120 100 80 60 40 20 0 MRS NEWS 812 MRS BULLETIN/OCTOBER 2002 MRS Superconductivity Workshop Explored Issues Related to Second-Generation YBCO-Coated Conductors The Materials Research Society’s Inter- national Workshop on Processing & Applications of Superconductors was held in Gatlinburg, Tennessee, July 31– August 2, 2002. Organized by M. Parans Paranthaman (chair), Amit Goyal, and Ron Feenstra of Oak Ridge National Labora- tory, USA; Teruo Izumi of ISTEC, Japan; and Venkat Selvamanickam of IGC- SuperPower, USA, the international work- shop presented research to 100 attendees from a group of 50 scientists from indus- try, national laboratories, and academia who are key players in the field of high- temperature superconductivity. Major advances have been made in the last 15 years in high-temperature super- conductor (HTS) research, resulting in increasing use of HTS materials in com- mercial and pre-commercial applications. HTSs are expected to be useful for numer- ous electric-power applications, including transmission cables, transformers, super- conducting magnetic-energy storage (SMES), current limiters, motors, and gen- erators. High efficiency, high power densi- ty, and improved materials utilization are some of the benefits expected from HTS materials. Much progress has already been made, from the near-term commercializa- tion of the first-generation bismuth stron- tium calcium copper oxide (BSCCO) superconductor tapes to the continuing advancement in second-generation con- ductors coated with yttrium barium cop- per oxide (YBCO). The goal of the workshop was to assess long- and short-term goals and needs, starting from an evaluation of the current status for each of the components of a typi- cal YBCO-coated conductor, that is, the metallic substrate, buffer layers, and the YBCO coatings. An international panel of experts addressed recent advancements and developments of long-length YBCO- coated conductors and applications of HTSs. Eight sessions were held to focus on various YBCO processing techniques, sub- strate development, buffer-layer technolo- gy, characterization, and applications of coated conductors. In each session, 5–6 speakers addressed a number of issues formulated by the organizers. At the end of each session, a panel discussion was held. In the poster session, 16 papers were presented. In the “Rump Session,” designed as an informal networking session, over- views were given on the status of second- generation YBCO-coated conductors in the United States, Japan, and Europe, followed by 10 presentations on late-breaking sized both the cost and ac loss advantages of YBCO-coated conductor composites over BSCCO multifilament composites. The development of second-generation coated conductors continues to show the steady improvement toward the long-length processing capabilities. Results were pre- sented from studies of several meter-length YBCO-coated conductors based on ion- beam-assisted deposition (IBAD) and rolling-assisted biaxially textured substrate (RABiTS) approaches; some examples are shown in Figure 1. Y. Iijima (Fujikura Ltd., Japan) reported critical currents of 40 A research and new directions. At the end of the workshop, a chair from each session contributed to the workshop summary. J.B. Roberto (Associate Laboratory Direc- tor for Physical Sciences, Oak Ridge, and former MRS president) and J.G. Daley (Superconductivity Program Manager, U.S. Department of Energy) gave the wel- come address. S. Tanaka (ISTEC, Japan) predicted the future of coated conductors in centimeter-wide 500-m lengths of tapes carrying critical currents of 300–350 A at 77 K and self-field. A. Malozemoff (Ameri- can Superconductor Corp., USA) empha- Organizers of the MRS International Workshop on Processing & Applications of Superconductors (left to right): Venkat Selvamanickam (IGC-SuperPower), Ron Feenstra (Oak Ridge National Laboratory), M. Parans Paranthaman, chair (Oak Ridge National Laboratory), Amit Goyal (Oak Ridge National Laboratory), and Teruo Izumi (ISTEC, Japan). Figure 1. High-performance yttrium barium copper oxide (YBCO) superconducting tapes fabricated by various companies. 223 A/cm over 10 m by PLD 0 5 10 15 Position (m) 40 A over 30 m by PLD 1 μV/cm 1 nV/cm I c (A) 20 25 30 60 50 40 30 20 10 0 4 8 12 30 Tape Position (cm) 90 A over 1 m by MOCVD J c (MA/cm 2 ) Critical Current (A) 40 140 120 100 80 60 40 20 0 Position on Tape (cm) 118 over 1.2 m by solution MOD process Critical Current (A/cm-width) 10 20 30 40 50 60 70 80 90 100 110 120 0 50 60 70 80 90100 1.1 1.0 0.8 0.6 0.4 0.2 0 CC tape: L = 10.3 m, w active = 3.5 mm www.mrs.org/publications/bulletin https://doi.org/10.1557/mrs2002.254 Downloaded from https://www.cambridge.org/core. IP address: 54.70.40.11, on 30 Dec 2018 at 04:55:20, subject to the Cambridge Core terms of use, available at https://www.cambridge.org/core/terms.