Abstract
Pulsed field magnetization (PFM) is an effective and practical magnetization method for bulk superconductor. When pulsed magnetic field is applied, however, large shielding current is induced in the direction to prevent magnetic fluxes from penetrating into the bulk superconductor. Trapped magnetic flux characteristics are sensitive to this magnetic shielding effect. In addition, inhomogeneity of superconducting properties influences a lot on the PFM characteristics, because the flux motion induced heat generation, the temperature rise, and the reduction of critical current density are strongly interrelated to one another. Such a complicated problem can be analyzed by three-dimensional finite element method. We have studied magnetic flux motion in bulk superconductor with inhomoneneous critical current distribution during PFM. The results indicate that magnetic flux penetration through the lower critical current density region and the sensitivity of this phenomenon to the assumed analysis model.
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