The effect of static and cyclic axial strain on I/sub c/ of cable in conduit net subcables

Abstract

The effect of static and cyclic axial strain, in /sub a/, on the critical current, I/sub c/, of Nb/sub 3/Sn cable in conduit (CIC) subconductors has been measured at I/sub c/ <or= 10 kA and magnetic fields of B <or= 12.5 T. The conductors exhibit a maximum of I/sub c/ at in /sub a/ approximately=0.7% and a degradation of I/sub c/ of about 50% at in /sub a/=0 and B=12.5 T. As a major result, the I/sub c/ vs in /sub a/ characteristic is unaffected up to 10/sup 3/ strain cycles at in /sub a/<or=1%. The cables were constructed using the wind and react technique. Two different types of cable were developed, based either on a braid or on a triplet cable, inserted in a stainless steel jacket with 44% void fraction. For both cables a modified jelly roll (MJR) processed basic Nb/sub 3/Sn wire was used.