Thermal Hydraulic Analysis of Background Magnet of 15T Conductor Performance Test Facility

The 15T Conductor Performance Test Facility (Super-X for short) is one of the comprehensive research facilities for fusion technology (CRAFT). The background magnet is wound by Nb3Sn cable-in-conduit conductors (CICC) with a maximum magnetic field of 15.6 T, and is cooled by 4.3 K supercritical helium forced flow. The background magnet needs to work in a liquid helium temperature environment, in this paper, according to the heat load and cooling loop layout of the background magnet, thermal hydraulic analysis was carried out on the background magnet under stable operation, excitation and quench conditions to ensure the cooling scheme is reasonable.