Lawrence Berkeley National Laboratory

A 6-around-1 transposed cable using superconducting star® wires can be useful for future circular collider applications. We made three cable samples using single star® wires with a diameter of 1.3 mm. The first two samples, made with a cabling machine, used star® wires consisting of a 0.7 mm diameter Nb-Ti core. The third cable sample was manually wound and used a star® wire made with a 0.81 mm diameter Cu core. The first sample showed severe degradation after the cable was bent to a 75 mm radius. The current-carrying capability of the innermost and outermost rebco tapes in the star® wire degraded by 42% to 98% and the middle rebco tapes remained intact. This was also the case for the second and straight cable sample. After fabrication of the third cable sample, we observed only about 5% reduction in the current along the wire, measured at different locations inside the terminations. The results indicate that the differences in architecture or fabrication of the star® wires could have caused differences in critical current retention after cabling.