The effect of static and cyclic axial strain on Ic of cable in conduit net subcables

The effect of static and cyclic axial strain, ∈_a, on the critical current, I_c, of Nb₃Sn cable in conduit (CIC) subconductors has been measured at I_c ⩽ 10 kA and magnetic fields of B ⩽ 12.5 T. The conductors exhibit a maximum of I_c at ∈_a≈0.7% and a degradation of I_c of about 50% at ∈_a=0 and B =12.5 T. As a major result, the I_c vs ∈ _a characteristic is unaffected up to 10³ strain cycles at ∈_a⩽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 Nb₃Sn wire was used