Oil-immersed 110-kv 440-kw rectifier unit

THE PROTON LINEAR ACCELERATOR installation at the University of Minnesota requires as one of its power supplies a d-c source capable of delivering continuously 4 amperes at 110 kv. This power represents the plate supply for four resnatron tubes which provide the radio-frequency power to excite the resonant cavities of the accelerator proper. The design of a power supply capable of meeting these requirements was complicated by the limited amount of available space.