1. Extension of operation regimes and investigation of three-dimensional currentless plasmas in the Large Helical Device
- Author
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P. Drewelow, Tomoaki Hino, Suguru Masuzaki, Yasuhiko Takeiri, Masaru Furukawa, Kiyofumi Mukai, Atsushi Okamoto, B. Wieland, T. Kato, Hisamichi Funaba, Masafumi Itagaki, D. S. Darrow, K. Nagaoka, Takeshi Ido, S. Morita, Xiaodi Du, Chihiro Suzuki, Tsuyoshi Akiyama, Nobuaki Yoshida, Shin Kajita, Noriyoshi Nakajima, M. Tingfeng, Daisuke Kuwahara, Hideo Sugama, M. W. Jakubowski, Satoshi Ohdachi, Kimitaka Itoh, Ryo Yasuhara, Naohiro Kasuya, Naoki Tamura, Ichihiro Yamada, T. Fukuda, Keiji Sawada, Kenji Tanaka, K. Saito, Kazutoshi Tokunaga, Samuel Lazerson, Masayuki Yokoyama, Tsuyoshi Imai, Shinji Yoshimura, H. Lee, Mikiro Yoshinuma, Masaki Osakabe, J. Miyazawa, Shin Kubo, M. Sato, Hiroaki Nakamura, N. A. Pablant, T. Oishi, Akinobu Matsuyama, Tomokazu Yoshinaga, K. Nishimura, Satoru Sakakibara, Hiroyuki Takahashi, Hiroshi Kasahara, Tomohiro Morisaki, Naomichi Ezumi, Y. Takemura, Yasuhisa Oya, T. Nakano, Hirohiko Tanaka, Shigeru Inagaki, Hiroshi Yamada, Nobuyoshi Ohyabu, Kazumichi Narihara, Shigeru Sudo, Hiroe Igami, Kazunori Koga, Takuya Goto, Hiroto Matsuura, Kazunobu Nagasaki, Yoshio Nagayama, Kazuya Takahata, Yoshio Ueda, Osamu Mitarai, A. Komori, I. A. Sharov, Hiroshi Idei, Mitsutaka Isobe, Yoshiro Narushima, Takeo Muroga, Akio Sagara, Naoko Ashikawa, Ryosuke Seki, Kensaku Kamiya, Tsuguhiro Watanabe, T. Ito, Ryuhei Kumazawa, Kazuo Toi, Motoshi Goto, Katsunori Ikeda, W. Guttenfelder, Fumihiro Koike, Hayato Tsuchiya, Shoji Yamamoto, Shinji Hamaguchi, M. Takeuchi, Hirotaka Chikaraishi, Katsuyoshi Tsumori, Sadayoshi Murakami, Y. Nakamura, Tetsuhiro Obana, Akira Ejiri, A. Murakami, Clive Michael, Sadatsugu Muto, S. E. Sharapov, S. Matsuoka, Leonid Vyacheslavov, Mamiko Sasao, Y. Hirooka, Seiya Nishimura, Tsuyoshi Kariya, Sumio Kitajima, Byron J. Peterson, Teruya Tanaka, Mamoru Shoji, Toshiyuki Mito, Keisuke Fujii, Tokihiko Tokuzawa, Takashi Mutoh, Katsumi Ida, Haruhisa Nakano, V.Y. Sergeev, Ryuichi Sakamoto, Masaki Nishiura, Kazuo Kawahata, Masayuki Tokitani, David Gates, Yasuhiro Suzuki, Hiroyuki A. Sakaue, Y. Asahi, Kuninori Sato, Izumi Murakami, Y. M. Nunami, Daiji Kato, Evgeny A. Drapiko, K.Y. Watanabe, Todd Evans, Masahiro Hasuo, M. Okamoto, Sanae I. Itoh, Hideya Nakanishi, Masahiko Emoto, A. W. Cooper, Yasushi Todo, Kobayashi, Masaharu Shiratani, Takashi Shimozuma, Yasuo Yoshimura, S. Yamada, A. Iwamoto, Nagato Yanagi, Tomo-Hiko Watanabe, D. R. Mikkelsen, Noriyasu Ohno, T. Ozaki, Katsuji Ichiguchi, Kunihiro Ogawa, Akihiro Shimizu, Osamu Kaneko, Hitoshi Tamura, Gen Motojima, Tetsuo Seki, and Shinsaku Imagawa
- Subjects
Nuclear and High Energy Physics ,Materials science ,Divertor ,Plasma ,Mechanics ,Edge (geometry) ,Fusion power ,Condensed Matter Physics ,Resonant magnetic perturbations ,Ion ,Large Helical Device ,Physics::Plasma Physics ,Beta (plasma physics) ,Atomic physics - Abstract
The progress of physical understanding as well as parameter improvement of net-current-free helical plasma is reported for the Large Helical Device since the last Fusion Energy Conference in Daejeon in 2010. The second low-energy neutral beam line was installed, and the central ion temperature has exceeded 7 keV, which was obtained by carbon pellet injection. Transport analysis of the high-T-i plasmas shows that the ion-thermal conductivity and viscosity decreased after the pellet injection although the improvement does not last long. The effort has been focused on the optimization of plasma edge conditions to extend the operation regime towards higher ion temperature and more stable high density and high beta. For this purpose a portion of the open helical divertors are being modified to the baffle-structured closed ones aimed at active control of the edge plasma. It is compared with the open case that the neutral pressure in the closed helical divertor increased by ten times as predicted by modelling. Studies of physics in a three-dimensional geometry are highlighted in the topics related to the response to a resonant magnetic perturbation at the plasma periphery such as edge-localized-mode mitigation and divertor detachment. Novel approaches of non-local and non-diffusive transport have also been advanced.
- Published
- 2013