NIFS-759

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Author(s):

S. Kubo, T. Shimozuma, H. Idei, Y. Yoshimura, T. Notake, M. Sato, K. Ohkubo, T. Watari,K. Narihara, I. Yamada, S. Inagaki, Y. Nagayama, S. Murakami, S. Muto,Y. Takeiri, M. Yokoyama, N. Ohyabu, K. Ida, K. Kawahata, O. Kaneko, A. Komori, T. Mutoh, Y. Nakamura, H. Yamada, T. Akiyama, N. Ashikawa, M. Emoto, H. Funaba, P. Goncharov M. Goto, K. Ikeda, M. Isobe, H. Kawazome, K. Khlopenkov, T. Kobuchi, A. Kostrioukov, R. Kumazawa, Y. Liang, S. Masuzaki, T. Minami, J. Miyazawa, T. Morisaki, S. Morita, H. Nakanishi, Y. Narushima, K. Nishimura, N. Noda, H. Nozato, S. Ohdachi, Y. Oka, M. Osakabe, T. Ozaki, B. J. Peterson, A. Sagara, T. Saida, K. Saito, S. Sakakibara, R. Sakamoto, M. Sasao, K. Sato, T. Seki, M. Shoji, H. Suzuki, N. Takeuchi, N. Tamura, K. Tanaka, K. Toi, T. Tokuzawa, Y. Torii, K. Tsumori, K. Y. Watanabe, Y. Xu, S. Yamamoto, T. Yamamoto, M. Yoshinuma, K. Itoh, T. Satow, S. Sudo, T. Uda, K. Yamazaki, K. Matsuoka, O. Motojima, Y. Hamada and M. Fujiwara

Title:

Transport Barrier Formation by Application of Localized ECH in the LHD

Date of publication:

Oct. 2002

Key words:

IAEA, fusion energy conference, Lyon

Abstract:

In the past three years, the LHD [1] has revealed confinement properties as good as those of tokamaks. And achieved beta value of 3.2% has been attained, satisfying necessary condition to be a candidate for a reactor core [2]. However, a fundamental question remains; whether or not such high performance is maintained in a collisionless regime as the electron temperature gets higher. Indeed, the electron temperature remained below 4keV for the past 3 years as if it were caught in the vicious dependence that the energy confinement time is proportional to T_e^-7/2 as predicted in the neoclassical theory without electric field. This paper reports that a plasma of 10keV was achieved in the 5th campaign of the LHD, carried out in 2001, resolving such a concern and opening a new regime of extremely low collisionality. This regime of high T_e has the features of the ITB and is obtained by achieving special experimental conditions.

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