Effects of poloidal variation of neutral density on Pfirsch–Schlüter transport near the tokamak edge

Effects of neutral particles on plasma flows and radial transport in a collision-dominated plasma are discussed, with a particular attention given to the modifications due to a poloidal variation of the neutral density. It is found that neutrals are of no importance if the radial particle transport is on a Pfirsch–Schlüter level. If, on the other hand, anomalous effects increase this transport to the Pfirsch–Schlüter radial heat transport level or higher, neutral effects become important in determining the radial heat transport, radial electric field, and the ion parallel flow velocity.