Fabrication of km-length IBAD-MgO substrates at a production rate ofkm h−1

Abstract

We have studied the ion-beam-assisted deposition (IBAD)-MgO process using alarge IBAD system with a large ion source. Using the large IBAD system, wesuccessfully fabricated a long-length IBAD-MgO tape (1 km) at a production rate of1 km h−1. We have also studieda process to deposit CeO2 films directly on IBAD-MgO tapes. It is revealed that theCeO2 film is fully texturedat about 100 nm. GdBa2Cu3O7−x (GdBCO) film was fabricated on a 180 m-longCeO2 /IBAD-MgO film.Its critical current (Ic) and current density (Jc) were over 300 A and 3 MA cm−2 at 77 K, self-field.