High-Speed Spin Testing of Bi-2212 Superconducting Wires for High-Field NMR Magnet Qualification: Final Progress Report

Abstract This paper summarizes an NIH-funded research project designed to study the strength of high temperature superconductors under circumferential hoop stress, in order qualify these materials for high-field (> 1 GHz-class) NMR magnets. The unique approach presented here is spin test coils at rotational speeds, approaching 50,000 rpm, induce mechanical stresses which are equivalent magnetic Lorentz experienced by a solenoid insert coil. Bi-2212 wires and were tested sub-cooled nitrogen determine if any damage was imparted each test. These preliminary experimental results demonstrate that, with further development, this could prove be simple method qualifying superconducting