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Author(s):
S. Sakakibara, H. Yamada, K. Y. Watanabe, Y. Narushima, K. Toi, S. Ohdachi, M. Takichi, S. Yamamoto, K. Narihara, K. Tanaka, N. Ashikawa, P. Devaries, M. Emoto, H. Funaba, M. Goto, K. Ida, H. Idei, K. Ikeda, S. Inagaki, N. Inoue, M. Isobe, S. Kado, O. Kaneko, K. Kawahata, K. Khlopenkov, A. Komori, S. Kubo, R. Kumazawa,S. Masuzaki, T. Minami, J. Miyazawa, T. Morisaki, S. Morita, S. Murakami, S. Muto, T. Mutoh, Y. Nagayama, Y. Nakamura, H. Nakanishi, K. Nishimura, N. Noda, T. Notake, T. Kobuchi, Y. Liang, N. Ohyabu, Y. Oka, M. Osakabe, T. Ozaki, R.O. Pavlichenko, B.J. Peterson, A. Sagara, K. Saito, R. Sakamoto, H. Sasao, M. Sasao, K. Sato, M. Sato, T. Seki, T. Shimozuma, M. Shoji, H. Suzuki, Y. Takeiri, N. Tamura, T. Tokuzawa, Y. Torii, K. Tsumori, I. Yamada, S. Yamaguchi, M. Yokoyama, Y. Yoshimura, T. Watari,N. Nakajima, K. Ichiguchi, H. Takahashi, A.W. Cooper, K. Yamazaki, O. Motojima, Y. Hamada, M. Fujiwara
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Title:
MHD Characteristics in High-beta Regime of the Large Helical Device
Date of publication:
Sep. 2000
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Key words:
IAEA, fusion energy conference, Sorrento
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Abstract:
The highest volume averaged beta value beta_t of 2.2% at B_t = 0.75 T (gas puff) and 2.4 % at B_t = 1.3 T (pellet) in all of helical devices have been achieved in the Large Helical Device (LHD). The beta_t dependence of MHD activities has been investigated in NBI plasmas. The n/m = l/2 mode excited in the core region and / = l resonant modes in peripheral region have been observed. Both of the fluctuation amplitudes increase with beta_t and the pressure gradient. The strong n/m = l/2 mode which affects plasma profile have been observed in high-beta_t discharges and the abrupt disappearance of the mode leads to the restoration of T_e profile. Violent instabilities which terminate the plasma and degradation of global energy confmement have not been observed so far.
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