Technical lay-out of the dynamic ergodic divertor

A description of the layout for the dynamic ergodic divertor (DED) is presented. It is proposed to install a perturbation coil system consisting of four quartets of coils and two compensation coils helically wound on the high field side of TEXTOR-94. The windings follow the magnetic field lines at q=3 surface for one toroidal turn. To obtain a static solution and a rotating field solution, the system can be operated at DC, 50 Hz and in the band between 1 and 10 kHz. As power supplies, convertor units using 4-quadrant bridges with IGBTs (insulated gate bipolar transistor) are foreseen. The required frequency synchronization of the units will be enforced by a central control unit.