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Development of high performance multifilamentary Nb-Ti-Ta superconductor for LHC insertion quadrupoles

A preliminary investigation of a new Nb-Ti-Ta (39 wt.%Nb, 44 wt.%Ti, 17 wt.%Ta) alloy has been investigated as a possible material for application at 1.9 K and 10.5 T in the insertion quadrupoles of LHC, 1550 A/mm/sup 2/, the highest yet reported critical current density at 10.5 T (1.9 K), was achie...

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Published in:IEEE transactions on applied superconductivity 1999-06, Vol.9 (2), p.1571-1574
Main Authors: Lee, P.J., Fischer, C.M., Larbalestier, D.C., Naus, M.T., Squitieri, A.A., Starch, W.L., Werner, J., Limon, P.J., Sabbi, C., Zlobin, A., Gregory, E.
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cited_by cdi_FETCH-LOGICAL-c407t-40be409717ab42bc31965a82d5c8ea5af6c5e2e6026c03b3c6eec1e041472a533
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container_end_page 1574
container_issue 2
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container_title IEEE transactions on applied superconductivity
container_volume 9
creator Lee, P.J.
Fischer, C.M.
Larbalestier, D.C.
Naus, M.T.
Squitieri, A.A.
Starch, W.L.
Werner, J.
Limon, P.J.
Sabbi, C.
Zlobin, A.
Gregory, E.
description A preliminary investigation of a new Nb-Ti-Ta (39 wt.%Nb, 44 wt.%Ti, 17 wt.%Ta) alloy has been investigated as a possible material for application at 1.9 K and 10.5 T in the insertion quadrupoles of LHC, 1550 A/mm/sup 2/, the highest yet reported critical current density at 10.5 T (1.9 K), was achieved in a monofilament of this material. The initial multifilamentary production strand produced a lower 10.5 T (1.9 K) critical current density of 1370 A/mm/sup 2/. Large variations in precipitate size were produced in the microstructures, which have yet to be fully optimized. Quantitative analysis of the microstructures in a Nb-44 wt.%Ti-15 wt.%Ta alloy reveals a linear relationship between volume % of /spl alpha/-Ti precipitate and critical current density at 5 T and 8 T (4.2 K). The increase in critical current with precipitate volume is less than for Nb-47 wt.%Ti. High resolution FESEM electron backscatter images suggest a high atomic number region adjacent to the grain boundaries after heat treatment.
doi_str_mv 10.1109/77.784695
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identifier ISSN: 1051-8223
ispartof IEEE transactions on applied superconductivity, 1999-06, Vol.9 (2), p.1571-1574
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1558-2515
language eng
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source IEEE Xplore (Online service)
subjects Applied sciences
Backscatter
Critical current
Critical current density
Electronics
Electrons
Exact sciences and technology
Grain boundaries
Heat treatment
Image resolution
Large Hadron Collider
Microstructure
Production
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Superconducting devices
title Development of high performance multifilamentary Nb-Ti-Ta superconductor for LHC insertion quadrupoles
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