MAST中内禀转动反转对碰撞性的依赖性
Dependence of intrinsic rotation reversals on collisionality in MAST
摘要：
托卡马克等离子体即使在没有外部动量注入的情况下也会旋转。安装在MAST的多普勒后向散射系统允许在欧姆L-模式和H-模式等离子体中研究这种固有旋转，包括在球形托卡马克中首次观察到固有旋转反转。实验结果进行了比较，一个新的1D模型，它捕获的碰撞依赖的径向运输的环形角动量由于新古典流的湍流波动的影响。该模型是能够准确地再现的核心环向旋转的符号的变化，使用实验的密度和温度分布与旋转反转作为输入，没有自由参数适合实验数据。
英文摘要：
Tokamak plasmas rotate even without external injection of momentum. A Doppler backscattering system installed at MAST has allowed this intrinsic rotation to be studied in Ohmic L-mode and H-mode plasmas, including the first observation of intrinsic rotation reversals in a spherical tokamak. Experimental results are compared to a novel 1D model, which captures the collisionality dependence of the radial transport of toroidal angular momentum due to the effect of neoclassical flows on turbulent fluctuations. The model is able to accurately reproduce the change in sign of core toroidal rotation, using experimental density and temperature profiles from shots with rotation reversals as inputs and no free parameters fit to experimental data.
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