Investigation on Magnetic Hysteresis Loss of REBCO Twisted Stack Slotted-Core Cable for Fusion Magnet Application

In order to fulfil the demands of high current, high magnetic field and superior mechanical characteristics of high-field magnets for next generation fusion devices, the Institute of Plasma Physics, Chinese Academy of Sciences (ASIPP) has designed and developed a high-temperature superconducting Twisted Stack Slotted-Core Cable (TSSC). In this paper, the dependence of AC loss mainly about hysteresis loss induced by variations in the applied magnetic field is investigated by numerical simulations using the H formulation and the T-A formulation model, which are based on the finite element method (FEM). We initially study the hysteresis loss of a superconducting tape-stack to compare the computational results and efficiency of the two simulation models at 77 K. Additionally, hysteresis losses of TSSC cable at 4.2 K with different magnitudes and directions of the external magnetic field are calculated by the parametric scanning method. The results show that the T-A formulation model gives the same results as the H formulation model, but with a significant advantage in terms of the solving speed. Within a certain range of external field orientation, hysteresis loss increases with the growth of external magnetic field magnitude.