Extension of high Te regime with upgraded ECRH system in the LHD

H. Takahashi, T. Shimozuma, S. Kubo, Y. Yoshimura, H. Igami, S. Ito, S. Kobayashi, Y. Mizuno, K. Okada, T. Mutoh, K. Nagaoka, S. Murakami, M. Osakabe, I. Yamada, H. Nakano, M. Yokoyama, T. Ido, A. Shimizu, R. Seki, K. IdaM. Yoshinuma, T. Kariya, R. Minami, T. Imai

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

2 被引用数 (Scopus)

抄録

Enhancement of the output power per gyrotron has been planned in the Large Helical Device (LHD). Three 77-GHz gyrotrons with an output power of more than 1 MW have been operated. In addition, a high power gyrotron with the frequency of 154 GHz (1 MW/5 s, 0.5 MW/CW) was newly installed in 2012 and the total injection power of ECRH reached 4.6 MW. The operational regime of ECRH plasma on the LHD has been extended due to the upgraded ECRH system such as the central electron temperature Te0 = 13.5 keV with ne= 1×1019m-3. In the LHD, an electron-internal- transport barrier (e-ITB) related to the production of high Te plasmas has been realized by strongly centre-focused ECRH. The electron thermal confinement clearly improved inside the e-ITB. The radial electric field was measured using the heavy ion beam probe. The formation of the positive E r was observed in the core region, which well agreed with the prediction of the neoclassical transport theory. The energy confinement characteristics have been investigated in the ECRH plasmas. It was found that higher plasma stored energy and lower radiation power was realized in the outward configuration. The plasma stored energy of 530 kJ with n e=3.2×1019m-3, which is the 1.7 times larger than the previous record in the ECRH plasma in the LHD, has been successfully achieved.

本文言語英語
ホスト出版物のタイトルRadiofrequency Power in Plasmas - Proceedings of the 20th Topical Conference
出版社American Institute of Physics Inc.
ページ145-152
ページ数8
ISBN(印刷版)9780735412101
DOI
出版ステータス出版済み - 2014
外部発表はい
イベント20th Topical Conference on Radiofrequency Power in Plasmas - Sorrento, イタリア
継続期間: 6 25 20136 28 2013

出版物シリーズ

名前AIP Conference Proceedings
1580
ISSN(印刷版)0094-243X
ISSN(電子版)1551-7616

その他

その他20th Topical Conference on Radiofrequency Power in Plasmas
Countryイタリア
CitySorrento
Period6/25/136/28/13

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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