Abstract
A new type of bulk magnet can be fabricated by simply stacking short segments of coated conductors (CCs) of 123-type superconductors. To enhance the trapping field of the CC stack, we irradiated 800 MeV Xe ions to CCs. The fabricated CC stack consists of 80 pieces of irradiated CCs, and it was magnetized by field-cooling method in an applied field 9 T down to 5 K. When we tried to trap a large field by reducing the field at ramp rates faster than 0.5 mT/s, flux jumps occurred, which abruptly suppressed the trapped field. By reducing the magnetic field down to zero at a ramp rate slower than 0.5 mT/s, we have succeeded in trapping 9 T at the center of the CC stack. We also confirmed that the CC stack can sustain the high trapped field for more than 20 min, which demonstrates the practical usefulness of such a staked CC magnet.
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