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

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5 Author(s)
Walsh, R.P. ; Nat. High Magn. Field Lab., Florida State Univ., Tallahassee, FL, USA ; McRae, D. ; Markiewicz, W.D. ; Lu, J.
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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.

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:22 ,  Issue: 1 )

Date of Publication:

Feb. 2012

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