SUPERCONDUCTING MAGNET SYSTEM CONTAINING BI-2212/AG COIL GENERATES 21.8 T AT 1.8K

We fabricated a Bi-2212/Ag double stacked pancake coil of 13 mm phi in inner bore and of 46.5 mm phi in outer diameter, by using Bi-2212/Ag tapes prepared by the combination of continuous dip-coating process and melt-solidification technique. This small superconducting magnet was used as an insert magnet of a conventional superconducting magnet system and tested at saturated super-fluid helium temperature (similar to 1.8K) in various bias fields. The generated field of Bi-2212/Ag coil was 0.9 T, with I-c of 310 A(criterion 10(-13)Omega . m), in the bias field of 20.9 T. Thus, this superconducting magnet system achieved generation of magnetic field of 21.8 T in the full superconducting state.