date Acquired
August 13, 2013
Publication Date
October 1, 1987
Publication Information
Publication: Physics of Fluids
Volume: 30
ISSN: 0031-9171
Subject Category
Plasma Physics
Funding Number(s)
CONTRACT_GRANT: NAGW-970
CONTRACT_GRANT: NAGW-81
Distribution Limits
Public
Copyright
Other
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