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

Authors :
Takeshi Ido
Takeshi Higashiguchi
Noriyoshi Nakajima
M. Okamoto
Hideo Sugama
Hiroshi Yamada
Tsuyoshi Akiyama
Oliver Schmitz
Naoko Ashikawa
Shinsuke Satake
Masaharu Shiratani
Takashi Shimozuma
Kazuo Kawahata
M. Y. Tanaka
M. Ohno
Kazuo Toi
Shigeru Inagaki
Tetsuro Nagasaka
Shinji Hamaguchi
F. Castejón
Chihiro Suzuki
Arata Nishimura
J. Baldzuhn
M. Preynas
Masashi Kisaki
Hirohiko Tanaka
Y. Yamamoto
H. Miura
Takuya Saze
Y. Takemura
Yasunori Tanaka
Naofumi Akata
S. Morita
S. Sagara
Nobuaki Yoshida
Shinichiro Toda
Hisamichi Funaba
Osamu Yamagishi
Suguru Masuzaki
Ichihiro Yamada
Y. Takeuchi
Masaki Nishiura
Yutaka Matsumoto
José Luis Velasco
Kiyofumi Mukai
Yasuhiko Takeiri
Kazunori Koga
Motoshi Goto
Masanori Nunami
Arimichi Takayama
Chanho Moon
Ryuichi Sakamoto
Y. Hayashi
Ritoku Horiuchi
Hirotaka Chikaraishi
Seiji Ishiguro
Atsushi Ito
Yasuhiro Suzuki
Torsten Stange
R. Soga
Mieko Toida
Naoki Tamura
Kyosuke Shinohara
Hiroyuki A. Sakaue
Ryutaro Kanno
Hiroshi Kasahara
T. Kato
Gakushi Kawamura
Sadatsugu Takayama
K. Saito
Takeo Muroga
Seiya Nishimura
C. Skinner
Kensaku Kamiya
Sumio Kitajima
Katsuyoshi Tsumori
Tomohiro Morisaki
Izumi Murakami
Shin Kubo
K. Ito
Ryuhei Kumazawa
Shuji Kamio
Daisuke Nishijima
Masaki Osakabe
Juro Yagi
E. Bernard
Kazuya Takahata
Katsunori Ikeda
Osamu Mitarai
Motoki Nakata
Hiroyuki R. Takahashi
K. Nagaoka
Yuji Nakamura
Toseo Moritaka
Yasuhisa Oya
Hao Wang
N. Yamaguchi
Hayato Tsuchiya
Masayuki Yokoyama
Mizuki Sakamoto
Sadayoshi Murakami
Shinji Kobayashi
Akira Ejiri
Toshiyuki Mito
Suguru Takada
Masayuki Tokitani
I. A. Sharov
Mitsutaka Isobe
Sadatsugu Muto
Toru Ii Tsujimura
Daiji Kato
D. Gradic
Akihiro Ishizawa
Tsuguhiro Watanabe
R. Ishizaki
K.Y. Watanabe
C. Hidalgo
Shinsaku Imagawa
Keisuke Fujii
Ryohei Makino
Tokihiko Tokuzawa
Takashi Mutoh
Tetsuhiro Obana
Byron J. Peterson
M. Emoto
Hideya Nakanishi
Haruhisa Nakano
J.H. Lee
Sadao Masamune
Shinji Yoshimura
Yasushi Todo
Satoru Sakakibara
Teruya Tanaka
Mamoru Shoji
Katsumi Ida
Kenji Tanaka
Miyuki Yajima
T. Oishi
Shunsuke Usami
H. Noto
Akira Kohyama
Takuya Goto
Akio Sanpei
Yoshiro Narushima
Ryosuke Seki
Yasuo Yoshimura
A. Iwamoto
D. López-Bruna
Ryo Yasuhara
Yuji Nobuta
T. Kobayashi
Hiroki Hasegawa
Mikiro Yoshinuma
M. Sato
Naomichi Ezumi
K. Nishimura
Makoto I. Kobayashi
Hiroto Matsuura
Kazunobu Nagasaki
W.H. Ko
Yoshio Nagayama
Joon-Wook Ahn
E. Yatsuka
Yoshiki Hirooka
Naoki Mizuguchi
Nagato Yanagi
Tomo-Hiko Watanabe
Kunihiro Ogawa
Akihiro Shimizu
Osamu Kaneko
Katsuji Ichiguchi
Hitoshi Tamura
Gen Motojima
Tetsuo Seki
Takeo Nishitani
T. Bando
Y. Gunsu
Hiroaki Ohtani
Satoshi Ohdachi
J. Miyazawa
Hiroe Igami
Todd Evans
Yoshimitsu Hishinuma
Y. Ito
Noriyasu Ohno
T. Ozaki
Source :
Y. Takeiri et al 2017 Nucl. Fusion 57 102023, Nuclear Fusion
Publication Year :
2017
Publisher :
IOP Publishing, 2017.

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, 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.

Details

Language :
English
ISSN :
00295515
Volume :
57
Issue :
10
Database :
OpenAIRE
Journal :
Nuclear Fusion
Accession number :
edsair.doi.dedup.....06b1c2bee57ac76c5a82bc3824a66d12