Dynamics of Secondary Large-Scale Structures in ETG Turbulence Simulations

被引：0
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作者：
李继全 [1 ]
YKISHIMOTO [2 ]
董家齐 [1 ]
NMIYATO [3 ]
TMATSUMOTO [3 ]
机构：
[1] Southwestern Institute of Physics,and SWIP-DUT Joint Lab for Fusion Plasma Physics,Chengdu ,China
[2] Department of Fundamental Energy,Kyoto University,- Gokasho,Uji,Japan Naka Fusion Research Establishment,JAERI,Naka,Ibaraki -,Japan
[3] Naka Fusion Research Establishment,JAERI,Naka,Ibaraki
来源：
Plasma Science and Technology. | 2006年 / 8卷 / 01期
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摘要：
<正> The dynamics of secondary large-scale structures in electron-temperature-gradient(ETG)turbulence is investigated based on gyrofluid simulations in sheared slab geometry.It isfound that structural bifurcation to zonal flow dominated or streamer-like states depends on thespectral anisotropy of turbulent ETG fluctuation,which is governed by the magnetic shear.Theturbulent electron transport is suppressed by enhanced zonal flows.However,it is still low even ifthe streamer is formed in ETG turbulence with strong shears.It is shown that the low transportmay be related to the secondary excitation of poloidal long-wavelength mode due to the beat waveof the most unstable components or a modulation instability.This large-scale structure with a lowfrequency and a long Wavelength may saturate,or at least contribute to the saturation of ETGfluctuations through a poloidal mode coupling.The result suggests a low fluctuation level in ETGturbulence.
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