A superconducting pulse magnet for energy storage and its nonmetallic cryostat

The work is a step towards superconducting power applications e.g. diurnal storage. The energy of the vertically mounted solenoid coil is charged and discharged by a 6-pulse thyristor bridge. Filters are omitted in order to obtain high response of energy transfer. The ramping rate is about 8 T/s, and the central field is 2 T at 250 A. The superconducting wire has a diameter of 1.3 mm and a Cu/CuNi/NbTi mixed matrix for decreasing ac losses. Effective cooling is provided with spacers forming wide vertical cooling channels between layers. To minimize eddy current losses and to avoid excessive boiling of liquid helium a nonmetallic cryostat is used.