Observation of the low to high confinement transition in the large helical device

K. Toi, S. Ohdachi, S. Sakakibara, K. Narihara, K. Tanaka, S. Morita, T. Morisaki, M. Goto, S. Takagi, F. Watanabe, N. Nakajima, K. Y. Watanabe, K. Ida, K. Ikeda, S. Inagaki, O. Kaneko, K. Kawahata, A. Komori, S. Masuzaki, K. MatsuokaJ. Miyazawa, K. Nagaoka, Y. Nagayama, Y. Oka, M. Osakabe, N. Ohyabu, Y. Takeiri, T. Tokuzawa, K. Tsumori, H. Yamada, I. Yamada, K. Yoshinuma, S. Yamamoto

研究成果: Contribution to journalArticle査読

37 被引用数 (Scopus)

抄録

The low to high confinement transition has been observed on the large helical device fA. Iiyoshi, A. Komori, A. Ejiri et al., Nucl. Fusion 39, 1245 s1999dg, exhibiting rapid increase in edge electron density with sharp depression of Ha emission. The transition occurs in low toroidal field sBt =0.5-0.75 Td discharges and are heated by high power neutral beam injection. The plasma thus has a relatively high value s,1.5%d of the volume averaged b value. The electron temperature and density profiles have steep gradients at the edge region which has high magnetic shear but is at a magnetic hill. Formation of the edge transport barrier leads to enhanced activities of the interchange type of modes with m=2/n=3 sm,n are the poloidal and toroidal mode numbersd in the edge region. At present, these magnetohydrodynamic activities limit the rise of the stored energy; the resultant increment of the stored energy remains modest.

本文言語英語
論文番号020701
ジャーナルPhysics of Plasmas
12
2
DOI
出版ステータス出版済み - 1 12 2005
外部発表はい

All Science Journal Classification (ASJC) codes

  • 凝縮系物理学

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