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首页> 外文期刊>Plasma physics and controlled fusion >Effects of electron dynamics in toroidal momentum transport driven by ion temperature gradient turbulence
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Effects of electron dynamics in toroidal momentum transport driven by ion temperature gradient turbulence

机译:电子动力学对离子温度梯度湍流驱动的环形动量传输的影响

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摘要

Several issues in the toroidal angular momentum transport by the ion temperature gradient (ITG) turbulence are addressed in this work: the system size effect in the momentum transport, the symmetry breaking mechanism for the generation of the spontaneous rotation and the effect of the trapped electron dynamics. We find that the magnitude of the momentum flux scales with the system size according to the gyroBohm scaling, with no significant size effect on the radial structure of the perturbed toroidal angular momentum. The symmetry breaking due to the shear of the radial electric field is found to be a mechanism for generating the residual momentum flux. However, it is small compared with the momentum pinch term in the case of a finite background rotation. The trapped electrons in the ITG turbulence increase the intensity and modify the spectral properties of the electrostatic fluctuations, leading to the increase in the toroidal momentum pinch.
机译:这项工作解决了通过离子温度梯度(ITG)湍流在环形角动量传输中的几个问题:动量传输中的系统尺寸效应,自发旋转产生的对称破坏机制以及被俘获电子的影响动力学。我们发现,动量通量的大小与系统尺寸成比例,与陀螺波姆定标成比例,对扰动的环形角动量的径向结构没有明显的尺寸影响。发现由于径向电场的剪切而导致的对称破坏是用于产生残余动量通量的机制。但是,与有限的背景旋转情况下的动量收缩项相比,它很小。 ITG湍流中捕获的电子增加了强度并改变了静电涨落的光谱特性,从而导致了环形动量收缩的增加。

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