Experimental studies of nonlinear Landau damping and growth of plasma waves in a magnetic field

Robert P. H. Chang, M. Porkolab

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The nonlinear Landau damping and growth of longitudinal waves in a magnetic field is studied experimentally. It is observed that a finite-amplitude cyclotron harmonic wave may decay nonresonantly into a similar, small-amplitude wave. This perturbed wave dan be amplified exponentially by increasing the amplitude of the finite-amplitude wave. Similarly, an externally launched small-amplitude test wave, having the same frequency as the perturbed wave, can be amplified at a comparable rate. The spatial growth of the test wave is in agreement with the predictions of a third-order mode-coupling equation. Using a calibrated interferometer system, the nonlinear Landau damping coupling coefficients (matrix elements) are measured quantitatively, and are found to be in good agreement with theory.

Original languageEnglish
Pages (from-to)297-303
Number of pages7
JournalPhysics of Fluids
Volume15
Issue number2
Publication statusPublished - 1972

ASJC Scopus subject areas

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

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