Evaluation of critical current density and residual resistance ratio limits in powder in tube Nb3Sn conductors

Segal, Christopher; Tarantini, Chiara; Sung, Zu Hawn; Lee, Peter J.; Sailer, Bernd; Thoener, Manfred; Schlenga, Klaus; Ballarino, Amalia; Bottura, Luca; Bordini, Bernardo; Scheuerlein, Christian; Larbalestier, David C.

doi:10.1088/0953-2048/29/8/085003

Title: Evaluation of critical current density and residual resistance ratio limits in powder in tube Nb₃Sn conductors

Journal Article · Fri Jun 10 00:00:00 EDT 2016 · Superconductor Science and Technology

DOI:https://doi.org/10.1088/0953-2048/29/8/085003· OSTI ID:1271124

Segal, Christopher ^[1]; Tarantini, Chiara ^[1]; Sung, Zu Hawn ^[1]; Lee, Peter J. ^[1]; Sailer, Bernd ^[2]; Thoener, Manfred ^[2]; Schlenga, Klaus ^[2]; Ballarino, Amalia ^[3]; Bottura, Luca ^[3]; Bordini, Bernardo ^[3]; Scheuerlein, Christian ^[3]; Larbalestier, David C. ^[1]

Florida State Univ., Tallahassee, FL (United States). Applied Superconductivity Center, NHMFL
Bruker EAS GmbH, Hanau (Germany)
European Organization for Nuclear Research (CERN), Geneva (Switzerland)

High critical current density (Jc) Nb₃Sn A15 multifilamentary wires require a large volume fraction of small grain, superconducting A15 phase, as well as Cu stabilizer with high Residual Resistance Ratio (RRR) to provide electromagnetic stabilization and protection. In Powder-in-Tube (PIT) wires the unreacted Nb7.5wt.%Ta outer layer of the tubular filaments acts as a diffusion barrier and protects the interfilamentary Cu stabilizer from Sn contamination. A high RRR requirement generally imposes a restricted A15 reaction heat treatment (HT) to prevent localized full reaction of the filament that could allow Sn to reach the Cu. In this paper we investigate recent high quality PIT wires that achieve a J_c(12 T, 4.2 K) up to ~2500 A/mm^-2 and find that the minimum diffusion barrier thickness decreases as the filament aspect ratio increases from ~1 in the inner rings of filaments to 1.3 in the outer filament rings. We found that just 2-3 diffusion barrier breaches can degrade RRR from 300 to 150 or less. Using progressive etching of the Cu we also found that the RRR degradation is localized near the external filaments where deformation is highest. Consequently minimizing filament distortion during strand fabrication is important for reducing RRR degradation. The additional challenge of developing the highest possible J_c must be addressed by forming the maximum fraction of high J_c small-grain (SG) A15 and minimizing low J_c large-grain (LG) A15 morphologies. Finally, in one wire we found that 15% of the filaments had a significantly enhanced SG/LG A15 ratio and no residual A15 in the core, a feature that opens a path to substantial J_c improvement.

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Research Organization:: Florida State Univ., Tallahassee, FL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF); CERN; State of Florida (United States)

Contributing Organization:: European Organization for Nuclear Research (CERN), Geneva (Switzerland); Bruker EAS GmbH, Hanau (Germany)

Grant/Contract Number:: SC0012083; FG02-07ER41451; KE1920; KN2713; NSF/DMR-1157490

OSTI ID:: 1271124

Alternate ID(s):: OSTI ID: 1256530

Report Number(s):: DOE-NHMFL-41451; FG02-07ER41451

Journal Information:: Superconductor Science and Technology, Vol. 29, Issue 8; Related Information: The PIT strand was supplied to us by the US LHC Accelerator Research Program (LARP), which is a BNL, FNAL, LBNL, and SLAC collaboration with CERN for the High Luminosity LHC program: http://www.uslarp.org/; ISSN 0953-2048

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 29 works

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Title: Evaluation of critical current density and residual resistance ratio limits in powder in tube Nb3Sn conductors

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Title: Evaluation of critical current density and residual resistance ratio limits in powder in tube Nb₃Sn conductors