However, the perpendicular components of the self-field of the HTS tape in the air gap can be enhanced by the iron cores and cause a critical current reduction of up to 40% to the tape. Normally, they are made of copper field coils and iron cores with narrow air gaps for the HTS tape to pass through. Magnetic switches apply AC magnetic fields to DC current-carrying high temperature super-conducting (HTS) tapes to generate DC voltages and are commonly used in the persistent current switches (PCSs) and flux pumps to charge HTS coated conductors (CCs) magnets. The results indicate that the modified FFT-based method is also valid for the computation of the strip stack problems and efficient as the number of strips is not very large. Next, we simplify the 2D film problems to the infinitely long strip situation and use the modified method to calculate the strip stack problems. The results show that the FFT-based method is an efficient method for the calculations of the superconducting film carrying transport current. The numerical results are compared with the integral solution for accuracy and the T–A formulation in finite elements for efficiency. This modified method is implemented by transforming the boundary conditions of the transport current. To take into account the effect of the transport current, we modify the previous method and then use it to calculate the electromagnetic behaviors of the thin film. There are few works on the calculations of the superconducting film with transport current using the FFT-based method. The Fast Fourier Transform (FFT) method was used to simulate the magnetization problems of the thin film in a perpendicular magnetic field.
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