Development of superconductor and magnet design of 40 T class hybrid magnet

Construction of the 40 T class hybrid magnet system was completed at NRIM. The hybrid magnet will be able to generate the world's highest continuous magnetic field of 40 T class in a 30 mm clear bore. Generation of high magnetic field with the hybrid magnet causes serious problems due to large electromagnetic force. To handle the problems, the authors have developed new type (Nb,Ti)3Sn conductors, new coil clamp technique for 15 T class superconducting magnet, new copper alloy for 25T class polihelix-type water-cooled magnet and new manufacturing procedure which includes winding and machining process for water-cooled magnets through its research and development