Parallel and perpendicular turbulence correlation length in the TJ-II Stellarator

被引：7
|
作者：
van Milligen, B. Ph. [1 ]
Lopez Fraguas, A. [1 ]
Pedrosa, M. A. [1 ]
Hidalgo, C. [1 ]
Martin de Aguilera, A. [1 ]
Ascasibar, E. [1 ]
机构：
[1] Asociac EURATOM CIEMAT Fus, Madrid 28040, Spain
来源：
NUCLEAR FUSION | 2013年 / 53卷 / 09期
关键词：
LONG-RANGE CORRELATIONS; PLASMA; IMPACT;
D O I：
10.1088/0029-5515/53/9/093025
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：
Long-range correlations were measured using two remote reciprocating Langmuir probe systems at TJ-II. The influence of the rotational transform on the correlation was studied by scanning the magnetic configuration. A simple drift-wave correlation model, assuming an exponential decay of the correlation with different correlation lengths in the directions parallel and perpendicular to the field lines, was found to describe the observations well at low densities. The experiment was repeated at gradually higher densities, and an additional correlation was detected at a critical value of the density. In accordance with previous work, this additional correlation was ascribed to zonal flows associated with a confinement transition. Thus, the total long-range correlation is found to be a sum of the drift wave and zonal flow contributions.
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页数：7
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