Ternary Nb3Sn superconductors with artificial pinning centers and high upper critical fields

Xu, Xingchen; Rochester, Jacob; Peng, Xuan; Sumption, Mike; Tomsic, Mike

doi:10.1088/1361-6668/aaf7ca

Ternary Nb₃Sn superconductors with artificial pinning centers and high upper critical fields

Journal Article · Thu Jan 03 00:00:00 EST 2019 · Superconductor Science and Technology

DOI:https://doi.org/10.1088/1361-6668/aaf7ca· OSTI ID:1487043

^[1]; Rochester, Jacob ^[2]; Peng, Xuan ^[3]; Sumption, Mike ^[2]; Tomsic, Mike ^[3]

Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
The Ohio State Univ., Columbus, OH (United States)
Hyper Tech Research Inc., Columbus, OH (United States)

In this letter we demonstrate the development of ternary Nb3Sn multifilamentary conductors with artificial pinning centers (APC) which achieve high critical fields. These recently-developed conductors were tested in a 31 T magnet, and the results showed that their upper critical field (B _c2) values at 4.2 K are 27-28 T, and irreversible field (B _irr) values are above 26 T, values similar to or higher than those of best RRP conductors. The non-Cu J _c has been brought to nearly 1200 A/mm^–2 at 16 T and 4.2 K, comparable to RRP, in spite of the fact that the fine-grain Nb₃Sn fractions in filaments are still low (20-30%) and the grain sizes are still not fully refined (70-80 nm) due to conductor designs and heat treatments that are not yet optimized. The Nb₃Sn layer J _c at 4.2 K, 16 T is 4710 A/mm^–2 for the APC wire with 1% Zr, about 2.5 times higher than RRP conductors, in spite of the fact that its grain size is not yet fully refined due to insufficient oxygen and unoptimized heat treatment. An analysis is presented about the non-Cu J _c that can be achieved by further optimizing the APC conductors and their heat treatments.

View Accepted Manuscript (DOE)

Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1487043

Alternate ID(s):: OSTI ID: 22907778

Report Number(s):: FERMILAB-PUB--18-572-TD; arXiv:1810.10569; 1700498

Journal Information:: Superconductor Science and Technology, Journal Name: Superconductor Science and Technology Journal Issue: 2 Vol. 32; ISSN 0953-2048

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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