Effect of polymeric and metal substance impregnation on the magnetic properties of YBCO bulk superconductor

The cylindrical type of YBCO bulk superconductor was fabricated by top-seeded melt growth (TSMG) process. The 10 mm diameter of hole was mechanically drilled at the center of YBCO bulk, parallel to the c-axis. Then the mechanically drilled YBCO bulk was impregnated by epoxy resin or indium in order to elucidate the effect of impregnation on the trap field distribution depending filler materials. The trap fields of plain YBCO and YBCO with hole at 77K under 0.33 T were 2.77 kG and 2.705 kG, whereas the trap fields of YBCO filled with resin or indium were 2.695 kG and 2.682 kG, respectively, which is relatively lower than plain YBCO without any impregnation. Based on our preliminary results of magnetic field mapping, the trap field shows the tendency of decrease even after impregnation by resin and indium into YBCO hole.