Extension of operation regimes and investigation of three-dimensional currentless plasmas in the Large Helical Device
Kaneko, O.; Yamada, H.; Inagaki, S.; Jakubowski, M.; Kajita, S.; Kitajima, S.; Koga, K.; Morisaki, T.; Morita, S.; Mutoh, T.; Sakakibara, S.; Suzuki, Y.; Takahashi, H.; Tanaka, K.; Toi, K.; Yoshimura, Y.; Akiyama, T.; Asahi, Y.; Ashikawa, N.; Chikaraishi, H.; Cooper, A.; Darrow, D. S.; Drapiko, E.; Drewelow, P.; Du, X.; Ejiri, A.; Emoto, M.; Evans, T.; Ezumi, N.; Fujii, K.; Fukuda, T.; Funaba, H.; Furukawa, M.; Gates, D. A.; Goto, M.; Goto, T.; Guttenfelder, W.; Hamaguchi, S.; Hasuo, M.; Hino, T.; Hirooka, Y.; Ichiguchi, K.; Ida, K.; Idei, H.; Ido, T.; Igami, H.; Ikeda, K.; Imagawa, S.; Imai, T.; Isobe, M.; Itagaki, M.; Ito, T.; Itoh, K.; Itoh, S.; Iwamoto, A.; Kamiya, K.; Kariya, T.; Kasahara, H.; Kasuya, N.; Kato, D.; Kato, T.; Kawahata, K.; Koike, F.; Kubo, S.; Kumazawa, R.; Kuwahara, D.; Lazerson, S.; Lee, H.; Masuzaki, S.; Matsuoka, S.; Matsuura, H.; Matsuyama, A.; Michael, C.; Mikkelsen, D.; Mitarai, O.; Mito, T.; Miyazawa, J.; Motojima, G.; Mukai, K.; Murakami, A.; Murakami, I.; Murakami, S.; Muroga, T.; Muto, S.; Nagaoka, K.; Nagasaki, K.; Nagayama, Y.; Nakajima, N.; Nakamura, H.; Nakamura, Y.; Nakanishi, H.; Nakano, H.; Nakano, T.; Narihara, K.; Narushima, Y.; Nishimura, K.; Nishimura, S.; Nishiura, M.; Nunami, Y. M.; Obana, T.; Ogawa, K.; Ohdachi, S.; Ohno, N.; Ohyabu, N.; Oishi, T.; Okamoto, M.; Okamoto, A.; Osakabe, M.; Oya, Y.; Ozaki, T.; Pablant, N.; Peterson, B. J.; Sagara, A.; Saito, K.; Sakamoto, R.; Sakaue, H.; Sasao, M.; Sato, K.; Sato, M.; Sawada, K.; Seki, R.; Seki, T.; Sergeev, V.; Sharapov, S.; Sharov, I.; Shimizu, A.; Shimozuma, T.; Shiratani, M.; Shoji, M.; Sudo, S.; Sugama, H.; Suzuki, C.; Takahata, K.; Takeiri, Y.; Takemura, Y.; Takeuchi, M.; Tamura, H.; Tamura, N.; Tanaka, H.; Tanaka, T.; Tingfeng, M.; Todo, Y.; Tokitani, M.; Tokunaga, K.; Tokuzawa, T.; Tsuchiya, H.; Tsumori, K.; Ueda, Y.; Vyacheslavov, L.; Watanabe, K. Y.; Watanabe, T.; Watanabe, T. H.; Wieland, B.; Yamada, I.; Yamada, S.; Yamamoto, S.; Yanagi, N.; Yasuhara, R.; Yokoyama, M.; Yoshida, N.; Yoshimura, S.; Yoshinaga, T.; Yoshinuma, M.; Komori, A.
2013

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.

Details

Title Extension of operation regimes and investigation of three-dimensional currentless plasmas in the Large Helical Device
Author(s) Kaneko, O. ; Yamada, H. ; Inagaki, S. ; Jakubowski, M. ; Kajita, S. ; Kitajima, S. ; Koga, K. ; Morisaki, T. ; Morita, S. ; Mutoh, T. ; Sakakibara, S. ; Suzuki, Y. ; Takahashi, H. ; Tanaka, K. ; Toi, K. ; Yoshimura, Y. ; Akiyama, T. ; Asahi, Y. ; Ashikawa, N. ; Chikaraishi, H. ; Cooper, A. ; Darrow, D. S. ; Drapiko, E. ; Drewelow, P. ; Du, X. ; Ejiri, A. ; Emoto, M. ; Evans, T. ; Ezumi, N. ; Fujii, K. ; Fukuda, T. ; Funaba, H. ; Furukawa, M. ; Gates, D. A. ; Goto, M. ; Goto, T. ; Guttenfelder, W. ; Hamaguchi, S. ; Hasuo, M. ; Hino, T. ; Hirooka, Y. ; Ichiguchi, K. ; Ida, K. ; Idei, H. ; Ido, T. ; Igami, H. ; Ikeda, K. ; Imagawa, S. ; Imai, T. ; Isobe, M. ; Itagaki, M. ; Ito, T. ; Itoh, K. ; Itoh, S. ; Iwamoto, A. ; Kamiya, K. ; Kariya, T. ; Kasahara, H. ; Kasuya, N. ; Kato, D. ; Kato, T. ; Kawahata, K. ; Koike, F. ; Kubo, S. ; Kumazawa, R. ; Kuwahara, D. ; Lazerson, S. ; Lee, H. ; Masuzaki, S. ; Matsuoka, S. ; Matsuura, H. ; Matsuyama, A. ; Michael, C. ; Mikkelsen, D. ; Mitarai, O. ; Mito, T. ; Miyazawa, J. ; Motojima, G. ; Mukai, K. ; Murakami, A. ; Murakami, I. ; Murakami, S. ; Muroga, T. ; Muto, S. ; Nagaoka, K. ; Nagasaki, K. ; Nagayama, Y. ; Nakajima, N. ; Nakamura, H. ; Nakamura, Y. ; Nakanishi, H. ; Nakano, H. ; Nakano, T. ; Narihara, K. ; Narushima, Y. ; Nishimura, K. ; Nishimura, S. ; Nishiura, M. ; Nunami, Y. M. ; Obana, T. ; Ogawa, K. ; Ohdachi, S. ; Ohno, N. ; Ohyabu, N. ; Oishi, T. ; Okamoto, M. ; Okamoto, A. ; Osakabe, M. ; Oya, Y. ; Ozaki, T. ; Pablant, N. ; Peterson, B. J. ; Sagara, A. ; Saito, K. ; Sakamoto, R. ; Sakaue, H. ; Sasao, M. ; Sato, K. ; Sato, M. ; Sawada, K. ; Seki, R. ; Seki, T. ; Sergeev, V. ; Sharapov, S. ; Sharov, I. ; Shimizu, A. ; Shimozuma, T. ; Shiratani, M. ; Shoji, M. ; Sudo, S. ; Sugama, H. ; Suzuki, C. ; Takahata, K. ; Takeiri, Y. ; Takemura, Y. ; Takeuchi, M. ; Tamura, H. ; Tamura, N. ; Tanaka, H. ; Tanaka, T. ; Tingfeng, M. ; Todo, Y. ; Tokitani, M. ; Tokunaga, K. ; Tokuzawa, T. ; Tsuchiya, H. ; Tsumori, K. ; Ueda, Y. ; Vyacheslavov, L. ; Watanabe, K. Y. ; Watanabe, T. ; Watanabe, T. H. ; Wieland, B. ; Yamada, I. ; Yamada, S. ; Yamamoto, S. ; Yanagi, N. ; Yasuhara, R. ; Yokoyama, M. ; Yoshida, N. ; Yoshimura, S. ; Yoshinaga, T. ; Yoshinuma, M. ; Komori, A.
Published in Nuclear Fusion
Pagination 11
Volume 53
Issue 10
Pages 104015
Date 2013
Publisher Bristol, Iop Publishing Ltd
ISSN 0029-5515
DOI https://doi.org/10.1088/0029-5515/53/10/104015
Other identifier(s) View record in Web of Science
Laboratories CRPP
SPC
Record Appears in Scientific production and competences > SB - School of Basic Sciences > SPC - Swiss Plasma Center > SPC - Swiss Plasma Center
Peer-reviewed publications
Work produced at EPFL
Journal Articles
Published
Record creation date 2013-12-09

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