Zonal flow and GAM dynamics and associated transport characteristics in reversed shear tokamaks

Zonal flow and GAM dynamics and associated transport characteristics in reversed shear tokamaks
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反剪切托卡马克中的纬向流和 GAM 动力学及相关输运特性

DOI:
10.1017/s0022377806004946
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发表时间:
2006-12
影响因子:
2.5
通讯作者:
--
中科院分区:
物理与天体物理3区
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--
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通过静电离子温度梯度驱动湍流的全局模拟,研究了逆磁剪切托卡马克中的带流行为及其对湍流输运的影响。当安全系数$q$减小时,最小$q$区域的纬向流从振荡变为静止,有效抑制湍流输送。该结果表明最小$q$区域中层流行为的变化可能触发离子传输屏障的形成。
Zonal flow behaviour and its effect on turbulent transport in reversed magnetic shear tokamaks are investigated by global simulations of electrostatic ion temperature gradient driven turbulence. When the safety factor $q$ is reduced, zonal flows in a minimum $q$ region change from oscillatory to stationary and suppress the turbulent transport effectively. This result indicates that the change of zonal flow behaviour in the minimum $q$ region may trigger the formation of ion transport barriers.
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