We are reporting on the design of a compact capacitor charger with a rated output voltage of 50kV and a power rating of 10kJ/s. The input source is a 208V, 3-phase AC utility supply. The charger shall fit in to an 19inch, 5U enclosure. The core of the charger is a HV-power pack containing a high-frequency transformer with a nano-crystalline core, multiple output windings using litz-wire and integrated HV rectifiers. The primary of the transformer is driven by an H-bridge inverter with advanced IGBTs and matching High Power Drivers. The control is through a state-of-the-art Digital Signal Controller (DSC) with fast cycle-by-cycle Peak current mode control, leading edge blanking, and high resolution, fast, automated slope compensation for current loop stability. The DSC runs at 5 times the speed of the main processor core for ns level PWM resolution.