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, Inagaki Shigeru, O. Kaneko, K. Kawahata, A. Komori, S. Masuzaki, K. Matsuoka & 13 others J. 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

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number020701
JournalPhysics of Plasmas
Volume12
Issue number2
DOIs
Publication statusPublished - Jan 12 2005
Externally publishedYes

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beam injection
neutral beams
temperature profiles
magnetohydrodynamics
fusion
electron energy
shear
gradients
energy
profiles

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Toi, K., Ohdachi, S., Sakakibara, S., Narihara, K., Tanaka, K., Morita, S., ... Yamamoto, S. (2005). Observation of the low to high confinement transition in the large helical device. Physics of Plasmas, 12(2), [020701]. https://doi.org/10.1063/1.1843122g

Observation of the low to high confinement transition in the large helical device. / Toi, K.; Ohdachi, S.; Sakakibara, S.; Narihara, K.; Tanaka, K.; Morita, S.; Morisaki, T.; Goto, M.; Takagi, S.; Watanabe, F.; Nakajima, N.; Watanabe, K. Y.; Ida, K.; Ikeda, K.; Shigeru, Inagaki; Kaneko, O.; Kawahata, K.; Komori, A.; Masuzaki, S.; Matsuoka, K.; Miyazawa, J.; Nagaoka, K.; Nagayama, Y.; Oka, Y.; Osakabe, M.; Ohyabu, N.; Takeiri, Y.; Tokuzawa, T.; Tsumori, K.; Yamada, H.; Yamada, I.; Yoshinuma, K.; Yamamoto, S.

In: Physics of Plasmas, Vol. 12, No. 2, 020701, 12.01.2005.

Research output: Contribution to journalArticle

Toi, K, Ohdachi, S, Sakakibara, S, Narihara, K, Tanaka, K, Morita, S, Morisaki, T, Goto, M, Takagi, S, Watanabe, F, Nakajima, N, Watanabe, KY, Ida, K, Ikeda, K, Shigeru, I, Kaneko, O, Kawahata, K, Komori, A, Masuzaki, S, Matsuoka, K, Miyazawa, J, Nagaoka, K, Nagayama, Y, Oka, Y, Osakabe, M, Ohyabu, N, Takeiri, Y, Tokuzawa, T, Tsumori, K, Yamada, H, Yamada, I, Yoshinuma, K & Yamamoto, S 2005, 'Observation of the low to high confinement transition in the large helical device', Physics of Plasmas, vol. 12, no. 2, 020701. https://doi.org/10.1063/1.1843122g
Toi K, Ohdachi S, Sakakibara S, Narihara K, Tanaka K, Morita S et al. Observation of the low to high confinement transition in the large helical device. Physics of Plasmas. 2005 Jan 12;12(2). 020701. https://doi.org/10.1063/1.1843122g
Toi, K. ; Ohdachi, S. ; Sakakibara, S. ; Narihara, K. ; Tanaka, K. ; Morita, S. ; Morisaki, T. ; Goto, M. ; Takagi, S. ; Watanabe, F. ; Nakajima, N. ; Watanabe, K. Y. ; Ida, K. ; Ikeda, K. ; Shigeru, Inagaki ; Kaneko, O. ; Kawahata, K. ; Komori, A. ; Masuzaki, S. ; Matsuoka, K. ; Miyazawa, J. ; Nagaoka, K. ; Nagayama, Y. ; Oka, Y. ; Osakabe, M. ; Ohyabu, N. ; Takeiri, Y. ; Tokuzawa, T. ; Tsumori, K. ; Yamada, H. ; Yamada, I. ; Yoshinuma, K. ; Yamamoto, S. / Observation of the low to high confinement transition in the large helical device. In: Physics of Plasmas. 2005 ; Vol. 12, No. 2.
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AU - Morita, S.

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AU - Osakabe, M.

AU - Ohyabu, N.

AU - Takeiri, Y.

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