Development of a pre-bent react-and-wind CuNb/Nb3Sn multilayer superconducting coil

摘要

A superconducting multilayer coil using CuNb/ Nb3Sn wire was fabricated by the pre- bent react- and- wind ( R& W) method. The pre- bent R& W method is a combination of the pre- bending treatment and the conventional R& W process. A 0.8% pre- bending strain was applied by ten fixed pulleys. The coil was tested in magnetic fields of 14, 12, 11 and 10 T at 4.2 K. The coil quench current achieved 100% load ratio of the short sample critical current in the 14 T back- up field. The quench current of the outer section coil achieved 100% of the short sample critical current in the 12 T back- up field. The coil quench currents in various magnetic fields are discussed from a hoop stress and mechanical disturbance point of view.