HTS conductors for magnets

Superconducting Materials and Conductors: Fabrication and Limiting Parameters

“…The main attractiveness of Bi-2212, besides the highfield properties recalled above, is that it is available as a round wire, and can thus be formed into a Rutherford cable, as has been consistently demonstrated since the 1990s [113][114][115][116]. The record J E is around 500 A/mm 2 at 20 T, 4.2 K in a 1-m-long round wire [117] (Fig.…”

“…The concept of Rutherford cables can be easily applied to any material that comes in the form of round wires, and it has been extended to round Bi-2212 HTS wires [113][114][115][116]. Further cable concepts, such as the Roebel bar, or tape assemblies around a stabilizer core or tube, discussed earlier, are in an early stage of development and have not yet found an accelerator application.…”

Effect of proton irradiation on the critical current and critical temperature of Bi-2212 wires

“…The wires for this study came from a single billet which was manufactured and reacted by SHOWA Electric Wire and Cable and is of the 127 x 7 design, with 27 % Bi-2212 powder fill factor [2]. Five samples were used for irradiation and three other samples were measured in the un-irradiated state to check the uniformity of the wires.…”

Future Accelerator Magnet Needs

“…Rutherford cables have been successfully produced from 0.8 mm strands [17]. Due to the complex reaction process, react-and-wind is assumed to be the only coil winding alternative with the possible exception of small coils where wind-and-react might be used.…”