Durable 70 T pulsed magnets

Abstract A research program for the development of a “75-class” pulsed user magnet has resulted in building pulsed magnets that ought to provide at least 100 pulses at the 70–75 T level. The design incorporates a new system for axial compression of the winding, high strength materials for both conductor and internal reinforcement and thermal optimization of winding. The coils consist of two sections: the inner section is made from high strength materials, while the outer section is made from soft copper for electrical efficiency and glass fibre composite for good insulation; this is supported by a thick-walled outer reinforcing shell made from carbon fibre composite. Two coils with inner bore of 10 mm were designed, manufactured and tested for field pulses up to 72 T with a rise time of order 4 ms, using our 10 kV, 0.5 MJ capacitor bank at a level of 380 kJ.