Numerical investigations on permanent magnet method using meshless approach

The permanent magnet method for measuring critical current density in high-temperature superconducting (HTS) thin film is numerically investigated. Formulation of the electromagnetic behavior of shielding current density in an HTS gives a system of time-dependent integro-differential equations. After discretizing the weak form of the problem based on element-free Galerkin method, the axisymmetric simulation code for analyzing the time evolution of the shielding current density in HTS is developed. From the time evolution of the shielding current density in HTS, the permanent magnet method is reproduced by means of the code. Results of the computation show that the critical current density is approximately proportional to the maximum repulsive force and this result agrees qualitatively with the experimental result