Manufacture and verification testing of low-resistance Nb3Sn joints for Cable-in-Conduit Conductors

摘要

Two coils using Nb3Sn Cable-in-Conduit Conductor (CICC) will be manufactured for assembly into the 45 T Hybrid Magnet at the National High Magnetic Field Laboratory (NHMFL). The design calls for low-resistance joints on the order of 1 nanoohm. Several joints were fabricated at Intermagnetics General Corporation (IGC) and tested at the Francis Bitter tested at the Francis Bitter National Magnet Laboratory (FBNML) to qualify the fabrication procedures and specifications. Two types of joints were tested: "praying hands" and "shorted-loop" joints. The joint design, fabrication procedures, modeling and tests are discussed. Test results are compared with the requirements of the 45 T system.