Development of a 2-D Method for Numerical Analysis of Dynamic and Magnetization Loss in Twisted, Stacked-Tape HTS Cables

Twisted, stacked-tape high-temperature superconducting cables, such as partitioned formervacuum pressure impregnated, insulated, partially transposed, extruded, and roll-formed (PIT-VIPER), have become key candidates for use in fusion magnet designs. Modeling ac loss in these cables, which typically contain four stacks of 60–100 tapes, presents a major challenge due to the high computational demands of 3-D simulations. In this work, we present a development of a 2-D scanning method, which divides the twisted geometry into multiple cross-sectional planes, achieving a considerable reduction in simulation time. The scanning method is thoroughly verified in the context of PIT-VIPER cables carrying dc current and exposed to an alternating magnetic field of up to 8 T at a temperature of 20 K. Models are implemented with H-$\phi $ formulation and contain up to 20 tapes per stack. For applied fields beyond the threshold value, the 2-D scanning shows excellent agreement with a 3-D reference model for magnetization and dynamic loss components, on average within 2%. Through careful selection of scan locations, it is possible to achieve high accuracy even with a small number of 2-D simulations. Although the 2-D method cannot fully capture the complex shielding effects in multitape stacks at low magnetic fields, it still provides reliable estimates of average loss per tape. The approach is also readily adaptable to other applications and cable architectures, including conductor on round core (CORC) and coaxial designs.