Divertor and vertical field power supplies for the TEXT upgrade

The Texas Experimental Tokamak (TEXT) is being upgraded to include an inner poloidal divertor coil set and a new vacuum vessel. A 400 V DC, 25000 A pulsed-power supply is required for the divertor coil set and a similarly rated supply is required for the vertical field coil set to provide in-out positioning of the plasma during divertor experiments. Two-quadrant 12-pulse convertors with bypass switches have been designed and built to utilize surplus pulse-rated rectifier transformers provided by Oak Ridge National Laboratory. A description of these supplies is given