A process "continuous wrapping tantalum barrier" has been developing and investigated in this paper. By eliminating the need for inserting expensive tantalum tube, barrier is applied to unlimited piece length prior restack. A tantalum barrier with 20% overlap was wrapped onto subelements. Then 18-filament Nb 3 Sn plus 1 copper core restack billet was successfully drawn down to wire with 0.84-mm diameter. The longitudinal and cross-sectional images revealed most of barriers were continuous and intact but some disrupted. So, we are still working on the optimization of manufacturing process. 2004 Plenum Publishing Corporation.
