Superconducting magnet system for operation at 13k

Superconducting magnet system, comprising a cryostat having a cold shield, a superconducting magnet coil disposed in said cold shield, a two-stage cryogenerator connected to said magnet coil for cooling said magnet coil to an operating temperature substantially between 10 and 13 K., and a flux pump connected to said magnet coil for feeding current to said magnet coil, said flux pump including a transformer having primary and secondary windings and superconducting switches having conductors, said magnet coil, windings and conductors being formed of superconducting material having a high critical temperature, said secondary winding and at least one of said superconducting switches of said flux pump being formed of a continuous superconducting wire, at least one of said superconducting switches being part of said superconducting material of said magnet coil, said superconducting material having stabilizing copper disposed thereon being removed at said at least one switch, and a switch heater replacing said stabilizing copper at said at least one switch.