Design and Test Results of 18.1 T Cryocooled Superconducting Magnet With Bi2223 Insert

An 18 T cryocooled superconducting magnet (18T-CSM) with a 52-mm room temperature bore has been successfully constructed. The magnet consists of an outer NbTi coil, which generates 6.2 T, four Nb3Sn coils, which generate 9.3 T and a Bi2223 high-Tc insert coil, which generates 2.5 T. The magnet system is cooled by a GM/JT cryocooler and two single-stage GM cryocoolers. The initial cool down takes 1...