Observation of nonlinear coupling between small-poloidal wave-number potential fluctuations and turbulent potential fluctuations in ohmically heated plasmas in the JFT-2M tokamak

Y. Nagashima, K. Hoshino, A. Ejiri, K. Shinohara, Y. Takase, K. Tsuzuki, K. Uehara, H. Kawashima, H. Ogawa, T. Ido, Y. Kusama, Y. Miura

研究成果: Contribution to journalArticle査読

121 被引用数 (Scopus)

抄録

Two types of electrostatic modes with small-poloidal wave numbers (∼1 and 10-15kHz) are observed in the edge region of Ohmically heated plasmas in the JFT-2M tokamak. The envelope of the higher frequency coherent mode is modulated at the frequency of the lower frequency mode. A bispectral analysis revealed that a significant nonlinear coupling among the two types of fluctuations and the broadband background turbulent potential fluctuations occurs inside the last closed magnetic flux surface, suggesting that a nonlinear process such as the parametric-modulational instability is involved.

本文言語英語
論文番号095002
ジャーナルPhysical Review Letters
95
9
DOI
出版ステータス出版済み - 8 26 2005
外部発表はい

All Science Journal Classification (ASJC) codes

  • 物理学および天文学(全般)

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