Coherent structures in ion temperature gradient turbulence-zonal flow

被引：15
|
作者：
Singh, Rameswar [1 ,2 ]
Singh, R. [2 ,3 ]
Kaw, P. [2 ]
Guercan, Oe. D. [1 ]
Diamond, P. H. [3 ,4 ,5 ]
机构：
[1] Ecole Polytech, Plasma Phys Lab, F-91128 Palaiseau, France
[2] Inst Plasma Res, Bhat 382428, Gandhinagar, India
[3] Natl Fus Res Inst, WCI Ctr Fus Theory, Taejon 305333, South Korea
[4] Univ Calif San Diego, CMTFO, San Diego, CA 92093 USA
[5] Univ Calif San Diego, CASS, San Diego, CA 92093 USA
来源：
PHYSICS OF PLASMAS | 2014年 / 21卷 / 10期
基金：
新加坡国家研究基金会;
关键词：
DRIFT-WAVE TURBULENCE; PLASMA EDGE; TRANSPORT; DYNAMICS; AMPLIFICATION; INTERMITTENCY; FLUCTUATIONS; GENERATION; PARADIGM;
D O I：
10.1063/1.4898207
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
Nonlinear stationary structure formation in the coupled ion temperature gradient (ITG)-zonal flow system is investigated. The ITG turbulence is described by a wave-kinetic equation for the action density of the ITG mode, and the longer scale zonal mode is described by a dynamic equation for the m = n = 0 component of the potential. Two populations of trapped and untrapped drift wave trajectories are shown to exist in a moving frame of reference. This novel effect leads to the formation of nonlinear stationary structures. It is shown that the ITG turbulence can self-consistently sustain coherent, radially propagating modulation envelope structures such as solitons, shocks, and nonlinear wave trains. (C) 2014 AIP Publishing LLC.
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收藏
页数：9
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