Turbulent transport of trapped-electron modes in collisionless plasmas.
Turbulent transport of trapped-electron modes in collisionless plasmas.
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DOI：
10.1103/physrevlett.103.085004
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发表时间：
2009-08
影响因子：
8.6
通讯作者：
Yong Xiao;Zhihong Lin
中科院分区：
文献类型：
--
作者：
Yong Xiao;Zhihong Lin
对环形等离子体中无碰撞囚禁电子模湍流的全局回转动力学粒子模拟发现，电子热输运呈现出从玻姆标度到回旋-玻姆标度的器件尺寸标度。空间和时间尺度的综合分析表明，由于纬向流切变，湍流涡旋主要是微观的，但由于激发线性不稳定性的进动共振的弱非线性失谐，中尺度结构的存在驱动了电子热通量中的非扩散分量。
Global gyrokinetic particle simulations of collisionless trapped-electron mode turbulence in toroidal plasmas find that electron heat transport exhibits a device size scaling with a gradual transition from Bohm to gyro-Bohm scaling. A comprehensive analysis of spatial and temporal scales shows that the turbulence eddies are predominantly microscopic because of zonal flow shearing, but the presence of mesoscale structures drives a nondiffusive component in the electron heat flux due to the weak nonlinear detuning of the precessional resonance that excites the linear instability.