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: Contribution to journalArticle査読

4 被引用数 (Scopus)

抄録

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.

本文言語英語
論文番号10F507
ジャーナルReview of Scientific Instruments
79
10
DOI
出版ステータス出版済み - 2008
外部発表はい

All Science Journal Classification (ASJC) codes

  • Instrumentation

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