DocumentCode :
850554
Title :
AC losses in high T/sub c/ superconductors
Author :
Campbell, A.M.
Author_Institution :
Interdisciplinary Res. Centre in Superconductivity, Cambridge Univ., UK
Volume :
5
Issue :
2
fYear :
1995
fDate :
6/1/1995 12:00:00 AM
Firstpage :
682
Lastpage :
687
Abstract :
The losses in high T/sub c/ superconductors do not differ in principle from those in low T/sub c/ materials, and the same calculations can be used. However it is necessary to allow for the granularity of the materials and the high aspect ratio of the conductors. This paper derives simple, if approximate, expressions for calculating the losses in the most important cases for practical purposes. These are the use of BSCCO tapes in magnets and cables at power frequencies. The predictions of elliptical and thin strip models are compared and it is found that an elliptical geometry agrees best with the experimental results. It is also found that the voltage measured in a transport measurement depends on the position of the contacts and that if an unambiguous loss measurement is required it is necessary to include the flux outside the sample in the voltage measurement loop.<>
Keywords :
bismuth compounds; calcium compounds; high-temperature superconductors; loss measurement; losses; power cable testing; strontium compounds; superconducting cables; superconducting magnets; voltage measurement; AC losses; BiSrCaCuO; aspect ratio; cables; elliptical models; geometry; granularity; high T/sub c/ superconductors; loss measurement; magnets; power frequencies; thin strip models; transport measurement; voltage measurement; Bismuth compounds; Cables; Conducting materials; Granular superconductors; Loss measurement; Magnetic materials; Magnets; Position measurement; Superconducting materials; Voltage measurement;
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/77.402640
Filename :
402640
Link To Document :
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