Speaker
Description
It is very desirable to reduce the long training for Nb3Sn magnets. Increasing the specific heat (Cp) of Nb3Sn conductors can significantly increase their energy margin, and thus may be a promising approach to reduce the magnet training. We developed a design to add high-Cp materials into Nb3Sn strands in 2017, which is compatible with standard Nb3Sn wire production process, and this design does not affect Nb3Sn conductor Je. Here we report our recent progress in the development of such high-Cp Nb3Sn strands toward magnet-grade conductors. By optimizing strand design (e.g., positioning of the high-Cp filaments in the strands, recipe of the high-Cp filaments, and selection of the high-Cp materials), presently strands with excellent drawability and significant Cp increase can be routinely produced. Long-length high-Cp wires are being fabricated. Finally the plan to build model coils using such conductors to investigate the effect on magnet training will be discussed.
