40 T class hybrid magnet system

Abstract We have already completed the fabrication, installation, cabling, and the piping of a 40 T class hybrid magnet system including a 15 MW DC power supply (430 V × 35 kA), 15 MW water-cooling system (inlet temperatures below 10°C, flow rates up to 800 t/h) helium liquefier/refrigerator, and a hybrid magnet composed of an outer superconducting magnet and an inner resistive magnet. Their test operations are progressing now. Except for the hybrid-mode test operations for the hybrid magnet system we have nearly completed all the other test operations. In this article we describe mainly the specifications of the hybrid magnet, the DC power supplies, total control system, water-cooling system, and the present situation of the test operation.