Performance of UNK superconducting dipoles with natural oxide coating of strands

This paper describes the properties of SC cable with natural oxide on the strands developed for the UNK SC magnets and summarizes the performance of short and long magnets made of such cable. The coating was selected based on the studies of cable samples with various strand coating. Ten 1-m long dipoles and two 6-m long dipoles were manufactured using the cable with natural oxide coating of strands. These dipoles had low value of AC losses in the coil and reached the maximum magnetic field of 6.5 T in magnet aperture at the current ramp rates up to 0.8 T/s and 4.25 K temperature. The effects of interlayer splices and cable electrical insulation on the magnet ramp rate dependence are also reported.