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.

引用

页数：9

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