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Direct method of measuring ac losses in superconducting tapes, simultaneously subjected to ac current and ac magnetic field

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3 Author(s)
Y. Bugoslavsky ; Centre for High-Temp. Supercond., Imperial Coll., London, UK ; M. Polichetti ; A. D. Caplin

A novel technique for measuring ac losses in short lengths of high-temperature-superconductor tapes is presented. The principle of operation is based on the direct detection of the heating produced by the losses. In the presented system a tape can be subjected to current up to 40 A rms and ac magnetic field up to 600 mT rms, with an arbitrary phase between them; the measurements are made at 77 K. The noise floor is of the order of 1 μW/cm. A number of test experiments are presented, which prove the validity of the technique.

Published in:

IEEE Transactions on Applied Superconductivity  (Volume:13 ,  Issue: 2 )