Abstract
Drilling holes in a bulk high-Tc superconductor enhances the oxygen annealing and the heat exchange with the coolingliquid. However, drilling holes also reduces the amount of magnetic flux that can betrapped in the sample. In this paper, we use the Bean model to study the magnetizationand the current line distribution in drilled samples, as a function of the hole positions.A single hole perturbs the critical current flow over an extended region that isbounded by a discontinuity line, where the direction of the current density changesabruptly. We demonstrate that the trapped magnetic flux is maximized if thecentre of each hole is positioned on one of the discontinuity lines produced by theneighbouring holes. For a cylindrical sample, we construct a polar triangularhole pattern that exploits this principle; in such a lattice, the trapped field is∼20% higher than in a squared lattice, for which the holes do not lie on discontinuity lines. Thisresult indicates that one can simultaneously enhance the oxygen annealing, the heattransfer and maximize the trapped field.
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