The role of magnetic shear for zonal flow generation
The role of magnetic shear for zonal flow generation
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DOI：
10.1017/s002237780600479x
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发表时间：
2006-09
影响因子：
2.5
通讯作者：
Johan Anderson;H. Nordman;Yasuaki Kishimoto
中科院分区：
文献类型：
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作者：
Johan Anderson;H. Nordman;Yasuaki Kishimoto
利用流体描述，解析地研究了磁切变对离子温度梯度和捕获电子(TE)模湍流所产生的纬向流的作用。考察了磁切变对带流增长率的标度，并与典型托卡马克参数值的线性增长率进行了比较。结果表明，在负磁剪切区，特别是TE模湍流驱动的ZF区，可以获得较大的ZF能级。TE模驱动的ZF的强磁剪切标度来源于电子磁漂移的反弹平均值。
The role of magnetic shear for zonal flow generation by ion temperature gradient and trapped electron (TE) mode turbulence is studied analytically using fluid descriptions. The scaling of the zonal flow (ZF) growth rate with magnetic shear is examined and compared with linear growth rates for typical tokamak parameter values. The results indicate that large levels of ZF are obtained in regions of negative magnetic shear, especially for ZF driven by TE mode turbulence. The strong magnetic shear scaling obtained for TE-mode-driven ZFs originates from the bounce average of the electron magnetic drifts.