The filamentation of tape shaped RE123-coated conductors is important to reduce the shielding current from RE123 superconducting layer  in development of a high-field magnet such as NMR and MRI. In last year, we reported the development of split wire with 16-main-core by electrical separating by bending stress (ESBS) method . In this study, to obtain more main-core, an electrical separating by pressure concentration method (ESPC) without a large bending of tape was adopted. We also improved the equipment that can produce above 12 cores simultaneously. In experiments, a 30-main-core sample was prepared and the average widths of main-core and sub-core are ~70 and ~10 μm, respectively. The results in microstructure and performances, such as critical current, with manufacturing method by the ESPC method, will be discussed in upcoming MT26 at Vancouver.
 Xinzhe Jin, Hidetoshi Oguro, Yugo Oshima, Tetsuro Matsuda and Hideaki Maeda, "Development of a REBa2Cu3O7-δ multi-core superconductor with “inner split” technology," Superconductor Science and Technology 29 (2016) 045006 (8pp)
 Xinzhe Jin, Yasuteru Mawatari, Toshihiro Kuzuya, Yusuke Amakai, Yoshinori Tayu, Naoki Momono, Shinji Hirai, Yoshinori Yanagisawa, Hideaki Maeda, "Fabrication of 16-main-core RE123 split wire using inner split method," IEEE Transactions on Applied Superconductivity (in press)
This work was supported by the MEXT project of Leading Initiative for Excellent Young Researchers (LEADER) in Japan (Project ID: 16810210).