Abstract
Ceramic-silver composite conductors have been fabricated in lengths greater than 200 meters using both powder-in-tube and dip-coated methods. Progress has been made in conductor uniformity through control of process steps including powder packing, tape coating, deformation, and heat treatment. Critical current density (J/sub c/) in lengths up to 100 meters has been evaluated by measuring end to end current in coils, both pancake wound and solenoid wound. These coils were made using a wind-and-react technique. J/sub c/ values greater than 10/sup 5/ A/cm/sup 2/ have been attained over 17 m lengths of conductor in these coils in self field at 4.2 K. The magnetic field dependence of 4.2 K J/sub c/ in fields its high as 17 T will be reported for these coils. Microstructural factors affecting J/sub c/ are discussed.
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