Hybrid magnets and cryogen-free superconducting magnets developed at the High-Field Laboratory for superconducting materials

Fundamental and application-oriented research for superconducting materials has been conducted as the main objective during the past 20 years at the High-Field Laboratory for Superconducting Materials, HFLSM, Institute for Materials Research, Tohoku University. A 30 T hybrid magnet proved to be a powerful experimental tool for high-temperature superconductors. Since HFLSM has succeeded in demonstrating the world's first practical cryogen-free superconducting magnet, CSM, using high-temperature superconducting current leads in 1992, various kinds of CSM have been developed for advanced uses. As a next step, we are developing a cryogen-free hybrid magnet, CHM, consisting of a cryogen-free wide bore superconducting magnet and a water-cooled resistive magnet. High-strength (Nb,Ti)₃Sn superconducting wires will be employed for CHM, in order to make a wide bore superconducting magnet as compactly as possible.