Method for determining temperatures and heat transfer coefficients with a superconductive sample
The method that is described here uses the current-sharing characteristic of a copper-stabilized, superconductive NbTi wire to determine the temperature. The measurements were made for magnetic fields up to 6 T and the precision actually attained with this method is about 0.1 K. It is an improvement over one that has been used at 4.2 K to measure transient heat transfer in that all the parameters of the sample are well known and the current in the sample is measured directly. The response time of the probe is less than 5 ..mu..s and it has been used to measure temperatures during heat pulses as short as 20 ..mu..s. Temperature measurements between 1.6 and 8.5 K are described. An accurate formula based on the current and electric field along the sample has been developed for temperatures between 2.5 K and the critical temperature of the conductor, which, of course, depends on the applied field. Also described is a graphical method that must be used below 2.5 K, where the critical current is not a linear function of temperature.
- Research Organization:
- Commissariat a l'Energie Atomique, Centre d'Etudes Nucleaires de Saclay, DPh/Pe: S.T.I.P.E.: B.P. No. 2, 91190: GIF-sur-Yvette, France
- OSTI ID:
- 5458838
- Journal Information:
- J. Appl. Phys.; (United States), Vol. 51:5
- Country of Publication:
- United States
- Language:
- English
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
NIOBIUM ALLOYS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TITANIUM ALLOYS
ACCURACY
COPPER
MAGNETIC FIELDS
PROBES
PULSES
STABILIZATION
TEMPERATURE MEASUREMENT
ULTRALOW TEMPERATURE
WIRES
ALLOYS
ELECTRIC CONDUCTIVITY
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ELEMENTS
METALS
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360104* - Metals & Alloys- Physical Properties
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Optical
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