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

Dissertation

Jukka Heikkinen

Research output: ThesisDissertationCollection of Articles

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)

Fingerprint

fusion
heating
low frequencies
electron cyclotron resonance
scattering
wave equations
S waves
harmonic generations
nonlinearity
Raman spectra
saturation
reflectance
thresholds
decay
ions

Keywords

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

Cite this

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title = "Studies on parametric instabilities in high-frequency wave heating of fusion plasmas: Dissertation",
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.",
keywords = "controlled fusion, magnetohydrodynamic stability, plasma heating, plasma physics, thermodynamic coupling, Tokamak devices",
author = "Jukka Heikkinen",
note = "YDI",
year = "1987",
language = "English",
isbn = "951-666-240-4",
series = "Acta Polytechnica Scandinavica: Applied Physics Series",
publisher = "Finnish Academy of Technical Sciences",
school = "Helsinki University of Technology",

}

Heikkinen, J 1987, 'Studies on parametric instabilities in high-frequency wave heating of fusion plasmas: Dissertation', Doctor Degree, Helsinki University of Technology, Helsinki.

Studies on parametric instabilities in high-frequency wave heating of fusion plasmas : Dissertation. / Heikkinen, Jukka.

Helsinki, 1987. 27 p.

Research output: ThesisDissertationCollection of Articles

TY - THES

T1 - Studies on parametric instabilities in high-frequency wave heating of fusion plasmas

T2 - Dissertation

AU - Heikkinen, Jukka

N1 - YDI

PY - 1987

Y1 - 1987

N2 - 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.

AB - 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.

KW - controlled fusion

KW - magnetohydrodynamic stability

KW - plasma heating

KW - plasma physics

KW - thermodynamic coupling

KW - Tokamak devices

M3 - Dissertation

SN - 951-666-240-4

T3 - Acta Polytechnica Scandinavica: Applied Physics Series

CY - Helsinki

ER -