RHIC Gamma Transition Jump Power Supply prototype test

This paper describes the principle and test result of the prototype RHIC Gamma Transition Jump Power Supply. The jump power supply principle is introduced and illustrated with a diagram. The prototype is built with insulated gate bipolar transistors (IGBT) as current direction switch components. Optically coupled IGBT drives are used for the jump control switch. The jump time is synchronized from 40 to 60 millisecond to meet the RHIC beam transition-crossing requirement. The short jump time is needed to avoid particle loss and to preserve the initial bunch area during the transition, thus successfully transferring the ion beams from the acceleration RF system to the storage system. A total of twenty four jump power supplies will be used. They synchronously switch the direction of the magnets current while the beam is being accelerated through the transition to reach the top storage energy. Each power supply will energize a group of superconducting magnets, which consists of four magnets that connect in series. At the end, test results are listed, accompanied with the dummy load current waveform and prototype picture