Voltage-probe-position dependence and magnetic-flux contribution to the measured voltage in ac transport measurements [electronic resource] : which measuring circuit determines the real losses?
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| Online Access: |
Online Access |
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| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Washington, D.C. : Oak Ridge, Tenn. :
United States. Dept. of Energy ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy,
1995.
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| Subjects: |
| Abstract: | 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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| Item Description: | Published through the Information Bridge: DOE Scientific and Technical Information. 12/31/1995. "IS-M--845" "CONF-9509255--4" "DE96006797" 1. Polish-US conference on high temperature superconductivity, Wroclaw (Poland), 11-15 Sep 1995. McDonald, J.; Clem, J.R.; Pe, T. |
| Physical Description: | 6 p. |