Signatures of turbulence spreading during the H-L back-transition in TJ-II plasmas

被引：40
作者：
Estrada, T. [1 ]
Hidalgo, C. [1 ]
Happel, T. [1 ]
机构：
[1] CIEMAT, Asociac Euratom, Lab Nacl Fus, E-28040 Madrid, Spain
来源：
NUCLEAR FUSION | 2011年 / 51卷 / 03期
关键词：
ZONAL FLOWS; TRANSPORT; PROPAGATION; TOKAMAKS;
D O I：
10.1088/0029-5515/51/3/032001
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：
The spatio-temporal evolution of turbulence and plasma flows has been studied experimentally by means of Doppler reflectometry during the back-transition from the high to low confinement mode in the TJ-II stellarator. Signatures of spatial spreading of the turbulence are found inside the radial position of the sheared E x B flow as the H-L back-transition is approached. The results point to the possible role of radial spreading of turbulence in determining the width of transport barriers.
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