DEVELOPMENT OF SUPERCONDUCTING MAGNETS USING BI-2212/AG TAPES

Several pan-cake type coils were fabricated using Bi-2212/Ag tapes prepared by the combination of continuous dip-coating process and melt-solidification and tested in various temperatures and bias fields. A small Bi-2212/Ag double stacked pan-cake coil(13mm phi(inner bore)/46.5mm phi(outer diameter)) was used as an insert magnet of a conventional superconducting magnet system. In the bias field of 20.9T, the generated field of the Bi-2212/Ag coil was 0.9, at the I-c value of 310A(criterion 10(-13)Ohm m), in the saturated superfluid helium temperature(similar to 1.8K). Thus, this superconducting magnet system achieved generation of magnetic field of 21.8T in the full superconducting state. Larger Bi-2212/Ag double stacked pan-cake type magnet (20mm phi(inner bore)x9 4 m m phi(outer)) was also fabricated, The generated fields of the magnet at 4.2K in 0 and 20T bias fields were 2.6T (I-c=385A(10(-13)Ohm m)) and 1.08T (I-c=160 A(2x10(-13)Ohm m)), respectively. At about 20K, in helium gas, the generated field of the magnet was 1.53T (I-c=225A(10(-13)Ohm m)).