Mesoscale electric fluctuations interacting with zonal flows, magnetic fluctuations and turbulence

Nuclear Fushion

article

K.J. Zhao¹  Y. Nagashima²  P.H. Diamond³  J.Q. Dong¹  K. Itoh⁵  S.-I. Itoh²  L.W. Yan¹  J. Cheng¹  A. Fujisawa²  S. Inagaki²  Y. Kosuga²  M. Sasaki²  Z.H. Huang¹  D.L. Yu¹  Q. Li¹  X.Q. Ji¹  X.M. Song¹  Y. Huang¹  Yi. Liu¹  Q.W. Yang¹  X.T. Ding¹  X.R. Duan¹  HL-2A team¹ 

[1] Southwestern Institute of Physics;Research Institute for Applied mechanics, Kyushu University;Center for Momentum Transport and Flow Organization, University of California at San Diego;Institute for Fusion Theory and Simulation, Zhejiang University;National Institute for Fusion Science;Institute of Science and Technology Research, Chubu University

关键词: magnetic fluctuations;    turbulence;    zonal flows;    mesoscale electric fluctuations;    nonlinear synchronization;   

DOI  :  10.1088/1741-4326/aa6f35

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

New mesoscale electric fluctuations (MSEFs) are identified in the edge plasmas of the HL-2A tokamak using multiple Langmuir probe arrays. The MSEFs, resulting from the synchronization and having components of dominant geodesic acoustic mode (GAM) andm / n   =  6/2 potential fluctuations, are found at the same frequency as that of the magnetic fluctuations ofm / n   =  6/2 ( mandnare 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 them / n   =  6/2 magnetic fluctuations. The results indicate that GAMs and magnetic fluctuations can transfer energy through nonlinear synchronization. The nonlinear coupling analyses show that the MSEFs couple to turbulence and low frequency zonal flows (LFZFs). This suggests that the MSEFs may contribute to the LFZF formation, reduction of turbulence level, and thus confinement regime transitions. The analysis of the envelope modulation demonstrates that both the MSEFs and the LFZFs modulate the turbulence while the MSEFs are modulated by the LFZFs.

【 授权许可】

Unknown