Transition between saturation regimes of gyrokinetic turbulence.
Transition between saturation regimes of gyrokinetic turbulence.
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回旋湍流饱和状态之间的过渡。
DOI：
10.1103/physrevlett.111.175001
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发表时间：
2013
影响因子：
8.6
通讯作者：
Vasil Bratanov
中科院分区：
文献类型：
--
作者：
D. Hatch;F. Jenko;A. Navarro;Vasil Bratanov
利用磁化等离子体中离子温度梯度驱动湍流的回转动力学模型，研究了在较宽的驱动梯度和碰撞频率范围内，饱和湍流状态下自由能的注入、非线性再分布和碰撞耗散。无量纲参数L(T)/L(C)，其中L(T)是离子温度梯度标度长度，L(C)是碰撞平均自由程，它描述了在所有相空间维度中由自由能向小垂直(磁场)尺度的非线性转移为主的饱和区域和以大尺度耗散为主的区域之间的转变。
A gyrokinetic model of ion temperature gradient driven turbulence in magnetized plasmas is used to study the injection, nonlinear redistribution, and collisional dissipation of free energy in the saturated turbulent state over a broad range of driving gradients and collision frequencies. The dimensionless parameter L(T)/L(C), where L(T) is the ion temperature gradient scale length and L(C) is the collisional mean free path, is shown to parametrize a transition between a saturation regime dominated by nonlinear transfer of free energy to small perpendicular (to the magnetic field) scales and a regime dominated by dissipation at large scales in all phase space dimensions.