Studies on parametric instabilities in high-frequency wave heating of fusion plasmas: Dissertation

Jukka Heikkinen

Research output: ThesisDissertation

Abstract

The effect of secondary wave coupling mechanism on parametric instabilities in plasmas for fusion applications was investigated. Harmonic generation of the low-frequency wave is found to reduce well the reflectivity of Brillouin scattering and to suppress the convective growth of the lower hybrid decay instability. Saturation of Raman scattering by ion wave coupling of the low-frequency mode is also obtained. A very complicated (apparently chaotic) time behavior for weakly damped waves is observed, illustrating the strong nonlinearity inherent in the wave equation systems. The linear threshold for the parametric scattering of the heating wave in electron-cyclotron resonance heating of tokamak plasma was studied.
Original languageEnglish
QualificationDoctor Degree
Awarding Institution
  • Helsinki University of Technology
Place of PublicationHelsinki
Print ISBNs951-666-240-4
Publication statusPublished - 1987
MoE publication typeG5 Doctoral dissertation (article)

Keywords

  • controlled fusion
  • magnetohydrodynamic stability
  • plasma heating
  • plasma physics
  • thermodynamic coupling
  • Tokamak devices

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