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The extended E-J characteristics of flux diffusion and their role in the self-field AC losses in Ag-sheathed PbBi2223 tapes

The extended E-J characteristics of flux diffusion and their role in the self-field AC losses in Ag-sheathed PbBi2223 tapes
The extended E-J characteristics of flux diffusion and their role in the self-field AC losses in Ag-sheathed PbBi2223 tapes
The interplay between the flux pinning of the critical state and flux diffusion has an important effect on the hysteresis losses at high frequencies (>200Hz). This interplay between the two mechanisms has been seen in the dB/dt dependence of the magnetization and AC losses in a varying external field. In order to study this effect in the self-field situation we have separated the eddy current losses and hysteresis losses, of an Ag-sheathed PbBi2223 tape, by making measurements of the 1st and 3rd harmonics of the electric field, at various frequencies. These measurements show as expected that the hysteresis loss per cycle decreases for increasing frequency. Our data shows that, for a given frequency and transport current, there exists an equivalent critical current, which when plotted against the corresponding loss electric field is coincident with the DC E-J characteristics of the tape. This demonstrates that the hysteresis losses are determined by the extended E-J characteristics of the tape.
0921-4534
2593-2594
Hughes, T.
e7ab9d6a-57d7-45d3-9a1b-bc00df50432e
Yang, Y.
0c661323-7e23-41c6-a9a2-b4479fd74ef1
Spiller, D.M.
67e058fd-5428-4918-9cec-43a45a449516
Fisher, S.
2854ae55-11c7-4583-a4d4-860404f92ae4
Beduz, C.
15245681-77b5-4b29-a8fc-23296f13bc57
Hughes, T.
e7ab9d6a-57d7-45d3-9a1b-bc00df50432e
Yang, Y.
0c661323-7e23-41c6-a9a2-b4479fd74ef1
Spiller, D.M.
67e058fd-5428-4918-9cec-43a45a449516
Fisher, S.
2854ae55-11c7-4583-a4d4-860404f92ae4
Beduz, C.
15245681-77b5-4b29-a8fc-23296f13bc57

Hughes, T., Yang, Y., Spiller, D.M., Fisher, S. and Beduz, C. (1997) The extended E-J characteristics of flux diffusion and their role in the self-field AC losses in Ag-sheathed PbBi2223 tapes. Physica C: Superconductivity and its Applications, 282-287 (4), 2593-2594. (doi:10.1016/S0921-4534(97)01391-9).

Record type: Article

Abstract

The interplay between the flux pinning of the critical state and flux diffusion has an important effect on the hysteresis losses at high frequencies (>200Hz). This interplay between the two mechanisms has been seen in the dB/dt dependence of the magnetization and AC losses in a varying external field. In order to study this effect in the self-field situation we have separated the eddy current losses and hysteresis losses, of an Ag-sheathed PbBi2223 tape, by making measurements of the 1st and 3rd harmonics of the electric field, at various frequencies. These measurements show as expected that the hysteresis loss per cycle decreases for increasing frequency. Our data shows that, for a given frequency and transport current, there exists an equivalent critical current, which when plotted against the corresponding loss electric field is coincident with the DC E-J characteristics of the tape. This demonstrates that the hysteresis losses are determined by the extended E-J characteristics of the tape.

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Published date: 1997

Identifiers

Local EPrints ID: 21290
URI: http://eprints.soton.ac.uk/id/eprint/21290
ISSN: 0921-4534
PURE UUID: 409d8892-2745-4077-a9e0-1b97ac687ef1

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Date deposited: 17 Nov 2006
Last modified: 15 Mar 2024 06:29

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Contributors

Author: T. Hughes
Author: Y. Yang
Author: D.M. Spiller
Author: S. Fisher
Author: C. Beduz

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