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 language | English |
---|---|
Article number | 102023 |
Journal | Nuclear Fusion |
Volume | 57 |
Issue number | 10 |
DOIs | |
Publication status | Published - Aug 21 2017 |
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Condensed Matter Physics
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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.; Inagaki, S.; 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, K.; 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, 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, 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, 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, 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 › peer-review
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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 - Inagaki, S.
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, K.
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, C.
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, M.
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.
N1 - Funding Information: Author would like to thank all the LHD experiment group members, technical staff, and collaborators. This work is financially supported by NIFS LHD project fundings and Grant-in-Aid for Scientific Research by MEXT. Publisher Copyright: © 2017 IAEA, Vienna.
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
AN - SCOPUS:85028463988
VL - 57
JO - Nuclear Fusion
JF - Nuclear Fusion
SN - 0029-5515
IS - 10
M1 - 102023
ER -