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 H igh-Field Laboratory for Superconducting Materials, HFLSM, Institute for Ma terials Research, Tohoku University. A 30T hybrid magnet proved to be a pow erful experimental tool for high-temperature superconductors. Since HFLSM h as succeeded in demonstrating the world's first practical cryogen-free supe rconducting magnet, CSM, using high-temperature superconducting current lea ds 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, consistin g of a cryogen-free wide bore superconducting magnet and a water-cooled res istive magnet. High-strength (Nb,Ti), Sn superconducting wires will be empl oyed for CHM, in order to make a wide bore superconducting magnet as compac tly as possible. (C) 2001 Elsevier Science B.V. All rights reserved.