Experimental analysis shows magnetic force dependence on grain structure in high temperature superconductors, indicating material imperfections affect performance.
Magnetic levitation properties of MPMC-YBaCuO in three-dimensional geometries of practical interests were investigated experimentally. Especially, it was confirmed that the vertical and horizontal magnetic forces are strongly dependent on grain structure, cracks and applied magnetic field configuration. Furthermore, a three-dimensional computer code based on the current vector potential ( T ) method was upgraded. The dependence of critical current density ( T c ) on applied magnetic field can be taken into account. Magnetic force behavior in several configurations was numerically analyzed by using this code and the results were compared with the experimental ones. It is concluded that the discrepancy between the experimental and numerical results is mainly due to material imperfections such as grain boundary, cracks and deterioration of J c of large MPMG-YBaCuO samples.
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Uesaka et al. (1993) studied this question.
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