Evaluation of copper to superconductor area ratio measurement techniques for niobium-titanium composite superconducting wire Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/gm80j094k

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  • Measurement of the copper to superconductor ratio (Cu/SC) in composite superconducting wires is necessary for process control, quality assurance, and characterization of the final wire properties. A comparison has been made of three techniques for measuring the Cu/SC ratio on a set of commercial wires produced for the Superconducting SuperCollider (SSC) Laboratory. The simplest and most straightforward technique, chemical etching, was found to display the best reproducibility, while the electrical resistivity technique shows the most variation and sensitivity to measurement errors, as well as being the most difficult to perform. The image analysis technique is fast and fairly reproducible, and is capable of providing much more information on the wire parameters than either of the other techniques.
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