Study of CERC using newly installed 77 GHz gyrotron in LHD

H. Takahashi, T. Shimozuma, M. Yokoyama, T. Ido, S. Kubo, A. Shimizu, Y. Yoshimura, H. Igami, T. Mutoh

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

抄録

We have investigated the transition to Core Electron-Root Confinement (CERC) using the 77 GHz ECRH system, which was newly installed in the Large Helical Device (LHD). The focal point scan of the ECRH was carried out shot by shot in the same poloidal surface along the magnetic field of 2.75 T, which is the fundamental resonance surface for 77 GHz ECRH. The formation of the steep gradient in the electron temperature and the change of the radial electric field from negative to positive value in the plasma core region were observed by the ECRH injection to ρ<0.5. The foot point of the peaked profile of the electron temperature appeared near the m/n=2/1 rational surface, which was located at ρ∼0.5. These results imply that localized ECRH in the inner region within the lower order rational surface and/or the electron heat flux across the rational surface play important roles for the transition to CERC. We also confirmed that the calculated radial electric field from a neoclassical theory qualitatively agreed with the experimental results.

本文言語英語
ホスト出版物のタイトルRadio Frequency Power in plasmas - Proceedings of the 18th Topical Conference
ページ487-490
ページ数4
DOI
出版ステータス出版済み - 2009
外部発表はい
イベント18th Topical Conference on Radio Frequency Power in plasmas - Gent, ベルギー
継続期間: 6 24 20096 26 2009

出版物シリーズ

名前AIP Conference Proceedings
1187
ISSN(印刷版)0094-243X
ISSN(電子版)1551-7616

その他

その他18th Topical Conference on Radio Frequency Power in plasmas
Countryベルギー
CityGent
Period6/24/096/26/09

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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