Abstract
A cryogenic thermometer calibration facility has been designed and is being commissioned in preparation for the very stringent requirements on the temperature control of the LHC superconducting magnets. The temperature is traceable in the 1.5 to 30 K range to standards maintained in a national metrological laboratory by using a set of Rhodium-Iron temperature sensors of metrological quality. The calibration facility is designed for calibrating simultaneously 60 industrial cryogenic thermometers in the 1.5 K to 300 K temperature range, a thermometer being a device that includes both a temperature sensor and the wires heat-intercept. The thermometers can be calibrated in good and degraded vacuum or immersed in the surrounding fluid and at different Joule self-heating conditions that match those imposed by signal conditioners used in large cryogenic machinery. The calibration facility can be operated in an automatic mode and all the control and safety routines are handled by a Programmable Logic Controller (PLC). Lab VIEW® is used both as the PLC operator interface and for configuring and reading the thermometric data sampled by the higher accuracy laboratory equipment. The isothermal support onto which the thermometers are mounted is thermally anchored through the wiring to a helium bath. The calibration procedure begins once the temperature of the support is stabilized. Measured data is presented and it is possible to infer that the absolute accuracy that can be obtained is better than ± 5 mK for the full temperature range.
This is a preview of subscription content, log in via an institution.
Buying options
Tax calculation will be finalised at checkout
Purchases are for personal use only
Learn about institutional subscriptionsPreview
Unable to display preview. Download preview PDF.
References
L. R. Evans, The Large Hadron Collider Project, in: “proceedings of CEC 16-ICMC”, Kitakyushu — Japan (1996), p. 45
V. Benda et al., Conceptual design of the cryogenic system for the Large Hadron Collider (LHC), EPAC-96, (1996), P. 361
C. Balle and J. Casas, Industrial-type cryogenic thermometer with built-in heat interception, in: “Advances in Cryogenic Engineering”, Vol. 41 B, Plenum, NY (1996), p. 1715
F. Pavese, V.M. Malyshev, P.P.M. Steur , D. Ferri and D. Giraudi, Routine calibration of cryogenic thermometers in the range 1.5–300K with an accuracy up to the milliKelvin level, and measurement of fixed points in sealed cells with a fully automated and self-contained modular apparatus, in: “Advances in Cryogenic Engineering”, Vol. 41 B, Plenum, NY (1996), p. 1683
V.L. Datskov and J.G. Weisend II, Characteristics of Russian carbon resistance (TVO) cryogenic thermometers, Cryogenics, Vol 34 (1994), p. 425
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1998 Springer Science+Business Media New York
About this chapter
Cite this chapter
Balle, C., Casas, J., Thermeau, J.P. (1998). Cryogenic Thermometer Calibration Facility at CERN. In: Kittel, P. (eds) Advances in Cryogenic Engineering. Advances in Cryogenic Engineering, vol 43. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-9047-4_92
Download citation
DOI: https://doi.org/10.1007/978-1-4757-9047-4_92
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4757-9049-8
Online ISBN: 978-1-4757-9047-4
eBook Packages: Springer Book Archive