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首页> 外文期刊>Plasma physics and controlled fusion >Impurity transport, turbulence transitions and intrinsic rotation in Alcator C-Mod plasmas
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Impurity transport, turbulence transitions and intrinsic rotation in Alcator C-Mod plasmas

机译：Alcator C-Mod等离子体中的杂质传输，湍流转变和固有旋转

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摘要

Linear and nonlinear gyrokinetic simulations are used to probe turbulent impurity transport in intrinsically rotating tokamak plasmas. For this simulation-based study, experimental input parameters are taken from a pair of ICRF heated Alcator C-Mod discharges exhibiting a change in the sign of the normalized toroidal rotation gradient at mid-radius (i.e. a change from hollow to peaked intrinsic rotation profiles). The simulations show that there is no change in the peaking of the calcium impurity between the plasmas with peaked and hollow rotation profiles, suggesting that the impurity transport and the shape of the rotation do not always change together. Furthermore, near mid-radius, r/a = 0.5 (normalized midplane minor radius), the linear and nonlinear gyrokinetic simulations exhibit no evidence of a transition from ion temperature gradient (ITG) to trapped electron mode dominance when the intrinsic rotation profile changes from peaked to hollow. Extensive nonlinear sensitivity analysis is performed, and there is no change in the ITG critical gradient or in the stiffness of ion heat transport with the change in the intrinsic toroidal rotation profile shape, which suggests that the shape of the rotation profile is not dominated by the ITG onset in these cases.
机译：线性和非线性陀螺动力学模拟用于探测固有旋转托卡马克等离子体中的湍流杂质传输。对于此基于仿真的研究，实验输入参数取自一对ICRF加热的Alcator C-Mod放电，该放电在中半径处具有归一化的环形旋转梯度的正负号变化（即，从空心旋转到峰值固有旋转轮廓）。模拟表明，在具有峰值和空心旋转轮廓的等离子体之间，钙杂质的峰值没有变化，这表明杂质的迁移和旋转的形状并不总是同时变化。此外，在中半径附近，r / a = 0.5（归一化的中平面短半径），线性和非线性的陀螺动力学模拟没有显示出当内在旋转轮廓从内在变化时从离子温度梯度（ITG）转变为俘获电子模式优势的证据。达到空心。进行了广泛的非线性灵敏度分析，并且随着固有环形旋转轮廓形状的变化，ITG临界梯度或离子传热的刚度也没有变化，这表明旋转轮廓的形状并不受主旋量的影响。在这些情况下，ITG发作。

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