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Enhanced critical currents in Bi-2223/Ag sheathed tapes by high energy proton irradiation [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 2001.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
8 pages : digital, PDF file
Additional Creators
Los Alamos National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
We irradiated Bi-2223/Ag sheathed tapes with high-energy protons, causing fission reactions with Bi and Pb nuclei and generating in situ splayed columnar defects in the superconductor core of the tapes. We find that the best 75 K critical-current density J{sub c} performance in an applied magnetic field B perpendicular to the tape plane is achieved at a matching field, for which the flux-quantum density equals the columnar-defect density, of about 1 T. At this defect density, the J{sub c} at 75 K and 1 T perpendicular to the tape plane is almost 100 times larger than that for an unirradiated tape. For higher proton doses, there is increasingly greater grain-boundary damage, lowering the self-field J{sub c} and ultimately degrading the in-field performance. However, much of this damage can be repaired with a short anneal at 400 C. Decreasing the incident proton energy from 800 to 500 MeV has little effect on the enhanced J{sub c} performance and has beneficial side effects. Irradiation of a stack of tapes demonstrates the high penetration power and uniform generation of columnar defects throughout a substantial volume of material. The application of this technique to improved device performance will be discussed.
Report Numbers
E 1.99:la-ur-01-4478
la-ur-01-4478
Subject(s)
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Note
Published through SciTech Connect.
01/01/2001.
"la-ur-01-4478"
Submitted to: CEC/ICMC 2001, Madison, WI, July 16-20, 2001, International Cryogenics Materials Conference, a conference proceedings, AIP, April 2002.
Willis, J. O.; Coulter, J. Y.; Riley, G. N. , Jr.; Ullmann, J. L.; Maley, M. P.; Fleshler, S.
View MARC record | catkey: 14711540