Parametric decay instability near the upper hybrid resonance in magnetically confined fusion plasmas

Søren Kjer Hansen, Stefan Kragh Nielsen, Mirko Salewski, Morten Stejner Pedersen, J. Stober

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Abstract

In this paper we investigate parametric decay of an electromagnetic pump wave into two electrostatic daughter waves, particularly an X-mode pump wave decaying into a warm upper hybrid wave (a limit of an electron Bernstein wave) and a warm lower hybrid wave. We describe the general theory of the above parametric decay instability (PDI), unifying earlier treatments, and show that it may occur in underdense and weakly overdense plasmas. The PDI theory is used to explain anomalous sidebands observed in collective Thomson scattering (CTS) spectra at the ASDEX Upgrade tokamak. The theory may also account for similar observations during CTS experiments in stellarators, as well as in some 1st harmonic electron cyclotron resonance and O-X-B heating experiments.
Original languageEnglish
Article number105006
JournalPlasma Physics and Controlled Fusion
Volume59
Issue number10
Number of pages21
ISSN0741-3335
DOIs
Publication statusPublished - 2017

Keywords

  • PDI
  • UHR
  • UH
  • LH
  • CTS
  • ECRH
  • Electron Bernstein wave

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