We have developed a CuNb-reinforced Nb3Sn (CuNb/Nb3Sn) wire. Critical current (Ic) of prebent CuNb/Nb3Sn coils with various diameters was investigated in order to develop a Nb3Sn superconducting magnet by a react-and-wind (RW) method. It was found that the prebending treatment enhances Ic of the small pure bending coil. In the small pure bending strain region, Ic of the prebent coil with over 96-mm outer diameter is larger than that of the as-reacted coil. However, the as-reacted coils exhibited large Ic in the large pure bending strain region. Calculated results on the basis of the perfect current transfer model with a neutral axis shift successfully indicated the enhancement behavior of Ic by pure bending strains. Hence, we can understand the relationship between coil diameter and prebending treatment for the RW method using CuNb/Nb3Sn wires.
- critical current
- pure bending strain
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering