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Study of AC loss mechanisms by systematically etching the Ag matrix in PbBi2223 tapes with twisted filaments

Study of AC loss mechanisms by systematically etching the Ag matrix in PbBi2223 tapes with twisted filaments
Study of AC loss mechanisms by systematically etching the Ag matrix in PbBi2223 tapes with twisted filaments
The main obstacle to an effective loss reduction in standard PbBi2223 tapes is the low resistivity of the pure Ag sheath, which leads to a low critical coupling field and a high coupling current loss. To formulate an effective loss reduction strategy, it is important to assess the contribution of different loss mechanisms. The aim of the present work is to quantify the distribution of the coupling current by systematic removal of Ag using chemical etching. Our result showed that the majority of the coupling current flows transversely through the superconductor-Ag matrix, instead of the outer sheath enclosing the filaments. It was also found that the coupling field BC between the filaments and the inverse of the time constant of coupling current ??1 increase linearly with the percentage of etching, while the matrix resistivity for the un-etched area is expected to change very little. By completely uncoupling about a half of all the filaments, the reduction of the total loss was about 40–50% in the coupling-current dominated regime with filament uncoupled. The loss reduction for partially coupled regime is more than 80%.
ac loss, twisting, hts tapes
0921-4534
1766-1770
Martinez, M.
3d1e9d74-42df-497a-a28d-3421818c6e92
Yang, Y.
4cac858a-e0c0-4174-a839-05ca394fc51f
Young, E.
d3a881b0-a564-41f5-9843-34ae86da360f
Beduz, C.
2cbc6ece-3e8b-454b-86d6-3960596bd234
Huang, Y.B.
fc445475-0562-47d1-b266-060496881389
Martinez, M.
3d1e9d74-42df-497a-a28d-3421818c6e92
Yang, Y.
4cac858a-e0c0-4174-a839-05ca394fc51f
Young, E.
d3a881b0-a564-41f5-9843-34ae86da360f
Beduz, C.
2cbc6ece-3e8b-454b-86d6-3960596bd234
Huang, Y.B.
fc445475-0562-47d1-b266-060496881389

Martinez, M., Yang, Y., Young, E., Beduz, C. and Huang, Y.B. (2002) Study of AC loss mechanisms by systematically etching the Ag matrix in PbBi2223 tapes with twisted filaments. Physica C: Superconductivity and its Applications, 372-376 (3), 1766-1770. (doi:10.1016/S0921-4534(02)01122-X).

Record type: Article

Abstract

The main obstacle to an effective loss reduction in standard PbBi2223 tapes is the low resistivity of the pure Ag sheath, which leads to a low critical coupling field and a high coupling current loss. To formulate an effective loss reduction strategy, it is important to assess the contribution of different loss mechanisms. The aim of the present work is to quantify the distribution of the coupling current by systematic removal of Ag using chemical etching. Our result showed that the majority of the coupling current flows transversely through the superconductor-Ag matrix, instead of the outer sheath enclosing the filaments. It was also found that the coupling field BC between the filaments and the inverse of the time constant of coupling current ??1 increase linearly with the percentage of etching, while the matrix resistivity for the un-etched area is expected to change very little. By completely uncoupling about a half of all the filaments, the reduction of the total loss was about 40–50% in the coupling-current dominated regime with filament uncoupled. The loss reduction for partially coupled regime is more than 80%.

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More information

Published date: 2002
Keywords: ac loss, twisting, hts tapes

Identifiers

Local EPrints ID: 22431
URI: http://eprints.soton.ac.uk/id/eprint/22431
ISSN: 0921-4534
PURE UUID: 6fdfa2c6-5022-498f-85cf-ee4ec56d9fc6
ORCID for Y. Yang: ORCID iD orcid.org/0000-0002-3874-6735

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Date deposited: 22 Mar 2006
Last modified: 07 Oct 2020 01:37

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Contributors

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

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