The 77-K Stress and Strain Dependence of the Critical Current of YBCO Coated Conductors and Lap Joints

The electromechanical performance of commercially available YBCO high-temperature superconductor (HTS) is characterized in support of the 32T all-superconducting magnet program at the National High Magnetic Field Laboratory. Accurate characterization of the HTS coated conductors mechanical propertie...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2012-02, Vol.22 (1), p.8400406-8400406
Main Authors: Walsh, R. P., McRae, D., Markiewicz, W. D., Lu, J., Toplosky, V. J.
Format: Article
Language:English
Subjects:
Axial strain
Conductors
Copper
COPPER OXIDE
critical current density
ELECTRICAL CONDUCTORS
Integrated circuits
JOINTS
Lap joints
MAGNETIC FIELD
Magnetic fields
MAGNETIC PROPERTIES
PROPERTIES
STRAIN
STRESS
Stress-strain relationships
Stresses
super conducting magnets
Superconducting magnets
Superconductivity
SUPERCONDUCTORS
tensile stress
YBCO coated conductor
YBCO superconductors
YTTRIUM OXIDE
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Summary:The electromechanical performance of commercially available YBCO high-temperature superconductor (HTS) is characterized in support of the 32T all-superconducting magnet program at the National High Magnetic Field Laboratory. Accurate characterization of the HTS coated conductors mechanical properties are essential for the aggressive high-field magnet design. Here, we report the 77-K stress-strain behavior of a series of conductors with varying thickness coatings of copper. The electromechanical performance of the conductors is determined in tests to measure the critical current as a function of applied axial strain, at 77-K in self field. Available conductor lengths necessitate a magnet design with soldered lap joints and the subsequent evaluation the lap joint performance reported here. Reports of low transverse strength and conductor delamination due transverse ( c -axis) tensile stress prompted tests to measure the conductors' electrical performance in the presence of transverse stress that are also reported.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2011.2182349