Development of A 600 MHz wide bore (89 mm) NMR system using internal tin wires

Employing high performance internal-tin Nb₃Sn superconducting wire in NMR superconducting magnets, it is possible to reduce NMR magnet system cost. A 600 MHz NMR magnet system with 89 mm room temperature bore has been designed, constructed and is being tested. The magnet and cryostat were designed to meet existing 600 MHz NMR superconducting magnet standards. The design involved extensive mechanical analysis of stress/strain of the coils and coil forms. Construction also involved the development of superconducting joints. The magnet, which is cooled by liquid helium at 4.2 K, consists of three Nb₃Sn coils and five NbTi coils. The operating current, stored energy, outer diameter and the height of the whole system are 87.5 A, 2 MJ, 865 mm and 2020 mm, respectively. In this paper, an overview and analysis of the design is presented and preliminary test results are reported