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Experimental study on AC losses in Ag sheathed PbBi2223 tapes with twist filaments

Experimental study on AC losses in Ag sheathed PbBi2223 tapes with twist filaments
Experimental study on AC losses in Ag sheathed PbBi2223 tapes with twist filaments
Experimental measurements of AC losses were carried out on Ag sheathed PbBi2223 tapes with twisted and untwisted filaments. Losses were measured at 77 K as function of frequency and magnetic field parallel and perpendicular to the tape surface, using appropriate pick-up loops. Both the first and third harmonics of the signal were measured, in order to distinguish between the hysteresis loss and other types of loss. The effect of filaments uncoupling by twisting was clearly identified. For a tape with a twist pitch of 10 mm and Ic=40 A (~20 kA cm?2) operating at 43 Hz, the filaments are uncoupled in fields less than 40 mT, which is greater than the full penetration field for both the filaments and the tape. Hence, a reduction in the hysteretic loss of the superconducting core is realised at power frequency between 10 and 40 mT. Results form the self-field loss measurement implies the uncoupling of twisted filaments at relative low transport current (I<0.5Ic)
Bi-2223 tape, twist, transport ac loss, frequency dependence, magnetic field dependence
0921-4534
147-153
Yang, Y.
0c661323-7e23-41c6-a9a2-b4479fd74ef1
Hughes, T.J.
831a1967-aad9-4bc9-bced-1048718ef372
Beduz, C.
15245681-77b5-4b29-a8fc-23296f13bc57
Darmann, F.
1bb0e238-0fb7-467e-9c6d-a4cc90dfc4ce
Yang, Y.
0c661323-7e23-41c6-a9a2-b4479fd74ef1
Hughes, T.J.
831a1967-aad9-4bc9-bced-1048718ef372
Beduz, C.
15245681-77b5-4b29-a8fc-23296f13bc57
Darmann, F.
1bb0e238-0fb7-467e-9c6d-a4cc90dfc4ce

Yang, Y., Hughes, T.J., Beduz, C. and Darmann, F. (1998) Experimental study on AC losses in Ag sheathed PbBi2223 tapes with twist filaments. Physica C: Superconductivity and its Applications, 310 (1-4), 147-153. (doi:10.1016/S0921-4534(98)00451-1).

Record type: Article

Abstract

Experimental measurements of AC losses were carried out on Ag sheathed PbBi2223 tapes with twisted and untwisted filaments. Losses were measured at 77 K as function of frequency and magnetic field parallel and perpendicular to the tape surface, using appropriate pick-up loops. Both the first and third harmonics of the signal were measured, in order to distinguish between the hysteresis loss and other types of loss. The effect of filaments uncoupling by twisting was clearly identified. For a tape with a twist pitch of 10 mm and Ic=40 A (~20 kA cm?2) operating at 43 Hz, the filaments are uncoupled in fields less than 40 mT, which is greater than the full penetration field for both the filaments and the tape. Hence, a reduction in the hysteretic loss of the superconducting core is realised at power frequency between 10 and 40 mT. Results form the self-field loss measurement implies the uncoupling of twisted filaments at relative low transport current (I<0.5Ic)

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More information

Published date: 1998
Keywords: Bi-2223 tape, twist, transport ac loss, frequency dependence, magnetic field dependence

Identifiers

Local EPrints ID: 21280
URI: http://eprints.soton.ac.uk/id/eprint/21280
ISSN: 0921-4534
PURE UUID: 30a2cad3-1ef4-491c-ae2a-dfa723d6e0b1

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Date deposited: 17 Nov 2006
Last modified: 15 Jul 2019 19:24

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Contributors

Author: Y. Yang
Author: T.J. Hughes
Author: C. Beduz
Author: F. Darmann

University divisions

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