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Synchronization of Geodesic Acoustic Modes and Magnetic Fluctuations in Toroidal Plasmas.
Zhao, K J; Nagashima, Y; Diamond, P H; Dong, J Q; Itoh, K; Itoh, S-I; Yan, L W; Cheng, J; Fujisawa, A; Inagaki, S; Kosuga, Y; Sasaki, M; Wang, Z X; Wei, L; Huang, Z H; Yu, D L; Hong, W Y; Li, Q; Ji, X Q; Song, X M; Huang, Y; Liu, Yi; Yang, Q W; Ding, X T; Duan, X R.
Afiliação
  • Zhao KJ; Southwestern Institute of Physics, P.O. Box 432, Chendu 610041, China.
  • Nagashima Y; Research Institute for Applied Mechanics, Kyushu University, Kasuga, Kasuga koen 6-1, 816-8580, Japan.
  • Diamond PH; Center for Momentum Transport and Flow Organization, University of California at San Diego, California, San Diego 92093, USA.
  • Dong JQ; Southwestern Institute of Physics, P.O. Box 432, Chendu 610041, China.
  • Itoh K; Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027, China.
  • Itoh SI; National Institute for Fusion Science, Toki 509-5292, Japan.
  • Yan LW; Research Institute for Applied Mechanics, Kyushu University, Kasuga, Kasuga koen 6-1, 816-8580, Japan.
  • Cheng J; Southwestern Institute of Physics, P.O. Box 432, Chendu 610041, China.
  • Fujisawa A; Southwestern Institute of Physics, P.O. Box 432, Chendu 610041, China.
  • Inagaki S; Research Institute for Applied Mechanics, Kyushu University, Kasuga, Kasuga koen 6-1, 816-8580, Japan.
  • Kosuga Y; Research Institute for Applied Mechanics, Kyushu University, Kasuga, Kasuga koen 6-1, 816-8580, Japan.
  • Sasaki M; Research Institute for Applied Mechanics, Kyushu University, Kasuga, Kasuga koen 6-1, 816-8580, Japan.
  • Wang ZX; Research Institute for Applied Mechanics, Kyushu University, Kasuga, Kasuga koen 6-1, 816-8580, Japan.
  • Wei L; School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China.
  • Huang ZH; School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China.
  • Yu DL; Southwestern Institute of Physics, P.O. Box 432, Chendu 610041, China.
  • Hong WY; Southwestern Institute of Physics, P.O. Box 432, Chendu 610041, China.
  • Li Q; Southwestern Institute of Physics, P.O. Box 432, Chendu 610041, China.
  • Ji XQ; Southwestern Institute of Physics, P.O. Box 432, Chendu 610041, China.
  • Song XM; Southwestern Institute of Physics, P.O. Box 432, Chendu 610041, China.
  • Huang Y; Southwestern Institute of Physics, P.O. Box 432, Chendu 610041, China.
  • Liu Y; Southwestern Institute of Physics, P.O. Box 432, Chendu 610041, China.
  • Yang QW; Southwestern Institute of Physics, P.O. Box 432, Chendu 610041, China.
  • Ding XT; Southwestern Institute of Physics, P.O. Box 432, Chendu 610041, China.
  • Duan XR; Southwestern Institute of Physics, P.O. Box 432, Chendu 610041, China.
Phys Rev Lett ; 117(14): 145002, 2016 Sep 30.
Article em En | MEDLINE | ID: mdl-27740841
ABSTRACT
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.
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Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2016 Tipo de documento: Article
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Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2016 Tipo de documento: Article