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Superconductor Technologies Announces 2G High Temperature Superconductor Wire Critical Current Performance Achievement

SANTA BARBARA, Calif., Feb. 9, 2011 (GLOBE NEWSWIRE) -- Superconductor Technologies, Inc. (Nasdaq:SCON) ("STI"), a world leader in the development and production of high temperature superconducting (HTS) materials and associated technologies, today announced cutting edge high-magnetic-field test results for its second generation (2G) HTS wire. In an ongoing collaborative research and development agreement (CRADA) with Los Alamos National Laboratory (LANL), STI and LANL produced a 2G HTS wire sample that demonstrates exceptional in-field critical current values. This world-class current-carrying capability in high magnetic field demonstrates the effectiveness of STI's HTS fabrication process at producing 2G HTS wire for demanding applications such as superconducting fault current limiters and high-power wind turbine generators.

STI produced a 2G HTS coated conductor sample on a LANL template that exhibits a minimum critical current of 228 amperes (A) at a temperature of 65 kelvin (K) in an applied magnetic field of 3 tesla (T), corresponding to 256 A per centimeter (cm)-width. This critical current is the minimum value as a function of magnetic field angle. The maximum critical current of this sample at 65 K exceeded 404 A per cm-width for a 3-T magnetic field oriented parallel to the coated conductor surface; this latter current value was limited by the amount of current supplied by the measurement apparatus. In a 5-T field at 65 K, the coated conductor exhibited a minimum critical current of 143 A per cm-width and a maximum critical current of 322 A per cm-width. The measurements were performed at LANL's Superconductivity Technology Center in Los Alamos, NM.

Dr. Brian Moeckly, Director of Materials Research and Development at STI, commented: "Achievement of this level of current-carrying capability in high magnetic field is a critical milestone in our development of 2G HTS wire. In addition, we fabricated this sample using a straightforward HTS structure; we did not need to add additional elements or so-called artificial pinning centers to the coated conductor to obtain this result. While these measurements were performed on a small sample, we believe that the outstanding properties of this wire can be maintained upon scale-up of our processes to long-length 2G HTS wire production."

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