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

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