Abstract
Reduced sized cable-in-conduit Nb 3Sn conductors were fabricated with various void fractions as a parameter, before fabricating full size conductors. The relation between critical current and bending strain was investigated. The Nb 3Sn conductors had a 6 × 3 strand cable in a conduit with 0.61 mm diameter strands. The void fractions were changed from 30% to 50%. The conductor with ∼50% void fraction had a critical bending strain ( ε bc) of ∼0.9%, which was nearly equal to that for the strand, while conductors with void fractions below ∼40% behaved like a monolithic conductor with ε bc below ∼0.5%.
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