The improved model based on the H-A formulation in large-scale HTS magnet

The rapid progression of the rare earth barium copper oxide (REBCO) coated conductor have paved the way for the development of high -field superconducting magnets. However, the elevated aspect ratio of REBCO tapes results in the generation of substantial screening currents, presenting a formidable challenge in the electromagnetic analysis of high -field superconducting magnets. Currently, the finite element method (FEM) stands as the dominant technique employed in large-scale superconducting magnet system for screening current computations in REBCO tapes, encompassing primarily the H formulation and the T -A formulation. However, these models exhibit certain limitations. In this paper, the two-dimensional axisymmetric H -A FEM model is introduced into the computation of REBCO tapes in high -field magnet, and the corresponding homogeneous model, partial homogeneous model and multi -scale model are established. It can be demonstrated that the model not only significantly accelerates computational speed but also enhances precision in comparison to the T -A model. Remarkably, the computational time of the H -A homogeneous model is approximately a quarter of that required by the T -A homogeneous model. It is anticipated that the model harbors substantial potential for future applications in the computational analysis of large-scale superconducting magnets.