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Comparison of neoclassical predictions with measured flows and evaluation of a poloidal impurity density asymmetry

机译：新古典预测与测得流量的比较以及极性杂质密度不对称性的评估

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摘要

The study and prediction of velocities in the pedestal region of Alcator C-Mod are important for understanding plasma confinement and transport. In this study we examine the simplified neoclassical predictions for impurity flows using equations developed for plasmas with background ions in the Pfirsch-Schlüter (PS) (high collisionality) and banana (low collisionality) regimes. B~(5+) flow profiles for H-mode plasmas are acquired using the charge-exchange recombination spectroscopy diagnostic on Alcator C-Mod and are compared with calculated profiles for the region just inside the last closed flux surface. Reasonable agreement is found between the predictions from the PS regime formalism and the measured poloidal velocities for the steep gradient region of the H-mode pedestals, regardless of the collisionality of the plasma. The agreement is poorer between the neoclassical predictions and measured velocity profiles using the banana regime formalism. Additionally, comparisons of measured velocities from the low- and high-field sides (LFS and HFS) of the plasma lead us to infer the strong possibility of a poloidal asymmetry in the B~(5+) density. This asymmetry can be a factor of 2-3 for the region of the steepest gradients, with the density at the HFS being larger. The magnitude of the density asymmetry is found to be correlated with the magnitude of the poloidal velocity at the LFS of the plasma.
机译：研究和预测Alcator C-Mod基座区域的速度对于理解等离子体的约束和传输非常重要。在这项研究中，我们使用为Pfirsch-Schlüter（PS）（高碰撞性）和香蕉（低碰撞性）体系中具有背景离子的等离子体开发的方程，检查了杂质流的简化新古典预测。使用Alcator C-Mod上的电荷交换复合光谱诊断技术，获取H型等离子体的B〜（5+）流动轮廓，并将其与最后一个封闭通量表面内区域的计算轮廓进行比较。无论等离子体的碰撞性如何，在PS形式形式的预测与H模式基座陡峭梯度区域的测得的极向速度之间都找到了合理的一致性。新古典主义的预测与使用香蕉制度形式主义测得的速度剖面之间的一致性较差。另外，从等离子体的低场侧和高场侧（LFS和HFS）测得的速度的比较使我们推断出B〜（5+）密度极高的不对称性。对于最陡峭的梯度区域，这种不对称性可能是2-3的因数，而HFS处的密度更大。发现密度不对称的大小与等离子体的LFS处的极向速度的大小相关。

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