Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Physics of Fluids
31 (1988), S. 1515-1531
ISSN:
1089-7666
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Using particle-in-cell simulations and analytical methods, a study of the nonlinear evolution of electromagnetic instabilities driven by an anisotropic electron beam (Tb⊥(very-much-greater-than)Tb(parallel)) 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.866691
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