A High-Tc Superconducting Rutherford Cable Using Bi-2212 Oxide Superconducting Round Wire

We developed a new robust Rutherford cable using Bi-2212 high temperature superconducting (HTS) wire, which consisted of 427 superconducting filaments and which had a critical current density (Jc) value of 2.400D7;1 05A/cm2 at 4.2K in self-field. For applications requiring a Rutherford cable with a core such as NiCr, we found that a plasma sprayed ZrO2 film was most effective in preventing “poisoning” elements present in the core from diffusing into and poisoning the HTS wire. Rutherford cable made with this wire and a thin NiCr, core protected by ZrO2 film barrier layer was able to carry an Ic value of 3,570A. The Ic degradation in Bi-2212 AgMgSb sheathed wire was only 10%. Finally, we demonstrated the successful fabrication of an 80m-long Rutherford cable.