Lower hybrid current drive and higher harmonic ICRF heating experiments on JT-60

T. Imai, H. Kimura, Y. Kusama, K. Ushigusa, T. Fujii, Y. Ikeda, K. Tobita, S. M. Moriyama, S. Ide, K. Hamamatsu, M. Saigusa, O. Naito, M. Nemoto, K. Itami, M. Satou, S. Ishida

研究成果: Conference contribution

12 被引用数 (Scopus)

抄録

The paper describes the latest results and analysis of LHCD and ICRF heating experiments and beam induced instabilities on JT-60. A new multijunction LHCD launcher recorded current drive efficiency ηCD (≡n̄eRpIRF/PLH) of 3.4 × 1019 m-2·A·W-1 and extended current drive products (≡n̄eRpIRF) up to 12.5 × 1019 m-2·MA with approximately 4.5 MW LHCD power. Combination with neutral beams showed that the interaction between ions or electrons and lower hybrid waves is well explained by simple lower hybrid dispersion and showed evidence of N upshift. A simplified N upshift model explains experimental ηCD very well and predicts the achievement of the value necessary for ITER. Experimental results on third harmonic ICRF heating in combination with NBI heating and second harmonic minority heating are presented. In both cases, strong central heating by tail ion acceleration with higher harmonic ICRF waves occurs and giant sawteeth appear. In the former case, the sawtooth period reaches six times the energy confinement time and the energy confinement time is enhanced by 20% owing to fast ions. In the latter case, giant sawteeth appear even in the high density and low q regime (n̄e ≤ 6.5 × 1019 m-3 and qeff ≥ 2.6) with relatively small threshold ICRF power (approximately 2 MW).

本文言語English
ホスト出版物のタイトルProc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res
出版社Publ by IAEA
ページ645-657
ページ数13
ISBN(印刷版)9201300913
出版ステータスPublished - 1991
外部発表はい

出版物シリーズ

名前Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res

ASJC Scopus subject areas

  • 工学(全般)

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