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Theory and simulation of electromagnetic beam modes and whistlersUsing particle-in-cell simulations and analytical methods, a study of the nonlinear evolution of electromagnetic instabilities driven by an anisotropic electron beam in an external magnetic field is performed. The unstable waves are either whistlerlike or beam-mode-like depending on the external field strength and beam velocity. The evolution of the particle distribution differs significantly in the two regimes. Even in the presence of a faster electrostatic instability, the electromagnetic waves grow to a significant amplitude. In certain cases, an energetic tail is formed, resulting in enhanced Cerenkov emission of electrostatic waves. The initial evolution of the particle distribution is explained in terms of the interaction of a given linearly unstable wave with the self-consistent perturbed distribution.
Document ID
19880056882
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Newman, David L.
(Colorado Univ. Boulder, CO, United States)
Winglee, Robert M.
(Colorado Univ. Boulder, CO, United States)
Goldman, Martin V.
(Colorado, University Boulder, United States)
Date Acquired
August 13, 2013
Publication Date
June 1, 1988
Publication Information
Publication: Physics of Fluids
Volume: 31
ISSN: 0031-9171
Subject Category
Plasma Physics
Accession Number
88A44109
Funding Number(s)
CONTRACT_GRANT: NSF ATM-85-11906
CONTRACT_GRANT: NSG-7287
CONTRACT_GRANT: NAGW-91
Distribution Limits
Public
Copyright
Other

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