MRS Superconductivity Workshop Explored Issues Related to Second-Generation YBCO-Coated Conductors
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MRS NEWS
MRS Superconductivity Workshop Explored Issues Related to Second-Generation YBCO-Coated Conductors
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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 Director for Physical Sciences, Oak Ridge, and former MRS president) and J.G. Daley (Superconductivity Program Manager, U.S. Department of Energy) gave the welcome 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 (American Superconductor Corp., USA) empha-
50
1.1
1 µV/cm 1 nV/cm
0.8
30
0.6
20
0.4
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0.2 0
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10 15 20 Position (m)
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CC tape: L = 10.3 m, wactive = 3.5 mm
100 80 60 40 20 0
0 30
223 A/cm over 10 m by PLD
90 A over 1 m by MOCVD
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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 presented from studies of several meter-length YBCO-coated conductors based on ionbeam-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
Jc (MA/cm2) Critical Current (A)
40 A over 30 m by PLD
Critical Current (A/cm-width)
60
Ic (A)
The Materials Research Society’s International 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 Laboratory, USA; Teruo Izumi of ISTEC, Japan; and Venkat Selvamanickam of IGCSuperPower, USA, the international workshop presented research to 100 attendees from a group of 50 scientists from industry, national laboratories, and academia who are key players in the field of hightemperature superconductivity. Major advances have been made in the last 15 years in high-temperature superconductor (HTS) research, resulting in increasing use of HTS materials in commercial and pre-commercial applications. HTSs are expected to be useful for numerous electric-power applications, including transmission cables, transformers, superconducting magnetic-energy storage (SMES), current limiters, motors, and generators. High efficiency, high power density, and improved materials utilization are some of the benefits expected from HTS materials. Much progress has already been made, from the near-term commercialization of the first-generation bismuth strontium calcium copper oxide (BSCCO) superconductor tapes to the continuing advancement in second-generation conductors coated with yttrium barium copper 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 o
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