Use of the J-A Approach to Model Homogenized 2G Tape Stacks and HTS Bulks

This work explores an easy way to implement a current density focused formulation in commercial software, the J-A approach. The current density and magnetic vector potential are computed directly from the A-formulation, with only differential equations. The J-A has already been applied to simulate only one coated conductor, and the results were similar to the ones presented by the T-A formulation. The present work expands this idea to model bulks and stacks of coated conductors in 2D simulations. The J-A approach is used to compute the current density distribution and the levitation force of bulks and stacks of tapes acting as superconducting magnetic bearings to check the model's applicability. This model includes the complete representation of the magnetic guideway and a moving mesh representing movement between the superconducting region and the magnetic guideway. This approach provides a simple and fast way to investigate the major characteristics of superconducting devices that may be applied in their optimization. The simulated results have agreed with experimental data, which validates the J-A approach for the studied cases.