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The paper presents new developments in modeling AC losses in high-temperature superconducting (HTS) tapes as a highly nonlinear diffusion process. Following successful 1D formulation for a bulk superconductor and subsequent inclusion of the presence of silver in a tape using a 'sandwich' model, a 2D scheme has now been developed using time-stepping finite difference formulation and is briefly described. Edge effects and importance of nonlinearity are emphasised.Index Terms-AC losses, field diffusion, computational magnetics, high temperature superconductivity, time dependent magnetic fields.

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