抄録
The advantages of using a MgB2 compound in fusion applications are not only higher Tc (39 K) and low cost but also lower induced radioactivity than Nb-based superconductors. However, the Jc value of MgB2 wire is lower than that of Nbbased superconducting wire, and further improvement in Jc is required for use in advanced fusion reactor applications. Furthermore, the selection of low-activation sheath material is also required to keep the low induced radioactivity property. We prepared a Cu-added MgB2/Ta/Cu mono-cored wire using a Mg2Cu compound as the source material via a low-temperature diffusion process, and the transport Jc-B performances in the 4.2 K to 20 K temperature region were measured in order to investigate the possibility of the high-temperature operation.
