Efforts to optimize large scale in situ production of Nb3Sn-Cu superconductor wire are described. The as drawn Nb filament size is critical in optimizing J sub c values and depends upon the temperature of the Sn diffusion anneal. Laboratory size experiments show that utilizing carbon containers for ingot preparation results in a small C contamination and significantly lower J sub c values. Reduction of C contamination of 30 kg ingots are casted by utilizing ceramic coatings on the graphite lined Cu casting molds is described.
Presented at the Cryogenic Eng. Conf
- Pub Date:
- Niobium Stannides;
- Molding Materials;
- Electronics and Electrical Engineering