Cable Modeling and DC Resistance Analysis of Terminations for 16 T Superconductor Test Facility

For the next generation fusion reactor called K-DEMO, a project of constructing 16 T (Tesla) superconducting conductor test facility, named SUCCEX (SUper Conducting Conductor EXperiment), is currently underway. It would generate the maximum magnetic field of 16 T to develop and test the superconducting magnet for K-DEMO. The SUCCEX coil system consists of a split-pair solenoid magnet, and each magnet is divided into two concentric coils, called IC (Inner Coil) and OC (Outer Coil). The IC and the OC are connected by lap joint to supply current from a power supply to the superconducting magnet. A major challenge is finding a simple and low-resistive joint design. In this study, the design and DC resistance calculation of the joint were performed including a cabling simulation. Finite element analysis method was used for the calculation of contact area of the Nb3Sn strands and Cu sole, and the relationship between the calculated contact resistance and pressing depth of piston was derived. The optimal design of the joints was proposed, and the calculated DC resistance was 0.82 n-Ohm.