Voltage-probe-position dependence and magnetic-flux contribution to the measured voltage in ac transport measurements: which measuring circuit determines the real losses?

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The voltage V{sub ab} measured between two voltage taps a and b during magnetic flux transport in a type-II superconductor carrying current I is the sum of two contributions, the line integral from a to b of the electric field along an arbitrary path C{sub s} through the superconductor and a term proportional to the time rate of change of magnetic flux through the area bounded by the path C{sub s} and the measuring circuit leads. When the current I(t) is oscillating with time t, the apparent ac loss (the time average of the product IV{sub ab}) depends upon the ... continued below

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6 p.

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Pe, T.; McDonald, J. & Clem, J.R. December 31, 1995.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 22 times , with 4 in the last month . More information about this article can be viewed below.

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  • Ames Laboratory
    Publisher Info: Ames Lab., IA (United States)
    Place of Publication: Iowa

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Description

The voltage V{sub ab} measured between two voltage taps a and b during magnetic flux transport in a type-II superconductor carrying current I is the sum of two contributions, the line integral from a to b of the electric field along an arbitrary path C{sub s} through the superconductor and a term proportional to the time rate of change of magnetic flux through the area bounded by the path C{sub s} and the measuring circuit leads. When the current I(t) is oscillating with time t, the apparent ac loss (the time average of the product IV{sub ab}) depends upon the measuring circuit used. Only when the measuring-circuit leads are brought out far from the surface does the apparent power dissipation approach the real (or true) ac loss associated with the length of sample probed. Calculations showing comparisons between the apparent and real ac losses in a flat strip of rectangular cross section will be presented, showing the behavior as a function of the measuring-circuit dimensions. Corresponding calculations also are presented for a sample of elliptical cross section.

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6 p.

Notes

INIS; OSTI as DE96006797

Source

  • 1. Polish-US conference on high temperature superconductivity, Wroclaw (Poland), 11-15 Sep 1995

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  • Other: DE96006797
  • Report No.: IS-M--845
  • Report No.: CONF-9509255--4
  • Grant Number: W-7405-ENG-82
  • Office of Scientific & Technical Information Report Number: 206443
  • Archival Resource Key: ark:/67531/metadc671315

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  • December 31, 1995

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  • June 29, 2015, 9:42 p.m.

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  • Dec. 4, 2015, 8:48 p.m.

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Pe, T.; McDonald, J. & Clem, J.R. Voltage-probe-position dependence and magnetic-flux contribution to the measured voltage in ac transport measurements: which measuring circuit determines the real losses?, article, December 31, 1995; Iowa. (digital.library.unt.edu/ark:/67531/metadc671315/: accessed September 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.