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

Fingerprint

Plasma waves
Landau damping
plasma waves
Damping
Magnetic fields
magnetic fields
longitudinal waves
coupling coefficients
Cyclotrons
coupled modes
cyclotrons
Interferometers
interferometers
harmonics
decay
matrices
predictions

ASJC Scopus subject areas

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

Cite this

Experimental studies of nonlinear Landau damping and growth of plasma waves in a magnetic field. / Chang, Robert P. H.; Porkolab, M.

In: Physics of Fluids, Vol. 15, No. 2, 1972, p. 297-303.

Research output: Contribution to journalArticle

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