DEVELOPMENT OF SUPERCONDUCTING MAGNETS USING BI-2212 AG TAPES/

Several pan-cake type coils were fabricated using Bi-2212/Ag tapes pre pared by the combination of continuous dip-coating process and melt-so lidification and tested in various temperatures and bias fields. A sma ll 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 s uperconducting magnet system. In the bias field of 20.9T, the generate d field of the Bi-2212/Ag coil was 0.9, at the I-c value of 310A(crite rion 10(-13)Ohm m), in the saturated superfluid helium temperature(sim ilar to 1.8K). Thus, this superconducting magnet system achieved gener ation of magnetic field of 21.8T in the full superconducting state. La rger Bi-2212/Ag double stacked pan-cake type magnet (20mm phi(inner bo re)x9 4 m m phi(outer)) was also fabricated, The generated fields of t he 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=2 25A(10(-13)Ohm m)).