Zonal flows and long-distance correlations during the formation of the edge shear layer in the TJ-II stellarator

被引：10
|
作者：
Calvo, I. [1 ]
Carreras, B. A. [2 ]
Garcia, L. [2 ]
Pedrosa, M. A. [1 ]
Hidalgo, C. [1 ]
机构：
[1] CIEMAT, Asociac EURATOM, Lab Nacl Fus, E-28040 Madrid, Spain
[2] Univ Carlos III Madrid, Madrid 28911, Spain
来源：
PLASMA PHYSICS AND CONTROLLED FUSION | 2009年 / 51卷 / 06期
关键词：
GRADIENT-DRIVEN TURBULENCE; POLOIDAL FLOW; CONFINEMENT; TRANSPORT; GENERATION; EVOLUTION; TOKAMAK; PLASMA;
D O I：
10.1088/0741-3335/51/6/065007
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：
A theoretical interpretation is given for the observed long-distance correlations in potential fluctuations in TJ-II. The value of the correlation increases above the critical point of the transition for the emergence of the plasma edge shear flow layer. Mean (i.e. surface averaged, zero-frequency) sheared flows cannot account for the experimental results. A model consisting of four envelope equations for the fluctuation level, the mean flow shear, the zonal flow amplitude shear and the averaged pressure gradient is proposed. It is shown that the presence of zonal flows is essential to reproduce the main features of the experimental observations.
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页数：12
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