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Effects of Local Artificial Defects in Multifilamentary Coated Conductors With Patterned Links (Postprint)
AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH PROPULSION DIR/POWER DIV/MECHANICAL ENERGY CONVERSION BRANCH
Pagination or Media Count:
Multifilamentary coated conductor MFCC samples with patterned links have been studied using transport and scanning laser microscopy SLM techniques. Striation patterns are fashioned to define multiple filaments with discretely placed superconducting SC links between the filaments for current sharing and redistribution. After initial measurements, an artificial incision is made on a filament to mimic a disabled filament. The changes in global and local current transport characteristics are noted for in terms of the redistribution of current flow and the modification of local dissipation. Our results show that the patterned links between filaments play a vital role in redistributing current and encouraging current sharing. We find that the main factors in limiting the currentcarrying capability of MFCC samples are local current density increases, which we call current crowding. The susceptible areas for current crowding are several 1. filaments adjacent to the disabled ones, since the intact filaments have to carry extra current, 2. the links where current redistribution occurs, and 3. the partially blocked filament.
APPROVED FOR PUBLIC RELEASE