1. Recent Results in Large Helical Device
- Author
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Atsushi Mase, Masayuki Yokoyama, S. Morita, Kenji Tanaka, Hidenobu Takenaga, H. Funaba, Kazuya Takahata, Ryuhei Kumazawa, Y. Nagayama, M. Emoto, Yasuo Yoshimura, K. Yamazakia, Katsunori Ikeda, Shigeru Sudo, K. Nishimura, Takeshi Ido, Mitsutaka Isobe, A. Iwamoto, N. Noda, Atsushi J. Nishizawa, P. Goncharov, Kazumichi Narihara, Yasuji Hamada, Keisuke Matsuoka, Naoki Tamura, Shigeru Inagaki, Tokihiko Tokuzawa, Sadayoshi Murakami, Y. Nakamura, Takashi Notake, Ichihiro Yamada, H. Nozato, T. Watari, Masaki Osakabe, Shigeki Okajima, Takashi Minami, Tetsuo Seki, Tomohiro Morisaki, S. Iagawa, Suguru Masuzaki, Hajime Suzuki, Yuichiro Kogi, Hideya Nakanishi, A. Komori, T. Uda, Mamiko Sasao, Mizuki Sakamoto, Yoshiro Narushima, Katsuyoshi Tsumori, Nagato Yanagi, Osamu Kaneko, T. Kobuchi, Y. Yoshinuma, Ryuichi Sakamoto, Takashi Shimozuma, Motoshi Goto, Hirotaka Chikaraishi, K. Saito, Yoshihide Oka, Toshiyuki Mito, N. Ashikawa, Kazuo Kawahata, K.Y. Watanabe, Satoshi Ohdachi, Yuki Torii, Mutoh., Akio Sagara, B.J. Peterson, Akihiko Isayama, Shin Kubo, Arata Nishimura, Hiroshi Yamada, Kazuo Toi, Yasuhiko Takeiri, Mamoru Shoji, Katsumi Ida, Satoru Sakakibara, Sadatsugu Muto, J. Miyazawa, Osamu Motojima, Nobuyoshi Ohyabu, Hiroe Igami, Kuninori Sato, and T. Ozaki
- Subjects
Physics ,Large Helical Device ,Steady state ,Beta (plasma physics) ,Electron temperature ,Superconducting magnet ,Plasma ,Atomic physics ,Magnetohydrodynamics ,Fusion power ,equipment and supplies - Abstract
This paper presents recent experimental results in the Large Helical Device (LHD), which is the world largest helical system (Rax~3.6 m, aav~0.6 m, Bax~2.75 T) and has capability of steady state operation because of the superconducting magnets. LHD confines the plasma with Tio~2 keV and ne ~0.8times1019 m-3 for 1905 sec using the ICRF heating. In this case, the total plasma heating energy was ~1.3 GJ. This indicates that high energy ions generated by ICRF is well confined. Large magnetic island in the vacuum field due to the error field is vanished in plasma with higher temperature or with higher beta, so the error field is not an issue in helical systems. The obtained averaged beta is more than 4.3 % in LHD. Since the beta is not limited by the MHD events or magnetic island but the beta is limited by the lack of heating power, further improvement of beta can be expected. Internal and external transport barrier have been also observed, and the electron temperature and the ion temperature exceed 10 keV in the improved confinement mode in LHD. Besides the potential of the disruption free steady stated operation, LHD experiment accumulates evidences so that fusion reactor becomes more realistic
- Published
- 2005
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