Critical currents in long-length YBCO-coated conductors

Recent progress in developing large-area HTS-coated stainless-steel (SS) ta pes is reported. YBCO films have been grown on IBAD-YSZ buffered 0.1 m-m-th ick SS foils using a high-rate pulsed laser deposition technique which allo ws an increase of the deposition rate to 40 nm m(2) h(-1). YBCO-coated SS t apes containing a shunt layer, with a length up to 5.5 m, have been manufac tured and tested. A model treatment was performed to describe an interchang e of current between the shunt layer and the YBCO film. The optimal paramet ers of the shunt layer have been employed to reduce the resistive loss in t he coated tapes. The critical dc current of more than 105 A was observed in a 2 m-long and 10 mm-wide coated tape.