Enhanced critical currents in Bi-2223/Ag sheathed tapes by high energy proton irradiation

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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 ... continued below

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8 p.

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Coulter, J. Y. (James Y.); Maley, M. P. (Martin P.); Ullmann, J. L. (John L.); Fleshler, S. (Steve); Riley, G. N. (Gilbert N.), Jr. & Willis, J. O. (Jeffrey O.) January 1, 2001.

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Description

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.

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8 p.

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  • Submitted to: CEC/ICMC 2001, Madison, WI, July 16-20, 2001, International Cryogenics Materials Conference, a conference proceedings, AIP, April 2002

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  • Report No.: LA-UR-01-4478
  • Grant Number: none
  • Office of Scientific & Technical Information Report Number: 975684
  • Archival Resource Key: ark:/67531/metadc928044

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • January 1, 2001

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 5:53 p.m.

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Coulter, J. Y. (James Y.); Maley, M. P. (Martin P.); Ullmann, J. L. (John L.); Fleshler, S. (Steve); Riley, G. N. (Gilbert N.), Jr. & Willis, J. O. (Jeffrey O.). Enhanced critical currents in Bi-2223/Ag sheathed tapes by high energy proton irradiation, article, January 1, 2001; United States. (digital.library.unt.edu/ark:/67531/metadc928044/: accessed December 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.