17 Tesla magnet with 300 mm outer diameter

A 17-T superconducting magnet was fabricated and tested. The designed field is 17 T with 160 A in the 33-mm bore at 4.2 K. The magnet is composed of two sets of Nb₃Sn coils and a NbTi coil graded into two sections. The Nb₃Sn conductor is a Ti added Nb tube processed conductor, reacted after coil winding. The conductor reaction process was developed to get 880 A/mm² current density without a matrix under 14.5 T and residual resistivity ratio of 87. The stabilization method applied to the coil was a flexibly supported epoxy resin impregnated coil without the mandrel. This method has been developed in the experiments and stress analysis of small NbTi and Nb ₃Sn coils. The current density for the NbTi coil reaches 260 A/mm² at 8.6 T, resulting in the compact system operated in a 300-mm-diameter cryostat. The maximum voltages at coil quenches were as high as 860 V, due to the low-current design