3D numerical transport study of the edge ergodized plasma in TEXTOR-DED

Transport properties of the edge ergodized plasma in TEXTOR-DED (Finken K H and Wolf G H 1997 Fusion Eng. Des. 37 337) are studied using the 3D plasma edge transport code package, EMC3-EIRENE, prior to the forthcoming experimental campaign. EMC3 solves the steady-state plasma fluid equations of mass, momentum and energy, in almost any arbitrary 3D magnetic and bounding surface configurations. It is iteratively coupled with EIRENE, a 3D kinetic neutral particle transport code. Two different levels of ergodization have been selected in order to assess the additional effects of ergodicity on edge plasma transport. The code predicts a significant change in the radial profile of electron temperature for the higher ergodization and a pronounced correlation between the plasma flow fields and the magnetic field structure. The role of the (outermost) 'laminar zone' on the energy deposition pattern onto the divertor is analysed. It is found that its influence depends sensitively on the degree of ergodization achieved