Cryogenic fountain development at NIST and INRIM: preliminary characterization

This paper describes the new twin laser-cooled Cs fountain primary frequency standards NIST-F2 and ITCsF2, and presents some of their design features. Most significant is a cryogenic microwave interrogation region which dramatically reduces the blackbody radiation shift. We also present a preliminar...

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Published inIEEE transactions on ultrasonics, ferroelectrics, and frequency control Vol. 57; no. 3; pp. 600 - 605
Main Authors Levi, F., Calosso, C., Calonico, D., Lorini, L., Bertacco, E.K., Godone, A., Costanzo, G.A., Mongino, B., Jefferts, S.R., Heavner, T.P., Donley, E.A.
Format Journal Article Conference Proceeding
LanguageEnglish
Published New York, NY IEEE 01.03.2010
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Blackbody
Cryogenics
Electromagnetic heating
Exact sciences and technology
Ferroelectric materials
Frequency
Frequency control
Frequency standards
Interrogation
Laboratories
Measurements common to several branches of physics and astronomy
Metrology, measurements and laboratory procedures
Microwaves
NIST
Nitrogen
Physics
Temperature dependence
Testing
Time and frequency
Uncertainty
Atomic standard
Microwave radiation
Cryogenics
Cesium
Frequency measurement
Cryogenic temperature
Atomic clocks
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Summary:This paper describes the new twin laser-cooled Cs fountain primary frequency standards NIST-F2 and ITCsF2, and presents some of their design features. Most significant is a cryogenic microwave interrogation region which dramatically reduces the blackbody radiation shift. We also present a preliminary accuracy evaluation of IT-CsF2.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0885-3010
1525-8955
DOI:10.1109/TUFFC.2010.1453