Detection of a new parametric decay instability branch in TST-2 during high harmonic fast wave heating

Y. Adachi, A. Ejiri, Y. Takase, O. Watanabe, T. Oosako, H. Tojo, S. Kainaga, T. Masuda, M. Sasaki, J. Sugiyama, T. Yamaguchi

研究成果: ジャーナルへの寄稿記事

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抜粋

Parametric decay instability (PDI) is often observed in the TST-2 spherical tokamak during high harmonic fast wave heating by rf pickup probes. The frequency spectrum exhibits lower and upper sideband peaks in addition to the pump wave at f0 =21 MHz. Two types of PDI are observed. One is the well-known decay into the ion-cyclotron quasimode (n fci) and the ion Bernstein wave (f0 -n fci). The other is a newly found decay with the sideband frequency between f0 and f0 - fci. The frequency difference between this sideband and the pump increases in proportion to Bt. Moreover, high-speed visible light measuring systems with photomultiplier tubes or hybrid photodetectors viewing the plasma core detected oscillation of light emission at around f0.

元の言語英語
記事番号10F507
ジャーナルReview of Scientific Instruments
79
発行部数10
DOI
出版物ステータス出版済み - 11 10 2008
外部発表Yes

All Science Journal Classification (ASJC) codes

  • Instrumentation

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    Adachi, Y., Ejiri, A., Takase, Y., Watanabe, O., Oosako, T., Tojo, H., Kainaga, S., Masuda, T., Sasaki, M., Sugiyama, J., & Yamaguchi, T. (2008). Detection of a new parametric decay instability branch in TST-2 during high harmonic fast wave heating. Review of Scientific Instruments, 79(10), [10F507]. https://doi.org/10.1063/1.2955574