Inclusion of poloidal potential variation in neoclassical transport

Abstract

Inclusion of the electrostatic potential is found to increase the electron neoclassical heat flux by an order of magnitude, while producing only a modest increase in the ion heat flux. The analysis is done for the plateau regime, though a similar behavior is expected in the banana regime. The poloidally varying potential, determined by quasineutrality, is predominantly due to ion Landau damping. The resulting E×B drift introduces terms into the electron heat flux that are comparable to those previously derived for the ion heat flux. Similar terms enter the particle flux, but here they cancel due to momentum balance.