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RECENT PROGRESS IN SECOND-GENERATION HTS WIRE TECHNOLOGY AT SUPERPOWER

Abstract

We report recent progress in 2G-HTS wire technology at Superpower Inc. The throughputs of 4mm-wide tape have reached 750m/h for sputtering AlO3+Y2O3 base layer, 360m/h for IBAD MgO template, 345m/h for sputtering Homo-epi MgO+LMO buffer, 180m/h for MOCVD REBCO. Critical current (Ic) of 813A/cm-width at 77K and self-field has been achieved on 1 meter length of 12mm-wide tape in which the thickness of GdYBCO film is 3.3 microns. Ic in a magnetic field has been significantly improved through composition modification, doping and MOCVD condition optimization. Ic of 185.6A/cm-width at 77K and 1Tesla has been obtained. For Ic on long lengths, 314A/cm-width on 202m, 221A/cm-width on 610m and 170A/cm-width on 935m have been achieved. A coil of 19.1mm diameter we made with our 2G wires generated 26.8T magnetic field in the magnet. A 30m-long cable made with nearly 10,000 meters of Superpower 2G wires showed excellent overall performance and has been installed and energized in the power grid.

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1 Shiohara, Y, Yoshizumi, M, Izumi, T and Yamada, Y, Supercond. Sci. Technol. 21, 034002 (2008).
2 Chen, Yimin and Selvamanickam, Venkat, in Pinning, Flux and AC Loss Studies on YBCO Coated Conductors, (Nova Science Publishers, Nre York, 2007), p.205216.
3 Barnes, P. Int. J. Appl. Ceram. Technol., 4, 242249 (2007)
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5 Freyhardt, Herbert C. Int. J. Appl. Ceram. Technol, 4, 203216 (2007)
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RECENT PROGRESS IN SECOND-GENERATION HTS WIRE TECHNOLOGY AT SUPERPOWER

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