Generation of 21.5 T by a superconducting magnet system using a Bi2Sr2CaCu2Ox/Ag coil as an insert magnet

We fabricated a Bi2Sr2CaCu2Ox/Ag pancake coil by applying a dip-coating process, which was used as an insert coil of conventional superconducting magnet system. The critical current of the insert coil at saturated superfluid helium temperature (1.8 K) in the bias field of 20.8 T, was 275 A, and the field generated at this current was 0.7 T. As a result, we could achieve the field generation of 21.5 T at the center of the magnet system which was the highest field obtained by the full superconducting state.