Toroidal Alfvén eigenmodes driven with ICRF accelerated protons in JT-60U negative shear discharges

Y. Kusama, H. Kimura, T. Ozeki, M. Saigusa, G. J. Kramer, T. Oikawa, S. Moriyama, M. Nemoto, T. Fujita, K. Tobita, G. Y. Fu, R. Nazikian, C. Z. Cheng

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41 引文 斯高帕斯(Scopus)

摘要

On JT-60U, for the first time in negative shear plasmas, toroidicity induced Alfvén eigenmodes (TAEs) with frequencies in the range of 90 to 110 kHz and toroidal mode numbers n = 5-8 were observed after a broadening of the density profile due to sequential partial collapses during ion cyclotron range of frequency (ICRF) heating. TAEs are more stable in negative shear plasmas than plasmas with a monotonically increasing q profile. The TAE stability was analysed with the NOVA-K code. It was found that the stability is highly sensitive to the gap alignment just inside qmin and that the theoretical results are consistent with the experimental results. In a weak central magnetic shear discharge, modes with very rapid frequency chirping were observed during ICRF heating. The frequencies of these modes rapidly increased from ∼30 kHz up to ∼110 kHz in a period of ∼150 ms. The large frequency chirping is not well understood by the present theory.

原文English
頁(從 - 到)1215-1223
頁數9
期刊Nuclear Fusion
38
發行號8
DOIs
出版狀態Published - 1998 十二月 1

All Science Journal Classification (ASJC) codes

  • 核能與高能物理
  • 凝聚態物理學

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