Effects of Compressive Force Between Strands on Contact Resistance in Cable-in-Conduit Conductors

We have measured the contact resistance between superconducting strands, which is a parameter of coupling losses in cable-in-conduit conductors. Varying the twist pitches of sub-cables in the multi-stranded cables, we prepared triplets made of three strands with four different intersection angles between the strands (0, 5, 7 and 13 degrees). The experimental results showed that the range of the surface resistances estimated by both the contact areas and the contact resistances depended on the intersection angles between the strands of the cable. When we estimate inter-strand coupling losses in the cable, we have to take the contact condition of the cable into consideration. The obtained results enlarge the database used to simulate an electric circuit model of multi-stranded conductors and to estimate inter-strand coupling losses in the conductors.