Foil Conductor Model for Efficient Simulation of HTS Coils in Large Scale Applications

Homogenization techniques are an appealing approach to reduce computational complexity in systems containing coils with large numbers of high temperature superconductor (HTS) tapes. Resolving all the coated conductor layers and turns in coils is often computationally prohibitive. In this paper, we extend the foil conductor model, well-known in normal conducting applications, to applications with insulated HTS coils. To enhance the numerical performance of the model, the conventional formulation based on <inline-formula><tex-math notation="LaTeX">$A-V$</tex-math></inline-formula> is extended to <inline-formula><tex-math notation="LaTeX">$J-A-V$</tex-math></inline-formula>. The model is verified to be suitable for simulations of superconductors and to accelerate the calculations compared to resolving all the individual layers. The performance of both the <inline-formula><tex-math notation="LaTeX">$A-V$</tex-math></inline-formula> and <inline-formula><tex-math notation="LaTeX">$J-A-V$</tex-math></inline-formula> formulated models is examined, and the <inline-formula><tex-math notation="LaTeX">$J-A-V$</tex-math></inline-formula> variant is concluded to be advantageous.