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Experimental study of loss mechanisms of AgAu/PbBi-2223 tapes with twisted filaments under perpendicular AC magnetic fields at power frequencies

Experimental study of loss mechanisms of AgAu/PbBi-2223 tapes with twisted filaments under perpendicular AC magnetic fields at power frequencies
Experimental study of loss mechanisms of AgAu/PbBi-2223 tapes with twisted filaments under perpendicular AC magnetic fields at power frequencies
AC losses under perpendicular AC fields have been measured at 77 K and power frequencies for multifilamentary AgAu (10 wt.%)/Bi-2223 tapes with filaments twisted at different pitches. Using simultaneous measurements of the first and higher harmonics of the voltage induced in the pick-up coil, the main loss contributions (superconductor and coupling current losses) have been obtained separately. At power frequencies, twisting produces the desired uncoupling of the filaments at fields lower than the coupling field, which has also been determined experimentally. In the uncoupled-filament regime, the superconductor losses are reduced strongly with respect to the untwisted tapes. The reduction of the total loss with twisting is also observed. However, due to the important contribution of the coupling current losses for this field orientation, a very small pitch (<5 mm) is necessary for a considerably lower loss than that of untwisted tapes. The dependence of the coupling field and coupling current losses on the twist pitch has been analysed and compared with the theoretical predictions.
ac losses, multifilamentary superconducting tapes, magnetization, twisting
0921-4534
216-226
Martinez, E.
67ed8d9b-3213-4797-aeae-1c9e6985e48f
Yang, Y.
4cac858a-e0c0-4174-a839-05ca394fc51f
Beduz, C.
2cbc6ece-3e8b-454b-86d6-3960596bd234
Huang, Y.B.
fc445475-0562-47d1-b266-060496881389
Martinez, E.
67ed8d9b-3213-4797-aeae-1c9e6985e48f
Yang, Y.
4cac858a-e0c0-4174-a839-05ca394fc51f
Beduz, C.
2cbc6ece-3e8b-454b-86d6-3960596bd234
Huang, Y.B.
fc445475-0562-47d1-b266-060496881389

Martinez, E., Yang, Y., Beduz, C. and Huang, Y.B. (2000) Experimental study of loss mechanisms of AgAu/PbBi-2223 tapes with twisted filaments under perpendicular AC magnetic fields at power frequencies. Physica C: Superconductivity and its Applications, 331 (3-4), 216-226. (doi:10.1016/S0921-4534(00)00028-9).

Record type: Article

Abstract

AC losses under perpendicular AC fields have been measured at 77 K and power frequencies for multifilamentary AgAu (10 wt.%)/Bi-2223 tapes with filaments twisted at different pitches. Using simultaneous measurements of the first and higher harmonics of the voltage induced in the pick-up coil, the main loss contributions (superconductor and coupling current losses) have been obtained separately. At power frequencies, twisting produces the desired uncoupling of the filaments at fields lower than the coupling field, which has also been determined experimentally. In the uncoupled-filament regime, the superconductor losses are reduced strongly with respect to the untwisted tapes. The reduction of the total loss with twisting is also observed. However, due to the important contribution of the coupling current losses for this field orientation, a very small pitch (<5 mm) is necessary for a considerably lower loss than that of untwisted tapes. The dependence of the coupling field and coupling current losses on the twist pitch has been analysed and compared with the theoretical predictions.

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More information

Published date: 2000
Keywords: ac losses, multifilamentary superconducting tapes, magnetization, twisting

Identifiers

Local EPrints ID: 21464
URI: http://eprints.soton.ac.uk/id/eprint/21464
ISSN: 0921-4534
PURE UUID: da59c53f-4aaa-4444-bda3-a03c3f5500fe
ORCID for Y. Yang: ORCID iD orcid.org/0000-0002-3874-6735

Catalogue record

Date deposited: 07 Feb 2007
Last modified: 16 Mar 2024 02:44

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Contributors

Author: E. Martinez
Author: Y. Yang ORCID iD
Author: C. Beduz
Author: Y.B. Huang

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