Nonlinear decay and instability of a nonuniform finite-amplitude plasma wave

M. Porkolab, Robert P. H. Chang

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The effects of spatial nonuniformities in the amplitude of a decaying finite-amplitude plasma wave are examined. It is found that the usually neglected, but experimentally important, initial damping (or growth) of the finite-amplitude wave may have important consequences upon the decay process. The mode-coupling equations are solved for both forward-scattering and back-scattering type decay processes. The latter case is particularly interesting, since both amplification in space, and instability in time, of the perturbed waves may occur in the presence of damping mechanisms. Calculations are presented which show that longitudinal waves with frequencies in the vicinity of cyclotron harmonics may be subject to such instabilities.

Original languageEnglish
Pages (from-to)2054-2063
Number of pages10
JournalPhysics of Fluids
Volume13
Issue number8
Publication statusPublished - 1970

Fingerprint

Plasma waves
Plasma stability
plasma waves
decay
Damping
damping
Forward scattering
longitudinal waves
Cyclotrons
forward scattering
nonuniformity
coupled modes
cyclotrons
Amplification
Scattering
harmonics
scattering

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Mechanics of Materials
  • Computational Mechanics
  • Fluid Flow and Transfer Processes

Cite this

Nonlinear decay and instability of a nonuniform finite-amplitude plasma wave. / Porkolab, M.; Chang, Robert P. H.

In: Physics of Fluids, Vol. 13, No. 8, 1970, p. 2054-2063.

Research output: Contribution to journalArticle

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