Resonant power supplies for a rapid-cycling accelerator

A resonant power supply has been proposed as an efficient power supply for a future 60 GeV, kaon-producing accelerator. This report presents a detailed analysis of the circuit operation. Based on these analyses each component is designed, one-line diagram is developed, component requirements are determined and a detailed cost estimate is prepared. The major components of the system are: the magnet power supply, high-voltage by-pass thyristor switch, with 10-kA repetitive interruption capability, capacitor banks, capacitor bank thyristor switch, and an energy make-up device. The most important components are the bypass thyristor switch and the energy injection device. The bypass thyristor switch is designed to turn on and interrupt 10-kA dc current with a recovery voltage of 20kV and repetition frequency of 3 Hz. The switch consists of a large array of series- and parallel-connected thyristors and gate turn-off (GTO) devices. The make-up energy device is designed to replace the circuit energy losses. A capacitor bank is charged with constant current and discharged during the acceleration period. One of the advantages of the developed circuit is that it can be supplied directly from the local power network. In order to prove the validity of the assumptions, a scaled-down model circuit was thoroughly tested. These tests proved that the engineering design of critical components is correct and this resonant power supply can be properly controlled by an inverter/rectifier connected in series with the magnet and by the make-up energy device. This finding reduces the system cost. The cost estimate shows that the power supplies can be built for under $56M and that the expected yearly operation cost will be on the order of $4-8M. It is expected that this design and cost estimate will serve as a baseline which permits easy redesign of the system and fast reestimation of the cost in case of change in requirements.