Contribution of the ion diamagnetic flow to poloidal rotation and pressure asymmetries in the SOL

摘要

Under typical conditions of high recycling divertor plasmas, the ion diamagnetic flow makes the largest contribution to the ion poloidal rotation in the SOL. Owing to toroidal effects, the net poloidal rotation in the SOL gives rise to ion parallel Pfirsch-Schluter flows, which are sustained by an up-down pressure asymmetry which reverses with toroidal field(Bφ) reversal. The up-down pressure asymmetry in turn gives rise to net, surface averaged, radial currents j~-_I arising from the surface averaging of local diamagnetic currents j_i = (1/rB)δ_p/δ_θ due to toroidal effects.