Reduction of Ion Thermal Diffusivity Associated with the Transition of the Radial Electric Field in Neutral-Beam-Heated Plasmas in the Large Helical Device
- K. Ida
- H. Funaba
- S. Kado
- K. Narihara
- K. Tanaka
- Y. Takeiri
- Y. Nakamura
- N. Ohyabu
- K. Yamazaki
- M. Yokoyama
- S. Murakami
- N. Ashikawa
- P.C. deVries
- M. Emoto
- M. Goto
- H. Idei
- K. Ikeda
- S. Inagaki
- N. Inoue
- M. Isobe
- K. Itoh
- O. Kaneko
- K. Kawahata
- K. Khlopenkov
- A. Komori
- S. Kubo
- R. Kumazawa
- Y. Liang
- S. Masuzaki
- T. Minami
- J. Miyazawa
- T. Morisaki
- S. Morita
- T. Mutoh
- S. Muto
- Y. Nagayama
- H. Nakanishi
- K. Nishimura
- N. Noda
- T. Notake
- T. Kobuchi
- S. Ohdachi
- K. Ohkubo
- Y. Oka
- M. Osakabe
- T. Ozaki
- R.O. Pavlichenko
- B.J. Peterson
- A. Sagara
- K. Saito
- S. Sakakibara
- R. Sakamoto
- H. Sanuki
- H. Sasao
- M. Sasao
- K. Sato
- M. Sato
- T. Seki
- T. Shimozuma
- M. Shoji
- H. Suzuki
- S. Sudo
- N. Tamura
- K. Toi
- T. Tokuzawa
- Y. Torii
- K. Tsumori
- T. Yamamoto
- H. Yamada
- I. Yamada
- S. Yamaguchi
- S. Yamamoto
- Y. Yoshimura
- K.Y. Watanabe
- T. Watari
- Y. Hamada
- O. Motojima
- M. Fujiwara
Publication date
June 2001
DOI Publisher
American Physical Society (APS) ISSN
0031-9007 Journal
Physical Review LettersAbstract
Recent large helical device experiments revealed that the transition from ion root to electron root occurred for the first time in neutral-beam-heated discharges, where no nonthermal electrons exist. The measured values of the radial electric field were found to be in qualitative agreement with those estimated by neoclassical theory. A clear reduction of ion thermal diffusivity was observed after the mode transition from ion root to electron root as predicted by neoclassical theory when the neoclassical ion loss is more dominant than the anomalous ion loss
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