Heat deposition patterns on the target plates of the dynamic ergodic divertor

The dynamic ergodic divertor (DED) produces the perturbation field, which destroys the magnetic flux surfaces and creates an open chaotic system. The plasma boundary of the TEXTOR-DED contains two different domains: an ergodic and a laminar one. In this work we study the power deposition patterns produced by the DED on the divertor target plates by means of the thermography. The observed heat flux patterns consist of stripes parallel to the DED coils, which changes with the degree of ergodization. Each strike zone splits up into two parts at higher level of ergodization. The structure of the power fluxes is defined by the topology of the magnetic field in the edge.