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AC losses in a composite tubular superconductor for power transmission

✍ Scribed by J.A. Baylis; K.G. Lewis; J.C. Male; J.A. Noé

Publisher
Elsevier Science
Year
1974
Tongue
English
Weight
320 KB
Volume
14
Category
Article
ISSN
0011-2275

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✦ Synopsis

AC losses have been measured as a function of current and temperature in a 63.5 mm diameter niobium/copper composite tube, forming the inner conductor of a co-axial superconducting transmission line. The conductor has a 2.6 mm thick substrate of highconductivity copper with a 50 #m thick niobium surface layer bonded by coextrusion and cold-drawing. Closed-cycle refrigeration allowed losses to be measured as a continuous function of temperature between 4. 4 and 8.0 K for surface current densities between 23 and 89 A mm "1. Losses were less than O. 1 Wm "2 at 5 K for surface current densities less than 50 A mm" 1, and obeyed approximately the empirical relation: loss oc h 7 where h is the ratio of surface current density to Hc2 for the superconductor.

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