Finite Element Method simulation of AC loss in HTS tapes with B-dependent E-J power law

The nonlinear behavior of nigh Temperature Superconductors (HTS) is often modeled by an E-J power law in order to describe their electromagnetic properties. This paper presents Ae loss calculations in HTS tapes, performed by means of FEM commercial software using the A-V method. The implemented nonlinear model of the HTS tapes takes into account the B-dependence of the critical current density J(c) and the power index n. The expressions for J(c)(B) and n(B) are obtained from electrical measurements of a Bi-2223 tape under applied DC magnetic field, Numerical simulations of HTS tapes under different experimental conditions have been performed, i.e. the application of a transport current and/or AC external perpendicular magnetic field at 59 Hz. A comparative analysis of AC loss is then presented where J(c) and n are maintained either constant or B-dependent, The combined J(c)(B) and n(B) formulation leads to a better understanding of HTS electromagnetic behavior, especially when a perpendicular magnetic field is applied.