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arXiv 0903.2223physics.plasm-ph
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磁约束等离子体中的俘获、反常输运和准相干结构

Trapping, anomalous transport and quasi-coherent structures in magnetically confined plasmas

Madalina Vlad, Florin Spineanu

摘要:

磁约束等离子体中的强静电湍流的特征在于由$E\times B$随机漂移产生的粒子轨道的捕获或涡旋。捕获显示产生强烈的影响,测试粒子和测试模式。它确定轨迹的非标准统计:非高斯分布,记忆效应和相干性。俘获轨道形成准相干结构。轨道俘获对湍流等离子体的测试模式有很强的非线性影响。我们确定的背景湍流的统计特性的函数的漂移模式的增长率。我们发现,捕获提供的物理机制中观察到的逆级联漂移湍流和纬向流的产生。

英文摘要:

Strong electrostatic turbulence in magnetically confined plasmas is characterized by trapping or eddying of particle trajectories produced by the $E\times B$ stochastic drift. Trapping is shown to produce strong effects on test particles and on test modes. It determines non-standard statistics of trajectories: non-Gaussian distribution, memory effects and coherence. Trapped trajectories form quasi-coherent structure. Trajectory trapping has strong nonlinear effects on the test modes on turbulent plasmas. We determine the growth rate of drift modes as function of the statistical characteristics of the background turbulence. We show that trapping provides the physical mechanism for the inverse cascade observed in drift turbulence and for the zonal flow generation.

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