The design of cable-in-conduit conductors for the superconducting outsert coils of a 40 T hybrid magnet

Construction of a 40 T hybrid magnet system is in progress at the High Magnetic Field Laboratory, Chinese Academy of Sciences. The present design concept includes an 11 T superconducting magnet with a room temperature bore of 580 mm, a 29 T resistive magnet with a clear bore of 32 mm, and a 26 T resistive magnet with a clear bore of 50 mm. The total maximum field on axis in the 32 mm bore is 40 T, and in the 50 mm bore it is 37 T. The 11 T superconducting magnet will use a cable-in-conduit conductor (CICC). The high field magnet is made from Nb3Sn superconductor, and the low field magnet is made from NbTi superconductor. This paper describes the design concept of the cable-in-conduit conductor and the mechanical analysis of the jacket.