Cryostatic stability of miniaturized composite conductors

We have investigated the enhancement of the stability limits for miniaturized fine filament composites (NbTi-Cu) with type II diameters in the 1 μm range and below. The overall current densities have been evaluated. They are affected by permeabilities of coolant flow through narrow passages of cable-in-conduit type configurations which tend to be laminarized by miniaturization.