Flux pinning in NbTi superconductors with engineered pinning centers

Book · Sat Dec 31 04:00:00 EST 1994

OSTI ID:43031

Motowidlo, L R; Zeitlin, B A ^[1]; Ling, X S; Rizzo, N D; McCambridge, J D; Prober, D E ^[2]

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1. IGC Advanced Superconductors Inc., Waterbury, CT (United States)
2. Yale Univ., New Haven, CT (United States). Dept. of Applied Physics

In previously reported NbTi superconductors with artificially engineered pinning centers (APC), dramatic improvements in the critical current density (J{sub c}) over conventionally processed commercial NbTi superconductors have been demonstrated in magnetic fields below 4 Tesla. At higher fields however, the J{sub c} and H{sub c2} are reduced markedly. This is found to be a consequence of the pin material and basic design of the artificially engineered superconducting filament. In previous APC designs the volume percentage and choice of the pin material have been shown to be important for the proximity effect. Measurements also suggest 20% reduction in J{sub c} from the proximity of the copper surrounding the first assembly of subfilaments and pinning centers. Based on these findings, new APC designs have been implemented. The authors present preliminary results on the new APC designs for NbTi over extended magnetic field ranges.

• OSTI ID: 43031
• Report Number(s): CONF-9310224--; ISBN 0-87339-271-X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
COPPER
CRITICAL CURRENT
EXPERIMENTAL DATA
MAGNETIC FLUX
NIOBIUM ALLOYS
PROXIMITY EFFECT
SUPERCONDUCTING COMPOSITES
SUPERCONDUCTING WIRES
TITANIUM ALLOYS