Regulation of electron temperature gradient turbulence by zonal flows driven by trapped electron modes

被引：9
作者：
Asahi, Y. [1 ]
Ishizawa, A. [2 ]
Watanabe, T. -H. [2 ]
Tsutsui, H. [1 ]
Tsuji-Iio, S. [1 ]
机构：
[1] Tokyo Inst Technol, Tokyo 1528550, Japan
[2] Natl Inst Fus Sci, Gifu 5095292, Japan
来源：
PHYSICS OF PLASMAS | 2014年 / 21卷 / 05期
关键词：
TRANSPORT; PLASMA; WAVES;
D O I：
10.1063/1.4875740
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：
Turbulent transport caused by electron temperature gradient (ETG) modes was investigated by means of gyrokinetic simulations. It was found that the ETG turbulence can be regulated by meso-scale zonal flows driven by trapped electron modes (TEMs), which are excited with much smaller growth rates than those of ETG modes. The zonal flows of which radial wavelengths are in between the ion and the electron banana widths are not shielded by trapped ions nor electrons, and hence they are effectively driven by the TEMs. It was also shown that an E x B shearing rate of the TEM-driven zonal flows is larger than or comparable to the growth rates of long-wavelength ETG modes and TEMs, which make a main contribution to the turbulent transport before excitation of the zonal flows. (C) 2014 AIP Publishing LLC.
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页数：10
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