Transition from chirping to steady NBI-driven Alfvén modes caused by magnetic configuration variations in the TJ-II stellarator

A. V. Melnikov, L. G. Eliseev, E. Ascasíbar, A. Cappa, F. Castejón, C. Hidalgo, T. Ido, J. A. Jiménez, A. S. Kozachek, L. I. Krupnik, M. Liniers, S. E. Lysenko, K. Nagaoka, J. L. De Pablos, A. Shimizu, S. E. Sharapov, M. V. Ufimtsev, S. Yamamoto

研究成果: Contribution to journalArticle査読

22 被引用数 (Scopus)

抄録

Beam-driven Alfvén eigenmodes (AEs) have been studied in the TJ-II low-magnetic-shear flexible heliac (B 0 = 0.95 T, R = 1.5 m, a = 0.22 m), in L-mode hydrogen plasmas with hydrogen NBI and ECR heating (P NBI 1.0 MW, E NBI = 32 keV, P ECRH 0.6 MW). In low-density plasmas in the range = (0.3-1.5) ×1019 m-3, a large variety of AEs have been observed in the plasma core with the heavy ion beam probe diagnostic and Mirnov coils, in the frequency range 50 kHz < f AE < 380 kHz. In experiments in which the vacuum rotational transform is varied during the shot (dynamic configuration scan), some AEs exhibit changes in their nonlinear evolution from bursting-amplitude AEs with chirping frequency to steady-frequency AEs, and back. The range of intervals within which the AEs studied are chirping or steady-state is determined.

本文言語英語
論文番号076001
ジャーナルNuclear Fusion
56
7
DOI
出版ステータス出版済み - 6 3 2016
外部発表はい

All Science Journal Classification (ASJC) codes

  • 核物理学および高エネルギー物理学
  • 凝縮系物理学

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