Successful operation of the Nb/sub 3/Sn Swiss insert coil for the 12 tesla Sultan test facility

The design and fabrication principles of the first high-field insert for SULTAN are described and the results of the coil test performed in the background field of the SULTAN facility are presented. The Swiss Nb/sub 3/Sn insert coil is the first of three A15 coils of SULTAN planned to demonstrate the feasibility of high-current, high-field superconductor technology for fusion devices in Europe. The forced-flow, steel-reinforced conductor is based on an external diffusion Nb/sub 3/Sn cable, and is reacted before conventional fabrication of the 60-cm bore coil. During tests in the background field of SULTAN, the coil reached the design current of 6 kA without training. It could only be turned normal by raising the temperature to 7.8 K at a current of 6.5 kA. In the present single-insert configuration of SULTAN a peak conductor field of 10.5 T was reached.<
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