High-temperature superconducting CORC® wires with record-breaking axial tensile strain tolerance present a breakthrough for high-field magnets

van der Laan, D. C.; Radcliff, K.; Anvar, V. A.; Wang, K.; Nijhuis, A.; Weiss, J. D.

doi:10.1088/1361-6668/ac1aae

Title: High-temperature superconducting CORC^® wires with record-breaking axial tensile strain tolerance present a breakthrough for high-field magnets

Journal Article · 12 September 2021 · Superconductor Science and Technology

DOI: https://doi.org/10.1088/1361-6668/ac1aae · OSTI ID:1979320

^[1]; Radcliff, K. ^[2]; Anvar, V. A. ^[3]; Wang, K. ^[3];

^[3]; Weiss, J. D. ^[4]

Advanced Conductor Technologies LLC, Boulder, CO (United States); University of Colorado, Boulder, CO (United States); OSTI
Advanced Conductor Technologies LLC, Boulder, CO (United States)
University of Twente, Enschede (The Netherlands)
Advanced Conductor Technologies LLC, Boulder, CO (United States); University of Colorado, Boulder, CO (United States)

Cuprate high-temperature superconductors (HTS), such as RE-Ba₂Cu₃O_7–δ (REBCO, RE = rare earth), (Bi,Pb)₂Sr₂Ca₂Cu₃O_10–x and Bi₂Sr₂CaCu₂O_8–x, have enabled the development of high-field superconducting magnets capable of generating magnetic fields far exceeding 20 T. The brittle nature of HTS requires elaborate means to protect them against the high stresses and strains associated with high-field magnet operation, and so far, has prevented reliable high-field HTS magnets from becoming a reality. Here we report a more than tenfold increase in the irreversible strain limit under axial tension (epsilonirr) to over 7% in optimized high-current conductor on round core (CORC®) conductors, compared to the REBCO tapes from which the CORC® conductor is wound. Minimizing the tape winding pitch of the helical wind mechanically decouples the brittle REBCO film from the overall conductor. The REBCO tapes behave as springs, limiting the rate at which applied strain is transferred to the ceramic film. In addition, high-strength alloy cores allow the critical stress (ϵ_crit) under axial tension at which initial degradation of CORC® conductors occurs to exceed 600 MPa, making them one of the strongest superconductors available. Mechanically decoupling the ceramic REBCO films from the overall CORC® conductor allows effective protection against the high operating stresses in high-field magnets. Furthermore, this breakthrough presents a monumental shift for HTS magnet technology, bringing reliable high-field superconducting magnets for compact fusion machines, the next generation of particle accelerators, and 40–60 T research solenoids within reach.

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Research Organization:: Advanced Conductor Technologies LLC, Boulder, CO (United States); University of Colorado, Boulder, CO (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: SC0014009; SC0018125; SC0020710

OSTI ID:: 1979320

Journal Information:: Superconductor Science and Technology, Journal Name: Superconductor Science and Technology Journal Issue: 10 Vol. 34; ISSN 0953-2048

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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record irreversible strain limit

Title: High-temperature superconducting CORC® wires with record-breaking axial tensile strain tolerance present a breakthrough for high-field magnets

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Title: High-temperature superconducting CORC^® wires with record-breaking axial tensile strain tolerance present a breakthrough for high-field magnets