  Within the framework of the National Special Project for Magnetic Confined
Nuclear Fusion Energy of China, the design of a superconducting magnet project
as a test facility of the Nb3Sn coil or NbTi coil for the Chinese Fusion
Engineering Test Reactor (CFETR) has been carried out not only to estimate the
relevant conductor performance but also to implement a background magnetic
field for CFETR CS insert and toroidal field (TF) insert coils. The
superconducting magnet is composed of two parts: the inner part with Nb3Sn
cable-in-conduit conductor (CICC) and the outer part with NbTi CICC. Both parts
are connected in series and powered by a single DC power supply. The
superconducting magnet can be cooled with supercritical helium at inlet
temperature of 4.5 K. The total inductance and stored energy of the
superconducting magnet are about 0.278 H and 436.6 MJ at an operating current
of 56 kA respectively. An active quench protection circuit was adopted to
transfer the stored magnetic energy of the superconducting magnet during a dump
operation. In this paper, the design of the superconducting magnet and the main
analysis results of the electromagnetic, structural and thermal-hydraulic
performance are described.
