Abstract
We have developed a CuNb-reinforced Nb3Sn (CuNb/Nb3Sn) wire. Critical current $(I_{c})$ of prebent CuNb/Nb3Sn coils with various diameters was investigated in order to develop a Nb3Sn superconducting magnet by a react-and-wind (R&W) method. It was found that the prebending treatment enhances $I_{c}$ of the small pure bending coil. In the small pure bending strain region, $I_{c}$ 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 $I_{c}$ 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 $I_{c}$ by pure bending strains. Hence, we can understand the relationship between coil diameter and prebending treatment for the R&W method using CuNb/Nb3Sn wires.
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