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Thermometric measurements of the self-field losses in silver sheathed PbBi2223 multifilamentary tapes

Thermometric measurements of the self-field losses in silver sheathed PbBi2223 multifilamentary tapes
Thermometric measurements of the self-field losses in silver sheathed PbBi2223 multifilamentary tapes
Self-field ac losses in Ag sheathed PbBi-2223 tapes were measured using a thermometric method, which determines the losses by measuring the temperature profile of a vacuum insulated sample, with both ends at a fixed temperature. In practice, the samples were placed in a vacuum capsule immersed in LIN bath. By minimizing the bath superheat, thermal emf and heating at the current contacts, a loss induced temperature increase as low as 2 mK was measured using a Si diode thermometer. With a typical sample length of 600 mm, self-held losses between 7×10 -6 W/m and 4×10-3 W/m were measured at different frequencies. The results are in good agreement with both the electric measurement and theoretical calculation. This provides the first independent confirmation that electric measurement with carefully placed voltage loops can give the true losses of the sample.
bismuth compounds, calcium compounds, eddy current losses, high-temperature superconductors, lead compounds, multifilamentary superconductors, silver, strontium compounds Non-contro
1051-8223
1658-1661
Mahdi, A.E.
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Hughes, T.
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Beduz, C.
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Yang, Y.
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Stoll, R.L.
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Sykulski, J.K.
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Haldar, P.
dfbe9fb1-37dd-405c-867f-e9260f67e9fe
Sokolowski, R.S.
618d82ce-607a-4986-9627-94406cb55f16
Power, A.
4b4103a0-e489-44a1-bf28-d8e997a1eb4b
Mahdi, A.E.
8fc3a265-e137-4eab-a270-876bc30559b2
Hughes, T.
e7ab9d6a-57d7-45d3-9a1b-bc00df50432e
Beduz, C.
2cbc6ece-3e8b-454b-86d6-3960596bd234
Yang, Y.
0c661323-7e23-41c6-a9a2-b4479fd74ef1
Stoll, R.L.
0c13c491-3227-4f2d-af17-c1371795a11b
Sykulski, J.K.
d6885caf-aaed-4d12-9ef3-46c4c3bbd7fb
Haldar, P.
dfbe9fb1-37dd-405c-867f-e9260f67e9fe
Sokolowski, R.S.
618d82ce-607a-4986-9627-94406cb55f16
Power, A.
4b4103a0-e489-44a1-bf28-d8e997a1eb4b

Mahdi, A.E., Hughes, T., Beduz, C., Yang, Y., Stoll, R.L., Sykulski, J.K., Haldar, P., Sokolowski, R.S. and Power, A. (1997) Thermometric measurements of the self-field losses in silver sheathed PbBi2223 multifilamentary tapes. IEEE Transactions on Applied Superconductivity, 7 (2), 1658-1661. (doi:10.1109/77.620896).

Record type: Article

Abstract

Self-field ac losses in Ag sheathed PbBi-2223 tapes were measured using a thermometric method, which determines the losses by measuring the temperature profile of a vacuum insulated sample, with both ends at a fixed temperature. In practice, the samples were placed in a vacuum capsule immersed in LIN bath. By minimizing the bath superheat, thermal emf and heating at the current contacts, a loss induced temperature increase as low as 2 mK was measured using a Si diode thermometer. With a typical sample length of 600 mm, self-held losses between 7×10 -6 W/m and 4×10-3 W/m were measured at different frequencies. The results are in good agreement with both the electric measurement and theoretical calculation. This provides the first independent confirmation that electric measurement with carefully placed voltage loops can give the true losses of the sample.

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More information

Published date: 1997
Keywords: bismuth compounds, calcium compounds, eddy current losses, high-temperature superconductors, lead compounds, multifilamentary superconductors, silver, strontium compounds Non-contro
Organisations: EEE

Identifiers

Local EPrints ID: 253597
URI: https://eprints.soton.ac.uk/id/eprint/253597
ISSN: 1051-8223
PURE UUID: fcff6e4e-df8d-4161-98af-3fc2ac29bbe9
ORCID for J.K. Sykulski: ORCID iD orcid.org/0000-0001-6392-126X

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Date deposited: 10 Oct 2003
Last modified: 18 Jul 2019 16:04

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