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The powering of the LHC machine requires more than 1000 High Temperature Superconducting (HTS) current leads. These leads contain, at their cold end, HTS conductors made of stacks of Bi-2223 tape with gold-doped silver matrix. CERN specified and purchased 31 km of this material, which was delivered on spools in unit lengths of 100 to 300 m. On reception the tape was inspected, cut into short length...
Flat-conductors made by high temperature superconducting filaments can be electrically insulated by a host of different materials. After selecting the best performing system, an electrical characterisation stage has been implemented through dielectric breakdown tests in air and in liquid nitrogen (LN2) and through ageing in LN2, at atmospheric pressure
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