Neoclassical ion heat flux and poloidal flow in a tokamak pedestal

In the core of a tokamak, turbulent transport normally dominates over neoclassical.The situation could be different in a high confinement (or H) mode pedestal, where the former may be suppressed by a strongly sheared equilibrium electric field.On the other hand, this very field makes conventional neoclassical results inapplicable in the pedestal by significantly modifying ion drift orbits.We present the first calculation of the banana regime neoclassical ion heat flux and poloidal flow in the pedestal accounting for the strong ExB drift inherent to this tokamak region.Interestingly, we find that due to the electric field the pedestal poloidal ion flow can change its direction as compared to its core counterpart.This result elucidates the discrepancy between the conventional banana regime predictions and recent experimental measurements of the impurity flow performed at Alcator C-Mod.