Bolometric measurement of ac loss in HTS tapes: a novel approach of microwatt sensitivity

Measurements of ac loss on superconducting tapes are important, but non-trivial. It is well known that in the potential tap method the ac voltage contains a large reactive component, and that its magnitude depends upon the current distribution and the position of the voltage contacts; these are part...

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Bibliographic Details
Published in:Superconductor science & technology 2000-07, Vol.13 (7), p.1062-1066
Main Authors: Chakraborty, N, Volkozub, A V, Caplin, A D
Format: Article
Language:English
Subjects:
Applied sciences
Electronics
Exact sciences and technology
Materials
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Summary:Measurements of ac loss on superconducting tapes are important, but non-trivial. It is well known that in the potential tap method the ac voltage contains a large reactive component, and that its magnitude depends upon the current distribution and the position of the voltage contacts; these are particularly uncertain in multi-filamentary conductors. Bolometric measurements of ac loss are intrinsically more reliable, but previous approaches have required long lengths (approx. 1 m) of conductor, which introduces other complications. We describe a novel bolometric technique that measures ac losses of HTS tape samples only a few centimetres in length. It has a sensitivity approaching 10 super(-4) W m super(-1), and can be used over a wide frequency range; a single measurement can be taken in 1 min or less. It may be adapted for measurements of short-sample losses in the presence also of an ac magnetic field.
ISSN:0953-2048
1361-6668
DOI:10.1088/0953-2048/13/7/327