Numerical Investigation of Critical Current and Magnetization Loss Effect for Twisted Stacked Tape Cable Considering Field-Angle Dependency and Mechanical Torsion Degradation

Due to the higher thermal stability and the ability to be operated at liquid-helium-free temperature, the HTS cable show great promise for conduction-cooled tokamak magnet applications. However, the YBCO tapes embedded within the slot produce an axial strain, leading to a degradation in critical current. Meantime, the critical current is also strongly influenced by the field and its incidence angle on the tape. Understanding the impact of the coupled electromagnetic-mechanical effect on critical current degradation and magnetization loss is paramount. In this study, the coupling mechanical-electromagnetic critical current estimation model was first built based on the longitudinal strain model and tape its own in-field property. Subsequently, we analyze the DC critical current and the dynamic magnetization loss based on the 2D T-A model. Through the integration of the non-uniform magnetic field and longitudinal strain, the distribution of the critical current density could be evaluated. This enabled the complex current distribution and magnetization loss to be monitored effectively. The results of this study will be employed in the further optimization of CICC conductor in the future.