Cryogenic fountain development at NIST and INRIM: preliminary characterization

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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Veröffentlicht in:IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 2010-03, Vol.57 (3), p.600-605
Hauptverfasser: 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: Artikel
Sprache:eng
Schlagworte:
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
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Zusammenfassung: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.
ISSN:0885-3010
1525-8955
DOI:10.1109/TUFFC.2010.1453