Neoclassical transport calculations using DKES code for W7-AS

Neoclassical transport theory predictions of ion heat conduction and bootstrap current are found to be consistent with experimental results in the case of Wendelstein 7-AS. For this device the DEGAS code estimates of the neoclassical particle fluxes agree in the higher density regime. Particle balance in NBI discharges is not affected by tangential NBI. The experimental electron heat transport exceeds significantly the neoclassical prediction. Only for low-density ECH discharges multiple roots for the radial electric field are predicted, while in other cases only the ion root (negative radial field) exists. 9 refs, 4 figs