YBCO Coated Conductors with Reduced AC Losses

Abstract : At the onset of this Project AMSC used an R&D scale to demonstrate the AMSC 2G HTS process in 10 m long, 10 mm wide 2G conductors which showed 250 A end-to-end critical currents Ic at 77 K. Standard deviation of Ic in these wires was low and index values n (V tilde In) were quite high, ranging from 31 to 37. For a more cost-effective full scale 2G HTS production, a processing width of 100 mm is envisioned, with a processing length of >1000m. Only at the very end of the process, after coating of the Ag cap layer, is the conductor slit to final conductor width which is around 4 mm. To bridge this gap between the 10 and 100 mm process width, the 2G HTS development used an in-between process width of 40 mm. During the Phase II the process width remained at 4 cm, and length was around 130 m. At the end of the Phase II the length was extended to 500 m.