First modelling of the textor ded near field divertor

摘要

As the first step in the modelling of the plasma-wall interaction of the proposed dynamic ergodic divertor(DED)of TEXTOR-94, the topology of the magnetic field lines of the divertor is analysed. Despite the strong ergodization, the magnetic field lines intersecting the wall in one poloidal turn form continuous sets. These sets visualized by a two dimensional(2-D)imaging technique; the field lines are traced poloidal turn clockwise and counter-clockwise from the outer midplane, marking those lines intersecting the wall. An overlay of the marked starting points defines areas with the properties of a scrape-off layer(SOL)and areas with field lines ending on one side in the ergodic layer and one side on the wall.