Open AccessParametric Instabilities in Lower-Hybrid-Frequency Heating of a Tokamak
Author(s) -
T. Imai,
T. Nagashima,
T. Yamamoto,
K. Uehara,
S. Konoshima,
Hiroshi Takeuchi,
H. Yoshida,
N. Fujisawa
Publication year - 1979
Publication title -
physical review letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.688
H-Index - 673
eISSN - 1079-7114
pISSN - 0031-9007
DOI - 10.1103/physrevlett.43.586
Subject(s) - lower hybrid oscillation , tokamak , plasma , dielectric heating , atomic physics , spectral line , parametric statistics , cyclotron , materials science , ion , penetration (warfare) , physics , nuclear physics , dielectric , optoelectronics , statistics , mathematics , quantum mechanics , astronomy , operations research , engineering
Decay spectra during the rf heating were identified as the parametric decay into the cold lower-hybrid waves and the ion-cyclotron waves at the plasma surface. The decay instabilities absorbed some fraction of the rf power, hence they affected the plasma heating. However, they did not prevent the penetration of the lower hybrid wave to the plasma center. Drastic reduction of the decay spectra was obtained when the resonant parametric decay condition was destroyed
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