@article{oai:nifs-repository.repo.nii.ac.jp:00010629,
 author = {TAKEIRI,  Yasuhiko and MORISAKI,  Tomohiko and OSAKABE,  Masaki and YOKOYAMA,  Masayuki and SAKAKIBARA,  Satoru and TAKAHASHI,  Hiromi and NAKAMURA,  Yukio and OISHI,  Tetsutarou and OISHI,  Tetsutaro and MOTOJIMA,  Gen and MURAKAMI,  Sadayoshi and ITOH,  Kimitaka and EJIRI,  Akira and Imagawa,  Shinsaku and INAGAKI,  Shigeru and ISOBE,  Mitsutaka and KUBO,  Shin and MASAMUNE,  Sadao and Mito,  Toshiyuki and MURAKAMI,  Izumi and NAGAOKA,  Kenichi and NAGAOKA, Ken-ichi and NAGASAKI,  Kazunobu and NISHIMURA,  Kiyohiko and Sakamoto,  Mizuki and SHIMOZUMA,  Takashi and SHINOHARA,  Kouji and SUGAMA,  Hideo and WATANABE,  Kiyomasa and Ahn, J.W. and Akata, Naofumi and AKIYAMA,  Tsuyoshi and ASHIKAWA,  Naoko and Baldzuhn,  J. and Bando, T. and Bernard, E. and Castejón, F. and Chikaraishi,  Hirotaka and EMOTO,  Masahiko and EVANS5,  Todd and Ezumi, N. and FUJII,  Keisuke and FUNABA,  Hisamichi and GOTO,  Motoshi and Gradic, D. and Gunsu, Y. and Hamaguchi, S. and HASEGAWA,  Hiroki and Hayashi, Y. and Hidalgo, C. and Higashiguchi, Takeshi and Hirooka, Y. and et, al.},
 issue = {10},
 journal = {Nuclear Fusion},
 month = {Aug},
 note = {0000-0001-7569-6717, 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, Ti and Te, 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 $\left\langle \beta \right\rangle $ . The high $\left\langle \beta \right\rangle $ 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.},
 title = {Extension of the operational regime of the LHD towards a deuterium experiment},
 volume = {57},
 year = {2017}
}