Development of Bi(Pb)-2223/Ag pancake-shaped and solenoidal coils

High temperature superconducting (HTSC) multifilamentary (MT) Bi(Pb)-2223/Ag tapes with reproducible critical current density of between 15000 and 20000 A/cm/sup 2/ at 77 K in self field have been achieved using the standard flat-rolling method as the intermediate deformation between sintering periods. Long lengths of Bi(Pb)-2223/Ag MT tapes up to 43 m prepared by the conventional method of powder-in-tube (PIT) have been successfully produced on a laboratory scale. Several coils have been fabricated from sections of the long length tape, using the co-wound wind-and-react (W&R) procedure for the pancake-shaped and the singly-wound W&R as well as R&W procedure for the solenoidal coils. A novel W&R solenoidal coil (reaching /spl sim/973 ampere-turns) wound on an alumina ceramic tube generates a DC field of /spl sim/19 mT at 77 K and has been fabricated together with five pancake-shaped coils, each generating an average of /spl sim/5 mT at 77 K. These are destined for magnet construction with a possible combined calculated field of /spl sim/0.04 T at 77 K (with liquid nitrogen as a coolant).