NDLI: Realization of a $^{3}$He–$^{4}$He Vapor-Pressure Thermometer for Temperatures Between 0.65 K and 5 K at LNE-CNAM

Content Provider	Springer Nature Link
Author	Sparasci, F. Pitre, L. Truong, D. Risegari, L. Hermier, Y.
Copyright Year	2011
Abstract	In the temperature range between 0.65 K and 5 K, the International Temperature Scale of 1990 (ITS-90) is based on $^{3}$He and $^{4}$He vapor-pressure thermometers. Between 0.65 K and 1 K, the ITS-90 overlaps with the Provisional Low Temperature Scale of 2000 (PLTS-2000), defined in term of the melting pressure of $^{3}$He. Some differences, up to more than 1 mK, exist between the two scales in the overlapping interval. The LNE-CNAM has recently started the construction of a $^{3}$He–$^{4}$He vapor-pressure thermometer to realize the ITS-90 in its lowest subrange at the highest degree of accuracy. The device is provided with two separate vapor-pressure chambers, one for $^{3}$He and the other for $^{4}$He, built in a single copper block, and is installed in the experimental space of a dilution refrigerator. The vapor-pressure thermometer is designed to accommodate on the same copper block several transfer standards, an acoustic thermometer, and the $^{3}$He melting-pressure thermometer. This configuration is intended for realizing calibrations of transfer standards down to 0.65 K, for investigating the possibility to extend the acoustic thermometer below 4 K, and to perform a direct comparison between the ITS-90 and the PLTS-2000 in the overlapping temperature range, in order to study their differences. The realization of the system has been recently accomplished, and this report illustrates the characteristics of such an experimental device.
Starting Page	139
Ending Page	152
Page Count	14
File Format	PDF
ISSN	0195928X
Journal	International Journal of Thermophysics
Volume Number	32
Issue Number	1-2
e-ISSN	15729567
Language	English
Publisher	Springer US
Publisher Date	2011-02-15
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Acoustic thermometry Cryogenics International Temperature Scale of 1990 (ITS-90) Provisional Low Temperature Scale of 2000 (PLTS-2000) Thermodynamic temperature Vapor pressure thermometry Physical Chemistry Industrial Chemistry/Chemical Engineering Mechanics Condensed Matter Physics
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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