High-T-c coated conductors - Performance of meter-long YBCO/IBAD flexible tapes

One meter long tapes based on 50-100 mu m thick by 1 cm wide nickel alloy s ubstrates have been coated in a continuous process with a textured yttria-s tabilized zirconia layer by ion beam-assisted deposition, followed by a 1-2 mu m thick layer of YBCO by pulsed laser deposition. The best result to da te is a tape with a critical current (I-c) at 75 K of 96 A over an 87 cm me asurement length. The overall critical current density and engineering curr ent density are 1 MA/cm(2) and 10 kA/cm(2), respectively. Using a special p robe, individual I-V curves were generated for each centimeter of tape leng th in order to investigate longitudinal uniformity of the transport propert ies: the highest and lowest I-c values fall within a range of +/- 25%.