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A. Iiyoshi, A. Komori, A. Ejiri, M. Emoto,
H. Funaba, M. Goto, K. Ida, H. Idei,
S. Inagaki, S. Kado, O. Kaneko, K. Kawahata,
T. Kobuchi, S. Kubo, R. Kumazawa, S. Masuzaki,
T. Minami, J. Miyazawa, T. Morisaki, S. Morita,
S. Murakami, S. Muto, T. Muto, Y. Nagayama,
Y. Nakamura, H. Nakanishi, K. Narihara,
K. Nishimura, N. Noda, S. Ohdachi, N. Ohyabu,
Y. Oka, M. Osakabe, T. Ozaki, B. J. Peterson,
A. Sagara, S. Sakakibara, R. Sakamoto, H. Sasao,
M. Sasao, K. Sato, M. Sato, T. Seki,
T. Shimozuma, M. Shoji, H. Suzuki, Y. Takeiri,
K. Tanaka, K. Toi, T. Tokuzawa, K. Tsumori,
K. Tsuzuki, K. Y. Watanabe, T. Watari, H. Yamada,
I. Yamada, S. Yamaguchi, M. Yokoyama, R. Akiyama,
H. Chikaraishi, K. Haba, S. Hamaguchi, M. Iima,
S. Imagawa, N. Inoue, K. Iwamoto, S. Kitagawa,
J. Kodaira, Y. Kubota, R. Maekawa, T. Mito,
T. Nagasaka, A. Nishimura, C. Takahashi,
K. Takahata, Y. Takita, H. Tamura, T. Tsuzuki,
S. Yamada, N. Yanagi, K. Yamauchi, H. Yonezu,
Y. Hamada, K. Matsuoka, K. Murai, K. Ohkubo,
I. Ohtake, M. Okamoto, S. Satoh, T. Satow,
S. Sudo, S. Tanahashi, K. Yamazaki, M. Fujiwara,
O. Motojima
National Institute for Fusion Science, Toki, Japan
Abstract. The Large Helical Device (LHD)
has successfully started running plasma confinement experiments
after a long construction period of eight years. During the construction and
machine commissioning phases, a variety of milestones were attained in fusion
engineering which successfully led to the first operation, and the first
plasma was ignited on 31 March 1998. Two experimental campaigns are planned in
1998. In the first campaign, the magnetic flux mapping clearly demonstrated a
nested structure of magnetic surfaces. The first plasma experiments were
conducted with second harmonic 84 and 82.6 GHz ECH at a heating power input of
0.35 MW. The magnetic field was set at 1.5 T in these campaigns so as to
accumulate operational experience with the superconducting coils. In the
second campaign, auxiliary heating with NBI at 3 MW has been carried
out. Averaged electron densities of up to
6×1019m- 3,
central temperatures ranging from 1.4 to 1.5 keV and stored energies of up to
0.22 MJ have been attained despite the fact that the impurity level has not
yet been minimized. The obtained scarling of energy confinement time has been
found to be consistent with the ISS95 scaling law with some enhancement.
IAEA 2001
