Progress in Scale-Up of RE-123 Coated Conductors With $I_{c}$ of 300 A/cm by IBAD/PLD Process

By an IBAD/PLD method, a 500 m-length high-performance GdBa₂Cu₃O_x (GdBCO) coated conductor with BaZrO₃ (BZO) was fabricated. End-to-end I_c of the 503.5 m tape was 349.6 A/cm at 77 K, corresponding I_c times L value of 176,023 Am. New approaches to decrease the thickness of IBAD buffer layers were developed by combination of IBAD-MgO(111) and IBAD-Gd₂Zr₂O₇ (GZO). The maximum Jc of the GdBCO on the buffer layer was 550 A/cm. We also started to investigate IBAD-MgO(OOl) by using a large IBAD system with a 110 cm times 15 cm ion source. A 50 m-length IBAD-MgO tape with DeltaPhi of 13deg was fabricated at a 100 m/h-1 pass. Insulated REBCO wires with Cu or Ni-Cr lamination were developed using 5 mm-wide conductors sliced from 10 mm-wide IBAD/PLD tapes. Practical long insulated wires were supplied for several prototypes of motors, transformers and fault current limiters in fiscal 2007.