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 (J(c)) value of 2.4x10(5)A/cm(2) 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 I-c value of 3,570A. The I-c degradation in Bi-2212 AgMgSb sheathed wire was only 10%. Finally, we demonstrated the successful fabrication of an 80m-long Rutherford cable.