Influence of strain on Nb3Sn multifilament conductors

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Abstract
In Nb3Sn multifilament conductors, the superconducting component is subjected to compressive stress. This affects both the superconducting critical temperature and the critical current. After removal of the matrix by a chemical treatment, the degradation of the critical temperature is partly reversed and the critical current increases. With the aid of a model, which takes into account the plastic behavior of the components, the strains resulting from thermal shrinkage are calculated. The resulting degradation of Tc and the measured Tc values are in fairly good agreement. The strain‐dependent change of critical current is solely caused by a change of the upper critical field; the pinning force function remained almost unaltered.