Design of a superconducting 20 MJ induction coil

This paper presents the results of the detailed design and analyses of the 20 MJ superconducting induction heating coil. The coil is designed to store 20 MJ at 50 kA. The superconductor material is NbTi for a 7.5 tesla maximum field. The coil is designed to survive at least 100,000 cycles of full bipolar half cycle sinusoidal operation from +7.5 tesla to -7.5 tesla fields in one second. The analysis shows that the coil design will meet or exceed all of the performance requirements. The coil is designed to be mechanically rugged and manufacturable.