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


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).

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Description/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.

Item Type: Article
Keywords: bismuth compounds, calcium compounds, eddy current losses, high-temperature superconductors, lead compounds, multifilamentary superconductors, silver, strontium compounds Non-contro
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: University Structure - Pre August 2011 > School of Electronics and Computer Science
University Structure - Pre August 2011 > School of Engineering Sciences
ePrint ID: 21067
Date Deposited: 27 Mar 2006
Last Modified: 27 Mar 2014 18:10
Contact Email Address: cb3@mech.soton.ac.uk
URI: http://eprints.soton.ac.uk/id/eprint/21067

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