Fabrication, qualification and test of high Jc ROEBEL YBa2Cu3O7-δ coated conductor cable for HEP magnets

The ROEBEL cable concept allows for a high critical current cable assembled using commercially available YBa2Cu3O7-δ coated conductors. this approach to cable design leads to several technological improvements if applied to the manufacture process of next generation low inductance, high current density HTS coils. A reduction in inductance proves to be extremely important when it comes to protection of coils capable of generating fields in the range of 40-50T, such as the ones needed in the last stage of the cooling channel of a muon collider. In this work several aspects are presented including the qualification and minimum requirements for YBa2Cu3O7-δcoated conductor in terms of 2D current density uniformity and the manufacturing process of ROEBEL cables. Test results achieved using a superconducting transformer for critical current measurements in liquid helium are shown, discussed and compared to the performance of a single YBa2Cu3O7-δ coated conductor tape.