Long-length GdBCO coated conductors with IBAD/PLD method

We fabricated a long-length GdBCO(GdBa2Cu3O7-δ) coated conductor by the ion-beam assisted deposition (IBAD) and the pulsed laser deposition (PLD) methods. The GdBCO tape was over 400 m in length with 1.5-2.0 MA/cm2 of the critical density. The critical currents of the tape were over '304.8 A/cm' along 368 m in length. So we have achieved 'Ic x L = 112,116 Am'. For the IBAD process, we have already developed 500 m-length IBAD-Gd2Zr2O7 (IBAD-GZO) tapes with highly aligned in-plane texture, and continuously fabricate 250 m-length tapes at a rate of 0.5∼1 km/month. In addition, we have also developed a new type template for the IBAD-GZO, to enable the production rate fast. Structure of the template is IBAD-GZO/IBAD-MgO/Y2O3. It is note that MgO (111) is parallel to the substrate normal and three fold symmetry. For this structure, the film thickness of the IBAD-GZO could lessen from 1.2 μm to 0.3 μm. By the new IBAD buffer layer, a production rate is expected to be over 30 m/h