FABRICATION OF WIND-REACT AND REACT-WIND HIGH-TEMPERATURE SUPERCONDUCTING BI-2223 AG COILS AND MAGNETS/

High-temperature superconducting (HTS) (Bi,Pb)(2)Sr2Ca2Cu3O10/Ag coils and magnets have been successfully fabricated using both the wind-rea ct (W-R) and react-wind (R-W) approach. Critical current obtained for a 139 turn, made from a 14 m tape solenoidal coil with a ceramic forme r fabricated using the W-R procedure was 7 A, which generated a self-f ield of similar to 19 mT at 77 K. A test magnet system of overall I-c of 6.2 A (and corresponding field at 77 K of similar to 30 mT) has bee n constructed from double-pancake coils, also fabricated by the W-R pr ocedure. Superconducting 'straps' were used to connect the double-panc akes. Based on its strength and thermal properties, alumina-based slur ry has been found to be the best among those materials tested and has been used as an insulator for W-R HTS coils and magnets. (C) 1998 Else vier Science B.V. All rights reserved.