Critical current of superconducting Rutherford cable in high magnetic fields with transverse pressure

For high energy physics applications superconducting cables are subjected t o large stresses and high magnetic fields during service. It is essential t o know how these cables perform under these operating conditions, A loading fixture capable of applying loads of up to 700kN has been developed by NHM FL for LBNL, This fixture permits uniform loading of straight cables over a 122 mm length in a split-pair solenoid in fields up to 12 T at 4.2 K, The first results from this system for Rutherford cables of internal-tin and mo dified jelly roll strand of Nb3Sn produced by IGC and TWC showed that littl e permanent degradation occurs up to 210 MPa. However, the cable made from internal-tin strand showed a 40 % reduction in I-c at 11T and 210 MPa while a cable made from modified jelly roll material showed only a 15 % reductio n in I-c at 11T and 185 MPa.