Extension of the operational regime of the LHD towards a deuterium experiment

Y. Takeiri, T. Morisaki, M. Osakabe, M. Yokoyama, S. Sakakibara, H. Takahashi, Y. Nakamura, T. Oishi, G. Motojima, S. Murakami, K. Ito, A. Ejiri, S. Imagawa, Inagaki Shigeru, M. Isobe, S. Kubo, S. Masamune, T. Mito, I. Murakami, K. Nagaoka & 167 others K. Nagasaki, K. Nishimura, M. Sakamoto, R. Sakamoto, T. Shimozuma, K. Shinohara, H. Sugama, K. Y. Watanabe, J. W. Ahn, N. Akata, T. Akiyama, N. Ashikawa, J. Baldzuhn, T. Bando, E. Bernard, F. Castejón, H. Chikaraishi, M. Emoto, T. Evans, N. Ezumi, K. Fujii, H. Funaba, M. Goto, T. Goto, D. Gradic, Y. Gunsu, S. Hamaguchi, H. Hasegawa, Y. Hayashi, C. Hidalgo, T. Higashiguchi, Y. Hirooka, Y. Hishinuma, R. Horiuchi, K. Ichiguchi, K. Ida, T. Ido, H. Igami, K. Ikeda, S. Ishiguro, R. Ishizaki, A. Ishizawa, A. Ito, Y. Ito, A. Iwamoto, S. Kamio, K. Kamiya, O. Kaneko, R. Kanno, H. Kasahara, D. Kato, T. Kato, K. Kawahata, G. Kawamura, M. Kisaki, S. Kitajima, W. H. Ko, M. Kobayashi, S. Kobayashi, T. Kobayashi, Kazunori Koga, A. Kohyama, R. Kumazawa, J. H. Lee, D. López-Bruna, R. Makino, S. Masuzaki, Y. Matsumoto, H. Matsuura, O. Mitarai, H. Miura, J. Miyazawa, N. Mizuguchi, Chanho Moon, S. Morita, T. Moritaka, K. Mukai, T. Muroga, S. Muto, T. Mutoh, T. Nagasaka, Y. Nagayama, N. Nakajima, Y. Nakamura, H. Nakanishi, H. Nakano, M. Nakata, Y. Narushima, D. Nishijima, A. Nishimura, S. Nishimura, T. Nishitani, M. Nishiura, Y. Nobuta, H. Noto, M. Nunami, T. Obana, K. Ogawa, S. Ohdachi, M. Ohno, N. Ohno, H. Ohtani, M. Okamoto, Y. Oya, T. Ozaki, B. J. Peterson, M. Preynas, S. Sagara, K. Saito, H. Sakaue, A. Sanpei, S. Satake, M. Sato, T. Saze, O. Schmitz, R. Seki, T. Seki, I. Sharov, A. Shimizu, Masaharu Shiratani, M. Shoji, C. Skinner, R. Soga, T. Stange, C. Suzuki, Y. Suzuki, S. Takada, K. Takahata, A. Takayama, S. Takayama, Y. Takemura, Y. Takeuchi, H. Tamura, N. Tamura, H. Tanaka, K. Tanaka, M. Tanaka, T. Tanaka, Y. Tanaka, S. Toda, Y. Todo, K. Toi, M. Toida, M. Tokitani, T. Tokuzawa, H. Tsuchiya, T. Tsujimura, K. Tsumori, S. Usami, J. L. Velasco, H. Wang, T. H. Watanabe, T. Watanabe, J. Yagi, M. Yajima, H. Yamada, I. Yamada, O. Yamagishi, N. Yamaguchi, Y. Yamamoto, N. Yanagi, R. Yasuhara, E. Yatsuka, N. Yoshida, M. Yoshinuma, S. Yoshimura, Y. Yoshimura

Research output: Contribution to journal › Article

28 Citations (Scopus)

Abstract

As the finalization of a hydrogen experiment towards the deuterium phase, the exploration of the best performance of hydrogen plasma was intensively performed in the large helical device. High ion and electron temperatures, T i and T e, of more than 6 keV were simultaneously achieved by superimposing high-power electron cyclotron resonance heating onneutral beam injection (NBI) heated plasma. Although flattening of the ion temperature profile in the core region was observed during the discharges, one could avoid degradation by increasing the electron density. Another key parameter to present plasma performance is an averaged beta value . The high regime around 4% was extended to an order of magnitude lower than the earlier collisional regime. Impurity behaviour in hydrogen discharges with NBI heating was also classified with a wide range of edge plasma parameters. The existence of a no impurity accumulation regime, where the high performance plasma is maintained with high power heating >10 MW, was identified. Wide parameter scan experiments suggest that the toroidal rotation and the turbulence are the candidates for expelling impurities from the core region.

Original languageEnglish
Article number102023
JournalNuclear Fusion
Volume57
Issue number10
DOIs
Publication statusPublished - Aug 21 2017

Fingerprint

deuterium
ion temperature
impurities
heating
beam injection
hydrogen plasma
flattening
hydrogen
electron cyclotron resonance
temperature profiles
turbulence
electron energy
degradation

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Takeiri, Y., Morisaki, T., Osakabe, M., Yokoyama, M., Sakakibara, S., Takahashi, H., ... Yoshimura, Y. (2017). Extension of the operational regime of the LHD towards a deuterium experiment. Nuclear Fusion, 57(10), [102023]. https://doi.org/10.1088/1741-4326/aa7fc2

Extension of the operational regime of the LHD towards a deuterium experiment. / Takeiri, Y.; Morisaki, T.; Osakabe, M.; Yokoyama, M.; Sakakibara, S.; Takahashi, H.; Nakamura, Y.; Oishi, T.; Motojima, G.; Murakami, S.; Ito, K.; Ejiri, A.; Imagawa, S.; Shigeru, Inagaki; Isobe, M.; Kubo, S.; Masamune, S.; Mito, T.; Murakami, I.; Nagaoka, K.; Nagasaki, K.; Nishimura, K.; Sakamoto, M.; Sakamoto, R.; Shimozuma, T.; Shinohara, K.; Sugama, H.; Watanabe, K. Y.; Ahn, J. W.; Akata, N.; Akiyama, T.; Ashikawa, N.; Baldzuhn, J.; Bando, T.; Bernard, E.; Castejón, F.; Chikaraishi, H.; Emoto, M.; Evans, T.; Ezumi, N.; Fujii, K.; Funaba, H.; Goto, M.; Goto, T.; Gradic, D.; Gunsu, Y.; Hamaguchi, S.; Hasegawa, H.; Hayashi, Y.; Hidalgo, C.; Higashiguchi, T.; Hirooka, Y.; Hishinuma, Y.; Horiuchi, R.; Ichiguchi, K.; Ida, K.; Ido, T.; Igami, H.; Ikeda, K.; Ishiguro, S.; Ishizaki, R.; Ishizawa, A.; Ito, A.; Ito, Y.; Iwamoto, A.; Kamio, S.; Kamiya, K.; Kaneko, O.; Kanno, R.; Kasahara, H.; Kato, D.; Kato, T.; Kawahata, K.; Kawamura, G.; Kisaki, M.; Kitajima, S.; Ko, W. H.; Kobayashi, M.; Kobayashi, S.; Kobayashi, T.; Koga, Kazunori; Kohyama, A.; Kumazawa, R.; Lee, J. H.; López-Bruna, D.; Makino, R.; Masuzaki, S.; Matsumoto, Y.; Matsuura, H.; Mitarai, O.; Miura, H.; Miyazawa, J.; Mizuguchi, N.; Moon, Chanho; Morita, S.; Moritaka, T.; Mukai, K.; Muroga, T.; Muto, S.; Mutoh, T.; Nagasaka, T.; Nagayama, Y.; Nakajima, N.; Nakamura, Y.; Nakanishi, H.; Nakano, H.; Nakata, M.; Narushima, Y.; Nishijima, D.; Nishimura, A.; Nishimura, S.; Nishitani, T.; Nishiura, M.; Nobuta, Y.; Noto, H.; Nunami, M.; Obana, T.; Ogawa, K.; Ohdachi, S.; Ohno, M.; Ohno, N.; Ohtani, H.; Okamoto, M.; Oya, Y.; Ozaki, T.; Peterson, B. J.; Preynas, M.; Sagara, S.; Saito, K.; Sakaue, H.; Sanpei, A.; Satake, S.; Sato, M.; Saze, T.; Schmitz, O.; Seki, R.; Seki, T.; Sharov, I.; Shimizu, A.; Shiratani, Masaharu; Shoji, M.; Skinner, C.; Soga, R.; Stange, T.; Suzuki, C.; Suzuki, Y.; Takada, S.; Takahata, K.; Takayama, A.; Takayama, S.; Takemura, Y.; Takeuchi, Y.; Tamura, H.; Tamura, N.; Tanaka, H.; Tanaka, K.; Tanaka, M.; Tanaka, T.; Tanaka, Y.; Toda, S.; Todo, Y.; Toi, K.; Toida, M.; Tokitani, M.; Tokuzawa, T.; Tsuchiya, H.; Tsujimura, T.; Tsumori, K.; Usami, S.; Velasco, J. L.; Wang, H.; Watanabe, T. H.; Watanabe, T.; Yagi, J.; Yajima, M.; Yamada, H.; Yamada, I.; Yamagishi, O.; Yamaguchi, N.; Yamamoto, Y.; Yanagi, N.; Yasuhara, R.; Yatsuka, E.; Yoshida, N.; Yoshinuma, M.; Yoshimura, S.; Yoshimura, Y.

In: Nuclear Fusion, Vol. 57, No. 10, 102023, 21.08.2017.

Research output: Contribution to journal › Article

Takeiri, Y, Morisaki, T, Osakabe, M, Yokoyama, M, Sakakibara, S, Takahashi, H, Nakamura, Y, Oishi, T, Motojima, G, Murakami, S, Ito, K, Ejiri, A, Imagawa, S, Shigeru, I, Isobe, M, Kubo, S, Masamune, S, Mito, T, Murakami, I, Nagaoka, K, Nagasaki, K, Nishimura, K, Sakamoto, M, Sakamoto, R, Shimozuma, T, Shinohara, K, Sugama, H, Watanabe, KY, Ahn, JW, Akata, N, Akiyama, T, Ashikawa, N, Baldzuhn, J, Bando, T, Bernard, E, Castejón, F, Chikaraishi, H, Emoto, M, Evans, T, Ezumi, N, Fujii, K, Funaba, H, Goto, M, Goto, T, Gradic, D, Gunsu, Y, Hamaguchi, S, Hasegawa, H, Hayashi, Y, Hidalgo, C, Higashiguchi, T, Hirooka, Y, Hishinuma, Y, Horiuchi, R, Ichiguchi, K, Ida, K, Ido, T, Igami, H, Ikeda, K, Ishiguro, S, Ishizaki, R, Ishizawa, A, Ito, A, Ito, Y, Iwamoto, A, Kamio, S, Kamiya, K, Kaneko, O, Kanno, R, Kasahara, H, Kato, D, Kato, T, Kawahata, K, Kawamura, G, Kisaki, M, Kitajima, S, Ko, WH, Kobayashi, M, Kobayashi, S, Kobayashi, T, Koga, K, Kohyama, A, Kumazawa, R, Lee, JH, López-Bruna, D, Makino, R, Masuzaki, S, Matsumoto, Y, Matsuura, H, Mitarai, O, Miura, H, Miyazawa, J, Mizuguchi, N, Moon, C, Morita, S, Moritaka, T, Mukai, K, Muroga, T, Muto, S, Mutoh, T, Nagasaka, T, Nagayama, Y, Nakajima, N, Nakamura, Y, Nakanishi, H, Nakano, H, Nakata, M, Narushima, Y, Nishijima, D, Nishimura, A, Nishimura, S, Nishitani, T, Nishiura, M, Nobuta, Y, Noto, H, Nunami, M, Obana, T, Ogawa, K, Ohdachi, S, Ohno, M, Ohno, N, Ohtani, H, Okamoto, M, Oya, Y, Ozaki, T, Peterson, BJ, Preynas, M, Sagara, S, Saito, K, Sakaue, H, Sanpei, A, Satake, S, Sato, M, Saze, T, Schmitz, O, Seki, R, Seki, T, Sharov, I, Shimizu, A, Shiratani, M, Shoji, M, Skinner, C, Soga, R, Stange, T, Suzuki, C, Suzuki, Y, Takada, S, Takahata, K, Takayama, A, Takayama, S, Takemura, Y, Takeuchi, Y, Tamura, H, Tamura, N, Tanaka, H, Tanaka, K, Tanaka, M, Tanaka, T, Tanaka, Y, Toda, S, Todo, Y, Toi, K, Toida, M, Tokitani, M, Tokuzawa, T, Tsuchiya, H, Tsujimura, T, Tsumori, K, Usami, S, Velasco, JL, Wang, H, Watanabe, TH, Watanabe, T, Yagi, J, Yajima, M, Yamada, H, Yamada, I, Yamagishi, O, Yamaguchi, N, Yamamoto, Y, Yanagi, N, Yasuhara, R, Yatsuka, E, Yoshida, N, Yoshinuma, M, Yoshimura, S & Yoshimura, Y 2017, 'Extension of the operational regime of the LHD towards a deuterium experiment', Nuclear Fusion, vol. 57, no. 10, 102023. https://doi.org/10.1088/1741-4326/aa7fc2
Takeiri Y, Morisaki T, Osakabe M, Yokoyama M, Sakakibara S, Takahashi H et al. Extension of the operational regime of the LHD towards a deuterium experiment. Nuclear Fusion. 2017 Aug 21;57(10). 102023. https://doi.org/10.1088/1741-4326/aa7fc2
Takeiri, Y. ; Morisaki, T. ; Osakabe, M. ; Yokoyama, M. ; Sakakibara, S. ; Takahashi, H. ; Nakamura, Y. ; Oishi, T. ; Motojima, G. ; Murakami, S. ; Ito, K. ; Ejiri, A. ; Imagawa, S. ; Shigeru, Inagaki ; Isobe, M. ; Kubo, S. ; Masamune, S. ; Mito, T. ; Murakami, I. ; Nagaoka, K. ; Nagasaki, K. ; Nishimura, K. ; Sakamoto, M. ; Sakamoto, R. ; Shimozuma, T. ; Shinohara, K. ; Sugama, H. ; Watanabe, K. Y. ; Ahn, J. W. ; Akata, N. ; Akiyama, T. ; Ashikawa, N. ; Baldzuhn, J. ; Bando, T. ; Bernard, E. ; Castejón, F. ; Chikaraishi, H. ; Emoto, M. ; Evans, T. ; Ezumi, N. ; Fujii, K. ; Funaba, H. ; Goto, M. ; Goto, T. ; Gradic, D. ; Gunsu, Y. ; Hamaguchi, S. ; Hasegawa, H. ; Hayashi, Y. ; Hidalgo, C. ; Higashiguchi, T. ; Hirooka, Y. ; Hishinuma, Y. ; Horiuchi, R. ; Ichiguchi, K. ; Ida, K. ; Ido, T. ; Igami, H. ; Ikeda, K. ; Ishiguro, S. ; Ishizaki, R. ; Ishizawa, A. ; Ito, A. ; Ito, Y. ; Iwamoto, A. ; Kamio, S. ; Kamiya, K. ; Kaneko, O. ; Kanno, R. ; Kasahara, H. ; Kato, D. ; Kato, T. ; Kawahata, K. ; Kawamura, G. ; Kisaki, M. ; Kitajima, S. ; Ko, W. H. ; Kobayashi, M. ; Kobayashi, S. ; Kobayashi, T. ; Koga, Kazunori ; Kohyama, A. ; Kumazawa, R. ; Lee, J. H. ; López-Bruna, D. ; Makino, R. ; Masuzaki, S. ; Matsumoto, Y. ; Matsuura, H. ; Mitarai, O. ; Miura, H. ; Miyazawa, J. ; Mizuguchi, N. ; Moon, Chanho ; Morita, S. ; Moritaka, T. ; Mukai, K. ; Muroga, T. ; Muto, S. ; Mutoh, T. ; Nagasaka, T. ; Nagayama, Y. ; Nakajima, N. ; Nakamura, Y. ; Nakanishi, H. ; Nakano, H. ; Nakata, M. ; Narushima, Y. ; Nishijima, D. ; Nishimura, A. ; Nishimura, S. ; Nishitani, T. ; Nishiura, M. ; Nobuta, Y. ; Noto, H. ; Nunami, M. ; Obana, T. ; Ogawa, K. ; Ohdachi, S. ; Ohno, M. ; Ohno, N. ; Ohtani, H. ; Okamoto, M. ; Oya, Y. ; Ozaki, T. ; Peterson, B. J. ; Preynas, M. ; Sagara, S. ; Saito, K. ; Sakaue, H. ; Sanpei, A. ; Satake, S. ; Sato, M. ; Saze, T. ; Schmitz, O. ; Seki, R. ; Seki, T. ; Sharov, I. ; Shimizu, A. ; Shiratani, Masaharu ; Shoji, M. ; Skinner, C. ; Soga, R. ; Stange, T. ; Suzuki, C. ; Suzuki, Y. ; Takada, S. ; Takahata, K. ; Takayama, A. ; Takayama, S. ; Takemura, Y. ; Takeuchi, Y. ; Tamura, H. ; Tamura, N. ; Tanaka, H. ; Tanaka, K. ; Tanaka, M. ; Tanaka, T. ; Tanaka, Y. ; Toda, S. ; Todo, Y. ; Toi, K. ; Toida, M. ; Tokitani, M. ; Tokuzawa, T. ; Tsuchiya, H. ; Tsujimura, T. ; Tsumori, K. ; Usami, S. ; Velasco, J. L. ; Wang, H. ; Watanabe, T. H. ; Watanabe, T. ; Yagi, J. ; Yajima, M. ; Yamada, H. ; Yamada, I. ; Yamagishi, O. ; Yamaguchi, N. ; Yamamoto, Y. ; Yanagi, N. ; Yasuhara, R. ; Yatsuka, E. ; Yoshida, N. ; Yoshinuma, M. ; Yoshimura, S. ; Yoshimura, Y. / Extension of the operational regime of the LHD towards a deuterium experiment. In: Nuclear Fusion. 2017 ; Vol. 57, No. 10.
@article{27ace6f7b6084b2fa9657b829ed5228e,
title = "Extension of the operational regime of the LHD towards a deuterium experiment",
abstract = "As the finalization of a hydrogen experiment towards the deuterium phase, the exploration of the best performance of hydrogen plasma was intensively performed in the large helical device. High ion and electron temperatures, T i and T e, of more than 6 keV were simultaneously achieved by superimposing high-power electron cyclotron resonance heating onneutral beam injection (NBI) heated plasma. Although flattening of the ion temperature profile in the core region was observed during the discharges, one could avoid degradation by increasing the electron density. Another key parameter to present plasma performance is an averaged beta value . The high regime around 4{\%} was extended to an order of magnitude lower than the earlier collisional regime. Impurity behaviour in hydrogen discharges with NBI heating was also classified with a wide range of edge plasma parameters. The existence of a no impurity accumulation regime, where the high performance plasma is maintained with high power heating >10 MW, was identified. Wide parameter scan experiments suggest that the toroidal rotation and the turbulence are the candidates for expelling impurities from the core region.",
author = "Y. Takeiri and T. Morisaki and M. Osakabe and M. Yokoyama and S. Sakakibara and H. Takahashi and Y. Nakamura and T. Oishi and G. Motojima and S. Murakami and K. Ito and A. Ejiri and S. Imagawa and Inagaki Shigeru and M. Isobe and S. Kubo and S. Masamune and T. Mito and I. Murakami and K. Nagaoka and K. Nagasaki and K. Nishimura and M. Sakamoto and R. Sakamoto and T. Shimozuma and K. Shinohara and H. Sugama and Watanabe, {K. Y.} and Ahn, {J. W.} and N. Akata and T. Akiyama and N. Ashikawa and J. Baldzuhn and T. Bando and E. Bernard and F. Castej{\'o}n and H. Chikaraishi and M. Emoto and T. Evans and N. Ezumi and K. Fujii and H. Funaba and M. Goto and T. Goto and D. Gradic and Y. Gunsu and S. Hamaguchi and H. Hasegawa and Y. Hayashi and C. Hidalgo and T. Higashiguchi and Y. Hirooka and Y. Hishinuma and R. Horiuchi and K. Ichiguchi and K. Ida and T. Ido and H. Igami and K. Ikeda and S. Ishiguro and R. Ishizaki and A. Ishizawa and A. Ito and Y. Ito and A. Iwamoto and S. Kamio and K. Kamiya and O. Kaneko and R. Kanno and H. Kasahara and D. Kato and T. Kato and K. Kawahata and G. Kawamura and M. Kisaki and S. Kitajima and Ko, {W. H.} and M. Kobayashi and S. Kobayashi and T. Kobayashi and Kazunori Koga and A. Kohyama and R. Kumazawa and Lee, {J. H.} and D. L{\'o}pez-Bruna and R. Makino and S. Masuzaki and Y. Matsumoto and H. Matsuura and O. Mitarai and H. Miura and J. Miyazawa and N. Mizuguchi and Chanho Moon and S. Morita and T. Moritaka and K. Mukai and T. Muroga and S. Muto and T. Mutoh and T. Nagasaka and Y. Nagayama and N. Nakajima and Y. Nakamura and H. Nakanishi and H. Nakano and M. Nakata and Y. Narushima and D. Nishijima and A. Nishimura and S. Nishimura and T. Nishitani and M. Nishiura and Y. Nobuta and H. Noto and M. Nunami and T. Obana and K. Ogawa and S. Ohdachi and M. Ohno and N. Ohno and H. Ohtani and M. Okamoto and Y. Oya and T. Ozaki and Peterson, {B. J.} and M. Preynas and S. Sagara and K. Saito and H. Sakaue and A. Sanpei and S. Satake and M. Sato and T. Saze and O. Schmitz and R. Seki and T. Seki and I. Sharov and A. Shimizu and Masaharu Shiratani and M. Shoji and C. Skinner and R. Soga and T. Stange and C. Suzuki and Y. Suzuki and S. Takada and K. Takahata and A. Takayama and S. Takayama and Y. Takemura and Y. Takeuchi and H. Tamura and N. Tamura and H. Tanaka and K. Tanaka and M. Tanaka and T. Tanaka and Y. Tanaka and S. Toda and Y. Todo and K. Toi and M. Toida and M. Tokitani and T. Tokuzawa and H. Tsuchiya and T. Tsujimura and K. Tsumori and S. Usami and Velasco, {J. L.} and H. Wang and Watanabe, {T. H.} and T. Watanabe and J. Yagi and M. Yajima and H. Yamada and I. Yamada and O. Yamagishi and N. Yamaguchi and Y. Yamamoto and N. Yanagi and R. Yasuhara and E. Yatsuka and N. Yoshida and M. Yoshinuma and S. Yoshimura and Y. Yoshimura",
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TY - JOUR

T1 - Extension of the operational regime of the LHD towards a deuterium experiment

AU - Takeiri, Y.

AU - Morisaki, T.

AU - Osakabe, M.

AU - Yokoyama, M.

AU - Sakakibara, S.

AU - Takahashi, H.

AU - Nakamura, Y.

AU - Oishi, T.

AU - Motojima, G.

AU - Murakami, S.

AU - Ito, K.

AU - Ejiri, A.

AU - Imagawa, S.

AU - Shigeru, Inagaki

AU - Isobe, M.

AU - Kubo, S.

AU - Masamune, S.

AU - Mito, T.

AU - Murakami, I.

AU - Nagaoka, K.

AU - Nagasaki, K.

AU - Nishimura, K.

AU - Sakamoto, M.

AU - Sakamoto, R.

AU - Shimozuma, T.

AU - Shinohara, K.

AU - Sugama, H.

AU - Watanabe, K. Y.

AU - Ahn, J. W.

AU - Akata, N.

AU - Akiyama, T.

AU - Ashikawa, N.

AU - Baldzuhn, J.

AU - Bando, T.

AU - Bernard, E.

AU - Castejón, F.

AU - Chikaraishi, H.

AU - Emoto, M.

AU - Evans, T.

AU - Ezumi, N.

AU - Fujii, K.

AU - Funaba, H.

AU - Goto, M.

AU - Goto, T.

AU - Gradic, D.

AU - Gunsu, Y.

AU - Hamaguchi, S.

AU - Hasegawa, H.

AU - Hayashi, Y.

AU - Hidalgo, C.

AU - Higashiguchi, T.

AU - Hirooka, Y.

AU - Hishinuma, Y.

AU - Horiuchi, R.

AU - Ichiguchi, K.

AU - Ida, K.

AU - Ido, T.

AU - Igami, H.

AU - Ikeda, K.

AU - Ishiguro, S.

AU - Ishizaki, R.

AU - Ishizawa, A.

AU - Ito, A.

AU - Ito, Y.

AU - Iwamoto, A.

AU - Kamio, S.

AU - Kamiya, K.

AU - Kaneko, O.

AU - Kanno, R.

AU - Kasahara, H.

AU - Kato, D.

AU - Kato, T.

AU - Kawahata, K.

AU - Kawamura, G.

AU - Kisaki, M.

AU - Kitajima, S.

AU - Ko, W. H.

AU - Kobayashi, M.

AU - Kobayashi, S.

AU - Kobayashi, T.

AU - Koga, Kazunori

AU - Kohyama, A.

AU - Kumazawa, R.

AU - Lee, J. H.

AU - López-Bruna, D.

AU - Makino, R.

AU - Masuzaki, S.

AU - Matsumoto, Y.

AU - Matsuura, H.

AU - Mitarai, O.

AU - Miura, H.

AU - Miyazawa, J.

AU - Mizuguchi, N.

AU - Moon, Chanho

AU - Morita, S.

AU - Moritaka, T.

AU - Mukai, K.

AU - Muroga, T.

AU - Muto, S.

AU - Mutoh, T.

AU - Nagasaka, T.

AU - Nagayama, Y.

AU - Nakajima, N.

AU - Nakamura, Y.

AU - Nakanishi, H.

AU - Nakano, H.

AU - Nakata, M.

AU - Narushima, Y.

AU - Nishijima, D.

AU - Nishimura, A.

AU - Nishimura, S.

AU - Nishitani, T.

AU - Nishiura, M.

AU - Nobuta, Y.

AU - Noto, H.

AU - Nunami, M.

AU - Obana, T.

AU - Ogawa, K.

AU - Ohdachi, S.

AU - Ohno, M.

AU - Ohno, N.

AU - Ohtani, H.

AU - Okamoto, M.

AU - Oya, Y.

AU - Ozaki, T.

AU - Peterson, B. J.

AU - Preynas, M.

AU - Sagara, S.

AU - Saito, K.

AU - Sakaue, H.

AU - Sanpei, A.

AU - Satake, S.

AU - Sato, M.

AU - Saze, T.

AU - Schmitz, O.

AU - Seki, R.

AU - Seki, T.

AU - Sharov, I.

AU - Shimizu, A.

AU - Shiratani, Masaharu

AU - Shoji, M.

AU - Skinner, C.

AU - Soga, R.

AU - Stange, T.

AU - Suzuki, C.

AU - Suzuki, Y.

AU - Takada, S.

AU - Takahata, K.

AU - Takayama, A.

AU - Takayama, S.

AU - Takemura, Y.

AU - Takeuchi, Y.

AU - Tamura, H.

AU - Tamura, N.

AU - Tanaka, H.

AU - Tanaka, K.

AU - Tanaka, M.

AU - Tanaka, T.

AU - Tanaka, Y.

AU - Toda, S.

AU - Todo, Y.

AU - Toi, K.

AU - Toida, M.

AU - Tokitani, M.

AU - Tokuzawa, T.

AU - Tsuchiya, H.

AU - Tsujimura, T.

AU - Tsumori, K.

AU - Usami, S.

AU - Velasco, J. L.

AU - Wang, H.

AU - Watanabe, T. H.

AU - Watanabe, T.

AU - Yagi, J.

AU - Yajima, M.

AU - Yamada, H.

AU - Yamada, I.

AU - Yamagishi, O.

AU - Yamaguchi, N.

AU - Yamamoto, Y.

AU - Yanagi, N.

AU - Yasuhara, R.

AU - Yatsuka, E.

AU - Yoshida, N.

AU - Yoshinuma, M.

AU - Yoshimura, S.

AU - Yoshimura, Y.

PY - 2017/8/21

Y1 - 2017/8/21

N2 - As the finalization of a hydrogen experiment towards the deuterium phase, the exploration of the best performance of hydrogen plasma was intensively performed in the large helical device. High ion and electron temperatures, T i and T e, of more than 6 keV were simultaneously achieved by superimposing high-power electron cyclotron resonance heating onneutral beam injection (NBI) heated plasma. Although flattening of the ion temperature profile in the core region was observed during the discharges, one could avoid degradation by increasing the electron density. Another key parameter to present plasma performance is an averaged beta value . The high regime around 4% was extended to an order of magnitude lower than the earlier collisional regime. Impurity behaviour in hydrogen discharges with NBI heating was also classified with a wide range of edge plasma parameters. The existence of a no impurity accumulation regime, where the high performance plasma is maintained with high power heating >10 MW, was identified. Wide parameter scan experiments suggest that the toroidal rotation and the turbulence are the candidates for expelling impurities from the core region.

AB - As the finalization of a hydrogen experiment towards the deuterium phase, the exploration of the best performance of hydrogen plasma was intensively performed in the large helical device. High ion and electron temperatures, T i and T e, of more than 6 keV were simultaneously achieved by superimposing high-power electron cyclotron resonance heating onneutral beam injection (NBI) heated plasma. Although flattening of the ion temperature profile in the core region was observed during the discharges, one could avoid degradation by increasing the electron density. Another key parameter to present plasma performance is an averaged beta value . The high regime around 4% was extended to an order of magnitude lower than the earlier collisional regime. Impurity behaviour in hydrogen discharges with NBI heating was also classified with a wide range of edge plasma parameters. The existence of a no impurity accumulation regime, where the high performance plasma is maintained with high power heating >10 MW, was identified. Wide parameter scan experiments suggest that the toroidal rotation and the turbulence are the candidates for expelling impurities from the core region.

UR - http://www.scopus.com/inward/record.url?scp=85028463988&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85028463988&partnerID=8YFLogxK

U2 - 10.1088/1741-4326/aa7fc2

DO - 10.1088/1741-4326/aa7fc2

M3 - Article

VL - 57

JO - Nuclear Fusion

JF - Nuclear Fusion

SN - 0029-5515

IS - 10

M1 - 102023

ER -

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