Synchronization of Geodesic Acoustic Modes and Magnetic Fluctuations in Toroidal Plasmas

K. J. Zhao, Y. Nagashima, P. H. Diamond, J. Q. Dong, K. Itoh, S. I. Itoh, L. W. Yan, J. Cheng, A. Fujisawa, S. Inagaki, Y. Kosuga, M. Sasaki, Z. X. Wang, L. Wei, Z. H. Huang, D. L. Yu, W. Y. Hong, Q. Li, X. Q. Ji, X. M. SongY. Huang, Yi Liu, Q. W. Yang, X. T. Ding, X. R. Duan

研究成果: Contribution to journalArticle査読

12 被引用数 (Scopus)

抄録

The synchronization of geodesic acoustic modes (GAMs) and magnetic fluctuations is identified in the edge plasmas of the HL-2A tokamak. Mesoscale electric fluctuations (MSEFs) having components of a dominant GAM, and m/n=6/2 potential fluctuations are found at the same frequency as that of the magnetic fluctuations of m/n=6/2 (m and n are poloidal and toroidal mode numbers, respectively). The temporal evolutions of the MSEFs and the magnetic fluctuations clearly show the frequency entrainment and the phase lock between the GAM and the m/n=6/2 magnetic fluctuations. The results indicate that GAMs and magnetic fluctuations can transfer energy through nonlinear synchronization. Such nonlinear synchronization may also contribute to low-frequency zonal flow formation, reduction of turbulence level, and thus confinement regime transitions.

本文言語英語
論文番号145002
ジャーナルPhysical review letters
117
14
DOI
出版ステータス出版済み - 9 28 2016

All Science Journal Classification (ASJC) codes

  • 物理学および天文学(全般)

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