Transport modelling of TEXTOR-DED laminar zone

In the case of a strong ergodisation of the plasma edge of TEXTOR-DED, the edge magnetic field forms an extended laminar zone, which is established by magnetic held lines with short connection lengths (open ergodic system). I n the laminar zone the parallel transport can compete with the cross-field transport and the situation is similar to that in a regular divertor. For a n analysis of the generic effects of the laminar zone on the plasma transpo rt, the LUPUS code is developed taking flux tubes with short connection len gths into account. The ergodic zone with rather high connection lengths is described by enhanced perpendicular diffusion coefficients. As important re sults, which differ significantly from common SOL's, the expected power loa d and the flow pattern to the plasma facing components are presented. (C) 2 001 Elsevier Science B.V. All rights reserved.