Superconducting magnet system for operation at 13 K

For a superconducting magnet system with a superconducting magnet coil, which is wound from a superconducting wire at high critical temperature, such as for example a niobium-tin filament ambedded in a bronze matrix or niobium carbonitride layers on carrier fibres, where the magnet coil is cooled by a two-stage cryo-generator to working temperatures of about 130K, it is proposed that the current feed for the magnet coil should be via a flux pump. The flux pump consists of a transformer with primary winding and secondary winding and superconducting switches. The superconducting wires of the magnet coil, the transformer and the superconducting switches consist of a material of high critical temperature. (orig./GG)