Edge thermal transport barrier in LHD discharges

N. Ohyabu, K. Narihara, H. Funaba, T. Morisaki, S. Masuzaki, K. Kawahata, A. Komori, O. Kaneko, H. Yamada, P. de Vries, M. Emoto, M. Goto, Y. Hamada, K. Ida, H. Idei, S. Inagaki, N. Inoue, S. Kado, S. Kubo, R. KumazawaT. Minami, J. Miyazawa, S. Morita, S. Murakami, T. Mutoh, S. Muto, Y. Nagayama, Y. Nakamura, H. Nakanishi, K. Nishimura, N. Noda, T. Kobuchi, S. Ohdachi, K. Ohkubo, Y. Oka, M. Osakabe, T. Ozaki, B. J. Peterson, A. Sagara, S. Sakakibara, R. Sakamoto, H. Sasao, M. Sasao, K. Sato, K. Saito, M. Sato, T. Seki, T. Shimozuma, M. Shoji, H. Suzuki, S. Sudo, Y. Takeiri, K. Tanaka, K. Toi, T. Tokuzawa, K. Tsumori, K. Tsuzuki, I. Yamada, S. Yamaguchi, K. Yamazaki, M. Yokoyama, K. Y. Watanabe, T. Watari, O. Motojima

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Abstract

In LHD discharges a significant enhancement of the global energy confinement has been achieved for the first time in a helical device with an edge thermal barrier, which exhibits a sharp gradient at the edge of the temperature profile. Key features associated with the barrier are quite different from those seen in tokamaks: (i) almost no change in particle (including impurity) transport, (ii) a gradual formation of the barrier, (iii) a very high ratio of the edge temperature to the average temperature, and (iv) no edge relaxation phenomenon. These features are very attractive in applying the thermal barrier to future reactor grade devices.

Original languageEnglish
Pages (from-to)103-106
Number of pages4
JournalPhysical Review Letters
Volume84
Issue number1
DOIs
Publication statusPublished - Jan 1 2000

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Ohyabu, N., Narihara, K., Funaba, H., Morisaki, T., Masuzaki, S., Kawahata, K., ... Motojima, O. (2000). Edge thermal transport barrier in LHD discharges. Physical Review Letters, 84(1), 103-106. https://doi.org/10.1103/PhysRevLett.84.103