Abstract
Superconducting switches operating on the basis of superconducting-to-normal transitions are considered as a means of initiating high power pulsed discharges from inductive energy storage systems. An analysis of transition times, power losses, and design techniques is presented. Thermally and magnetically activated switches, consisting of long, noninductively wound 0.005-in. Nb-25% Zr wires, with normal resistances in the kilohm region, have been tested. A linear representation of the reappearance of resistance during a superconducting-to-normal transition yielded values up to 105 Ω/sec. A mathematical analysis, which is in good agreement with experimental results, is given. Factors influencing the rate of increase of resistance are reviewed.
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