Graduate Thesis Or Dissertation
 

Critical current distributions and the V(1) transition in Nb-Ti superconducting composites

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  • It is well established that the extended range V(I) transition behavior in filamentary superconducting composites depends strongly on the processing conditions of the composite. Based on previous work, a model proposed by Warnes et al predicts that the second derivative of the V(I) transition is related to a more fundamental property the critical current distribution in the composite. The present work consolidates the said model by showing that in spite of the V(I) transition being dependent on the matrix resistance, the second derivative is relatively independent. Also, the second derivative V(I) curve has been correlated to the critical current distributions and area distributions in monofilament and multifilamentary superconductors, using image analysis techniques. The work provides a better understanding of the critical current distributions in composite superconductors and can be an effective tool for measuring conductor quality more precisely. In addition to this, image analysis techniques have been used to study the effect of processing on the structure of wires - and have been related to the predictions of a model of inplane stresses in composites.
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