Frequency dependence of AC losses of AgAu/PbBi-2223 tapes with twisted filaments under perpendicular AC fields
Frequency dependence of AC losses of AgAu/PbBi-2223 tapes with twisted filaments under perpendicular AC fields
The frequency dependence of AC losses of multifilament Ag/Ag/PbBi-2223 tapes with twisted filaments has been measured under perpendicular AC fields at 77K. Tapes twisted at different pitches, Lp, from 4 to 15 mm, have been analyzed. The use of a high resistive sheath results in a reduction of losses by the uncoupling of filaments at fields below the coupling field, Bc. In this regime, the frequency dependence of the two main loss contributions: superconducting, Qs, and coupling current loss, QC has been obtained separately from the measurement of the different harmonics of the voltage induced in the pick-up coil. Moreover, the time constant characteristic of the coupling currents, as well as Bc(f) has been estimated for tapes with different twist pitches. A comparison between the experimental results and the theoretical predictions has been done.
ac losses, magnetic fields, superconductors, twisted multifilamentary tapes
2636
Yang, Y.
4cac858a-e0c0-4174-a839-05ca394fc51f
Martínez, E.
82f80714-92b3-4b5b-84ec-252b5eaa5ee7
Beduz, C.
2cbc6ece-3e8b-454b-86d6-3960596bd234
Huang, Y.
a6d20fd7-d95a-461a-81bc-ec4a714cf300
2001
Yang, Y.
4cac858a-e0c0-4174-a839-05ca394fc51f
Martínez, E.
82f80714-92b3-4b5b-84ec-252b5eaa5ee7
Beduz, C.
2cbc6ece-3e8b-454b-86d6-3960596bd234
Huang, Y.
a6d20fd7-d95a-461a-81bc-ec4a714cf300
Yang, Y., Martínez, E., Beduz, C. and Huang, Y.
(2001)
Frequency dependence of AC losses of AgAu/PbBi-2223 tapes with twisted filaments under perpendicular AC fields.
IEEE Transactions on Applied Superconductivity, 11 (1), .
Abstract
The frequency dependence of AC losses of multifilament Ag/Ag/PbBi-2223 tapes with twisted filaments has been measured under perpendicular AC fields at 77K. Tapes twisted at different pitches, Lp, from 4 to 15 mm, have been analyzed. The use of a high resistive sheath results in a reduction of losses by the uncoupling of filaments at fields below the coupling field, Bc. In this regime, the frequency dependence of the two main loss contributions: superconducting, Qs, and coupling current loss, QC has been obtained separately from the measurement of the different harmonics of the voltage induced in the pick-up coil. Moreover, the time constant characteristic of the coupling currents, as well as Bc(f) has been estimated for tapes with different twist pitches. A comparison between the experimental results and the theoretical predictions has been done.
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Published date: 2001
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Keywords:
ac losses, magnetic fields, superconductors, twisted multifilamentary tapes
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Local EPrints ID: 21468
URI: http://eprints.soton.ac.uk/id/eprint/21468
ISSN: 1051-8223
PURE UUID: aeff7b2d-8856-40d2-b768-e2c782d09560
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Date deposited: 13 Mar 2006
Last modified: 12 Dec 2021 02:47
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Author:
E. Martínez
Author:
C. Beduz
Author:
Y. Huang
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