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arXiv physics/0309015physics.plasm-phcond-mat
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等离子体turbulence输运的统计性质

Statistical properties of transport in plasma turbulence

Volker Naulin, Odd Erik Garcia, Anders Henry Nielsen, Jens Juul Rasmussen

摘要:

利用概率密度分布函数(PDF)研究了不同类型等离子体湍流模拟中$E \times B$通量的统计特性。包括在模型中的物理范围从二维漂移波湍流三维MHD模拟。通量表面平均输运的PDF与极值分布(EVD)吻合得很好。这被解释为一个本地化的旋涡结构占主导地位的通量表面上的运输签名。占本地输入的能量和包括全球背景的演变剖面的模型显示出更多的突发行为,以及交换和漂移型湍流的3D模拟的2D。虽然PDF不是高斯的,但也没有观察到代数尾。在所有考虑的情况下,尾部与EVD非常一致。

英文摘要:

The statistical properties of the $E \times B$ flux in different types of plasma turbulence simulations are investigated using probability density distribution functions (PDF). The physics included in the models ranges from two dimensional drift-wave turbulence to three dimensional MHD simulations. The PDFs of the flux surface averaged transport are in good agreement with an extreme value distribution (EVD). This is interpreted as a signature of localized vortical structures dominating the transport on a flux surface. Models accounting for a local input of energy and including the global evolution of background profiles show a more bursty behavior in 2D as well as 3D simulations of interchange and drift type turbulence. Although the PDFs are not Gaussian, again no algebraic tails are observed. The tails are, in all cases considered, in excellent agreement with EVDs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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