Sawtooth-triggered limit-cycle oscillations and I-phase in the HL-2A tokamak

K. J. Zhao, J. Cheng, P. H. Diamond, J. Q. Dong, L. W. Yan, W. Y. Hong, M. Xu, G. Tynan, K. Miki, Z. H. Huang, K. Itoh, S. I. Itoh, A. Fujisawa, Y. Nagashima, S. Inagaki, Z. X. Wang, L. Wei, X. M. Song, G. J. Lei, Q. LiX. Q. Ji, Yi Liu, Q. W. Yang, X. T. Ding, X. R. Duan

研究成果: ジャーナルへの寄稿学術誌査読

10 被引用数 (Scopus)

抄録

Transitions between low (L-mode) and intermediate (I-phase) confinement regimes triggered by sawteeth are investigated using multiple Langmuir probe arrays in the edge plasmas of the HL-2A tokamak. The I-phase is characterized by limit-cycle oscillations (LCOs). Repeated L-I-L transitions induced by sawtooth heat pulses are also observed. Statistical analyses show that the delay time of the L-I transition relative to sawtooth crashes is less than ∼1 ms. The intensity of turbulence bursts in the I-phase is stronger than those observed in L-mode plasmas. Measurements are consistent with zonal flow reducing turbulence intensity in the frequency band ∼20-100 kHz, while the LCO turbulence of frequency higher than 100 kHz has more power than that in the L-mode. The analyses of time-resolved power transfers between turbulence and zonal flows suggest that power transfers exist between turbulence and zonal flows. The direction of the power transfers is from turbulence into geodesic acoustic modes in ohmic plasmas.

本文言語英語
論文番号123015
ジャーナルNuclear Fusion
53
12
DOI
出版ステータス出版済み - 12月 2013

!!!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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