Parametric excitation of ion quasi-mode by the pump near the ion cyclotron frequency

M. Ono, M. Porkolab, Robert P. H. Chang

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Parametric excitation of a nonresonant ion quasi-mode in a low density (i.e., ω pi ≈Ω i) plasma is observed when the pump frequency is ω 0≳2Ω i. From the interferometry measurement, the lower sideband is identified to be the cold lower hybrid wave and the low-frequency mode is shown to be a nonresonant ion quasi-mode. The dependence of the excitation process and the threshold upon density has been measured and was found to agree well with theory. The ion heating associated with this decay process is also observed. Such processes may take place near the plasma surface during ion cyclotron range of frequency heating experiments in tokamaks.

Original languageEnglish
Pages (from-to)1675-1681
Number of pages7
JournalPhysics of Fluids
Volume23
Issue number8
Publication statusPublished - 1980

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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