Abstract
A systematic study of the effect of sample mounting techniques on the superconducting critical-current measurement was made. A seemingly small change in mandrel geometry can result in a 40% change in the measured critical current of a Nb/sub 3/Sn sample at 12 T. This is a result of a change in the conductor prestrain at 4 K caused by variation in thermal contraction between thick-and thin-walled fiberglass-epoxy composite (G-10) tubes. An approximate measure of the vibrations in thermal contraction (from room to liquid-nitrogen temperature) indicate a 0.2% greater contraction for the thick-walled tube. This difference, combined with strain sensitivity measurements, is consistent with the observed decrease in critical current.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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