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The topological and transport properties in the edge plasma of the dynamic ergodic divertor is studied to clarify the functionality of this type of helical divertor. The heat and particle fluxes at the DED target plates were measured with Langmuir probes. Peak fluxes are found where field lines end, which penetrate deep into the plasma. The comparison of the measured target profiles to the magnetic topology shows, that heat and particles are mainly transported to the target plates via flux tubes of short connection length. About 65% of the fluxes are found in areas, where field lines with a connection length of 1-2 poloidal turns connect to the target. Analysis of the source distribution shows, that about 40% of the ion sources lie inside the downstream area of the divertor. The high fraction of convective heat flux prevents from establishing high recycling in the divertor for the pulse type discussed here.

The DED at TEXTOR: Transport and Topological Properties of a Helical Divertor