Nature of transport across sheared zonal flows in electrostatic ion-temperature-gradient gyrokinetic plasma turbulence.
Nature of transport across sheared zonal flows in electrostatic ion-temperature-gradient gyrokinetic plasma turbulence.
复制标题
静电离子温度梯度回旋等离子体湍流中剪切带流的传输性质。
DOI：
10.1103/physrevlett.101.205002
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发表时间：
2008
影响因子：
8.6
通讯作者：
B. Carreras
中科院分区：
文献类型：
--
作者：
R. Sánchez;D. Newman;J. Leboeuf;V. Decyk;B. Carreras
It is shown that the usual picture for the suppression of turbulent transport across a stable sheared flow based on a reduction of diffusive transport coefficients is, by itself, incomplete. By means of toroidal gyrokinetic simulations of electrostatic, collisionless ion-temperature-gradient turbulence, it is found that the nature of the transport is altered fundamentally, changing from diffusive to anticorrelated and subdiffusive. Additionally, whenever the flows are self-consistently driven by turbulence, the transport gains an additional non-Gaussian character. These results suggest that a description of transport across sheared flows using effective diffusivities is oversimplified.
