Abstract
We measured the magnetic field distribution of a high Tc bulk superconducting magnet (c-axis oriented EuBa2Cu3Oy crystals) during the magnetization process using magnetic resonance imaging. Measurements were performed in the field cooling process from 100 to 50K in a 4.74T magnetic field and in the field reducing process from 4.74 to 0T at 50K. In field cooling; we observed a significant decrease in the gradient coil efficiencies caused by the Meissner effect. Analysis of the trapped field suggested the presence of temperature gradients; microcracks; and inhomogeneity in the bulk crystals.
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