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Impurity pinch generated by trapped particle driven turbulence

机译：被捕获的颗粒驱动湍流产生的杂质夹

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摘要

Impurity turbulent transport in tokamak plasmas is investigated in the case of trapped ion mode (TIM) and trapped electron mode (TEM) using a non-linear bounce-averaged gyrokinetic model. In particular, we focus on the thermo-diffusive pinch and the curvature-driven pinch observed in non-linear simulations. Thermodiffusion is analyzed independently of curvature pinch by disabling the latter artificially. A parameter scan shows that the direction of thermodiffusion depends mainly on two factors. First, it depends on the sign of the turbulence phase velocity, and the resulting transport is inward in the case of TEM whereas it is outward in the case of TIM. Second, it depends on the sign of the impurity temperature gradient. Moreover, the magnitude of the thermodiffusion tends to decrease with respect to the impurity charge Z, while it is proportional to the intensity of background turbulence. Lastly, the direction of the curvature pinch is investigated as a function of the magnetic shear. The results of non-linear simulations are compared with quasi-linear theory. The Kubo number is calculated for our non-linear simulations to justify this comparison. Quasi-linear theory is found to be in qualitative agreement with our gyrokinetic numerical observations.
机译：在捕获离子模式（TIM）和使用非线性反弹平均的旋转模型的捕获离子模式（TIM）和被捕获的电子模式（TEM）的情况下，研究了杂质湍流运输。特别是，我们专注于在非线性模拟中观察到的热漫射夹和曲率驱动的夹子。通过人为地禁用后者，独立地分析热处理。参数扫描表明，ThermoMiffusific的方向主要取决于两个因素。首先，取决于湍流相速度的迹象，并且在TEM的情况下，所得到的传输是向内的，而在蒂姆的情况下它是向外的。其次，这取决于杂质温度梯度的迹象。此外，热处理的大小倾向于相对于杂质电荷Z减小，而其与背景湍流的强度成比例。最后，作为磁性剪切的函数研究曲率夹切的方向。将非线性模拟结果与准线性理论进行比较。 Kubo号码用于我们的非线性模拟，以证明这种比较。拟线性理论被发现与我们的热能数值观察有所定性。

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