Design updates and thermo-hydraulic analysis of K-DEMO CS magnets

Abstract The K-DEMO superconducting tokamak is being studied for the realization of the fusion plant since 2012. The preliminary design of the conductor of each magnet introduced in 2015 and the design are being updated for solving engineering issues. In the previous study, the K-DEMO CS(Central Solenoid) conductor was modified to reduce the number of the cooling channel. A central cooling spiral was applied to the CS conductor to minimize the pressure drop in a long cooling path and the shape of conductor was changed to square. This design change should guarantee to provide sufficient cooling conditions to reach the full flattop current under a wide range of conditions especially, the selected for the plasma ramp-up sequence development of CS coils. In this study, the updated CS conductor and coil design are presented. A CFX simulation carried out to check the pressure drop condition and a thermo-hydraulic analysis is performed.