Regions of kinetic geodesic acoustic modes and streamers in JIPPT-IIU tokamak plasmas

Y. Hamada, T. Watari, A. Nishizawa, O. Yamagishi, K. Narihara, Y. Kawasumi, T. Ido, M. Kojima, K. Toi

研究成果: Contribution to journalArticle査読

8 被引用数 (Scopus)

抄録

The radial extent of kinetic geodesic acoustic modes (KGAMs) and streamers is measured using a heavy ion beam probe. Intense KGAM oscillations are observed in the core region of a low-density ohmic (OH) plasma where T eT i and outside this region, streamers characterized by steepening fronts are observed. The radial profile of plasma density stays flat in the region of the streamers, showing a rise in the plasma density in two regions, one at the scrape-off layer and the other in the core region during the radial scan of sample volumes. Intense (up to eΦ/kT e0.1) and broad GAM oscillations (δf/f0.5) are observed in the r<a p/2 region of tokamak plasmas. GAM oscillations and streamers are strongly reduced in the heated phase. In addition, the radial profile of the spectra of GAM in the heated phase is very different from that of a low-density OH plasma. The streamers and the two-step rise in the density radial profile disappear in the heated phase.

本文言語英語
論文番号063023
ジャーナルNuclear Fusion
52
6
DOI
出版ステータス出版済み - 6 1 2012
外部発表はい

All Science Journal Classification (ASJC) codes

  • 核物理学および高エネルギー物理学
  • 凝縮系物理学

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