Processing issues for high critical current density in BSCCO-2212 composites

Issues for controlling the critical current density (J(c)) in long tapes an d wires include homogeneity of the starting powders, optimization of the ce ramic size and shape, uniformity of the deformation or coating processes, a nd control of the heat treatment parameters. This range of issues is discus sed for both multilayer dip-coated and multifilamentary powder-in-tube comp osites. In particular, J(c) is shown to depend strongly on ceramic size and shape. Continuing efforts to correlate J(c) with processing issues are pre sented. Progress toward applications in high field coils is described.