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Runaway tails in magnetized plasmasThe evolution of a runaway tail driven by a dc electric field in a magnetized plasma is analyzed. Depending on the strength of the electric field and the ratio of plasma to gyrofrequency, there are three different regimes in the evolution of the tail. The tail can be (1) stable with electrons accelerated to large parallel velocities, (2) unstable to Cerenkov resonance because of the depletion of the bulk and the formation of a positive slope, (3) unstable to the anomalous Doppler resonance instability driven by the large velocity anisotropy in the tail. Once an instability is triggered (Cerenkov or anomalous Doppler resonance) the tail relaxes into an isotropic distribution. The role of a convection type loss term is also discussed.
Document ID
19860030106
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Moghaddam-Taaheri, E. (Maryland Univ. College Park, MD, United States)
Vlahos, L. (Maryland Univ. College Park, MD, United States)
Rowland, H. L. (Maryland Univ. College Park, MD, United States)
Papadopoulos, K. (Maryland, University College Park, United States)
Date Acquired
August 12, 2013
Publication Date
November 1, 1985
Publication Information
Publication: Physics of Fluids
Volume: 28
ISSN: 0031-9171
Subject Category
PLASMA PHYSICS
Funding Number(s)
CONTRACT_GRANT: NSF ATM-85-00794
CONTRACT_GRANT: N00014-79-C-0665
CONTRACT_GRANT: NAGW-81
Distribution Limits
Public
Copyright
Other