High Critical Current Density in Internally-oxidized Nb3Sn Superconductors and its Origin

Xu, Xingchen; Peng, Xuan; Rochester, Jacob; Lee, Jae-Yel; Sumption, Mike

doi:10.1016/j.scriptamat.2020.05.043

High Critical Current Density in Internally-oxidized Nb₃Sn Superconductors and its Origin

Journal Article · Tue Jun 09 00:00:00 EDT 2020 · Scripta Materialia

DOI:https://doi.org/10.1016/j.scriptamat.2020.05.043· OSTI ID:1631133

Xu, Xingchen ^[1]; Peng, Xuan ^[2]; Rochester, Jacob ^[3]; Lee, Jae-Yel ^[4]; Sumption, Mike ^[3]

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

In this paper, we report achievement of non-Cu-matrix critical current density $$(J_c)$$ in internally-oxidized Nb₃Sn superconductors that surpasses the best state-of-the-art Nb₃Sn and the $$J_c$$ specification of the Future Circular Collider. We then explore the mechanism of the improvement, which was believed to be caused by refined grain size. However, our experiment showed that even with similar grain size, internally-oxidized wires had significantly higher $$J_c$$ than non-oxidized wires. This, combined with transmission electron microscopy and atom probe tomography studies which showed a high density of intragranular nano-precipitates with suitable sizes as pinning centers in internally-oxidized wires, demonstrates a significant contribution from the nano-precipitates.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: National Science Foundation (NSF); State of Florida; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

Grant/Contract Number:: AC02-07CH11359; SC0013849; SC0017755

OSTI ID:: 1631133

Alternate ID(s):: OSTI ID: 1632711

Report Number(s):: FERMILAB-PUB--20-218-TD; oai:inspirehep.net:1798020

Journal Information:: Scripta Materialia, Journal Name: Scripta Materialia Vol. 186; ISSN 1359-6462

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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