Saturday, 3F-08, 9:40-9:50

Development of the Low ac Loss Multifilamentary 2G Wire at SuperPower

M. Marchevsky

E. Zhang, Y. Y. Xie and V. Selvamanickam

SuperPower, Inc., 450 Duane Ave., Schenectady, NY 12304
Tel (518) 346-1414, Fax (518) 346-6080, e-mail: marchev@superpower-inc.com

Reducing ac losses in coated conductors is critically important for cable and rotating machinery applications. In 2G HTS wire ac losses are mainly associated with the hysteretic magnetization of the superconducting layer. One recently proposed technique of reducing such losses is striation of the YBCO layer into narrow filaments. At SuperPower we developed a robust and efficient method of manufacturing the striated 2G HTS wire based upon photolithography and subsequent one-step dry etching process. The conductor consists of five parallel 0.6 mm wide superconducting filaments separated by 0.2 mm wide gaps etched down to the substrate layer. Continuously striated wire pieces up to 14.5 m in length have been fabricated; they show typical reduction of magnetization ac loss at low (0-200 Hz) frequencies up to 5.1 times compared to a non-striated wire of same critical current. Various aspects of wire design and fabrication, including inter-filament coupling and critical current retention will be discussed. Most recent ac loss test results for the pancake coils wound with the striated wire will be shown.

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