Development of long Y-123 coated conductors for coil-applications by IBAD/PLD method

Long length Y-123 superconducting tapes were produced by reel-to-reel continuous vacuum processing, by using Ion-Beam-Assisted Deposition (IBAD) and Pulsed-Laser-Deposition (PLD). Biaxially textured Gd₂Zr₂O₇ buffer layers up to 255-m long were fabricated by IBAD with production speed of 0.5-1.0 m/h. Y-123 films were formed on them by PLD with production speed of 1.0-4.0 m/h. A 105-m long Y-123 film was fabricated with uniform thickness of 1.0 μm and Δφ of 3-4°. I_c of 126 A was obtained in end-to-end at 77 K, 0 T, whose I-V curve had n-value of 28.5. I_c times length reached 13,230 Am. Another 70-m long Y-123 tape with I_c over 90 A (77 K, 0 T) was wound into a Solenoid type magnet whose inner diameter was 60 mm. The central field of 0.27 T was obtained at 66 K, with operating current of 130 A.