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

Journal Article · · Superconductor Science and Technology
ORCiD logo [1];  [2];  [3];  [3]; ORCiD logo [3];  [1]
  1. Advanced Conductor Technologies LLC, Boulder, CO (United States); University of Colorado, Boulder, CO (United States)
  2. Advanced Conductor Technologies LLC, Boulder, CO (United States)
  3. University of Twente, Enschede (The Netherlands)

Cuprate high-temperature superconductors (HTS), such as RE-Ba2Cu3O7–δ (REBCO, RE = rare earth), (Bi,Pb)2Sr2Ca2Cu3O10–x and Bi2Sr2CaCu2O8–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 (ϵcrit) 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.

Research Organization:
Univ. of Colorado, Boulder, CO (United States); Advanced Conductor Technologies LLC, 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, Vol. 34, Issue 10; ISSN 0953-2048
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

References (32)

Reversible effect of strain on transport critical current in Bi 2 Sr 2 CaCu 2 O 8 + x superconducting wires: a modified descriptive strain model journal December 2011
The EuCARD-2 Future Magnets European Collaboration for Accelerator-Quality HTS Magnets journal June 2015
Development and performance of a 2.9 Tesla dipole magnet using high-temperature superconducting CORC ® wires journal December 2020
High-Performance Bi-2212 Round Wires Made With Recent Powders journal August 2019
High critical current density superconducting tapes by epitaxial deposition of YBa2Cu3Ox thick films on biaxially textured metals journal September 1996
A CORC ® cable insert solenoid: the first high-temperature superconducting insert magnet tested at currents exceeding 4 kA in 14 T background magnetic field journal April 2020
Angular-dependent vortex pinning mechanisms in YBa2Cu3O7 coated conductors and thin films journal March 2004
Powering of an HTS dipole insert-magnet operated standalone in helium gas between 5 and 85 K journal April 2018
YBa 2 Cu 3 O 7−δ coated conductor cabling for low ac-loss and high-field magnet applications journal April 2009
Critical Current Density in Superconducting$rm Nb-Ti$Strands in the 100 mT to 11 T Applied Field Range journal June 2006
In‐plane aligned YBa 2 Cu 3 O 7− x thin films deposited on polycrystalline metallic substrates journal February 1992
Compact fusion energy based on the spherical tokamak journal November 2017
High field Nb/sub 3/ Sn conductor development at oxford superconducting technology journal June 2003
Experiments and FE modeling of stress–strain state in ReBCO tape under tensile, torsional and transverse load journal March 2015
Large intrinsic effect of axial strain on the critical current of high-temperature superconductors for electric power applications journal January 2007
Introduction of CORC ® wires: highly flexible, round high-temperature superconducting wires for magnet and power transmission applications journal November 2016
Isotropic round-wire multifilament cuprate superconductor for generation of magnetic fields above 30 T journal March 2014
The 40 T Superconducting Magnet Project at the National High Magnetic Field Laboratory journal June 2020
ARC: A compact, high-field, fusion nuclear science facility and demonstration power plant with demountable magnets journal November 2015
Test Results of the 36 T, 1 ppm Series-Connected Hybrid Magnet System at the NHMFL journal August 2019
Stress–Strain Relationship, Critical Strain (Stress) and Irreversible Strain (Stress) of IBAD-MOCVD-Based 2G HTS Wires Under Uniaxial Tension journal June 2016
Grain boundaries in high-Tc superconductors journal May 2002
A 1.2 T canted cos θ dipole magnet using high-temperature superconducting CORC ® wires journal May 2019
45.5-tesla direct-current magnetic field generated with a high-temperature superconducting magnet journal June 2019
Mechanisms for critical-current degradation in NbTi and Nb<inf>3</inf>Sn multifilamentary wires journal January 1977
Evidence that the reversible strain effect on critical current density and flux pinning in Bi2Sr2Ca2Cu3Oxtapes is caused entirely by the pressure dependence of the critical temperature journal December 2010
Characterization of a high-temperature superconducting conductor on round core cables in magnetic fields up to 20 T journal February 2013
Correlation Between Pressure Dependence of Critical Temperature and the Reversible Strain Effect on the Critical Current and Pinning Force in $\hbox{Bi}_{2}\hbox{Sr}_{2} \hbox{CaCu}_{2}\hbox{O}_{8 + x}$ Wires journal February 2012
Anisotropic in-plane reversible strain effect in Y0.5Gd0.5Ba2Cu3O7 − δcoated conductors journal October 2011
Status of CORC ® cables and wires for use in high-field magnets and power systems a decade after their introduction journal February 2019
Precipitous change of the irreversible strain limit with heat-treatment temperature in Nb3Sn wires made by the restacked-rod process journal August 2018
Conceptual Design Optimization of a 60 T Hybrid Magnet journal June 2020