Scale lengths of inter-ELM fluctuations in the pedestal of ASDEX Upgrade

被引：5
|
作者：
Kurzan, B. [1 ]
Fuchs, C. [1 ]
Scarabosio, A. [1 ]
Scott, B. D. [1 ]
机构：
[1] EURATOM, Max Planck Inst Plasmaphys, D-85748 Garching, Germany
来源：
PLASMA PHYSICS AND CONTROLLED FUSION | 2009年 / 51卷 / 06期
关键词：
ALCATOR C-MOD; DIVERTOR TOKAMAK; TURBULENCE; EDGE; PLASMAS; TRANSPORT; COMPUTATION;
D O I：
10.1088/0741-3335/51/6/065009
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：
Fluctuations of electron density and temperature in the hot pedestal are investigated in-between type-I edge localized modes (ELMs) by high resolution, high precision Thomson scattering. The observed fluctuations of electron density and temperature are correlated and in phase. The amplitudes of these fluctuations become observable above a line-averaged electron density of about 4 x 10(19) m(-3). The heat transport in the pedestal is investigated by analysing the heat diffusivity. The experimentally found variations in the relative fluctuation amplitudes of electron density and temperature and of the heat diffusivity can be explained by different scale lengths of the underlying turbulence. The large fluctuations of electron density and temperature scale with a hybrid scale between ideal and resistive magneto-hydrodynamics, while the thermal transport occurs on the smallest scale lengths of the turbulence.
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页数：17
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