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

M. Ono*, M. Porkolab, R. P H Chang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Parametric excitation of a nonresonant ion quasi-mode in a low density (i.e., ωpi ≈Ωi) plasma is observed when the pump frequency is ω0≳2Ωi. 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 (US)
Pages (from-to)1675-1681
Number of pages7
JournalPhysics of Fluids
Volume23
Issue number8
DOIs
StatePublished - Jan 1 1980

ASJC Scopus subject areas

  • Computational Mechanics
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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