Jefferts, S.
, Heavner, T.
, Parker, T.
and Shirley, J.
(2007),
NIST Cesium Fountains – Current Status and Future Prospects, Proceedings of the SPIE: Time and Frequency Metrology, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=50590
(Accessed December 25, 2024)
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NIST Cesium Fountains – Current Status and Future Prospects
Published
Author(s)
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Abstract
We review the current status of the U.S. Primary Frequency Standard, NIST-F1. NIST-F1 is a laser-cooled cesium fountain based frequency standard with an inaccuracy of less than δ f/f {less than or equal to} 5×10-16 limited mainly by the radiation field in the room-temperature fountain (blackbody shift). NIST-F1 is one of the best cesium fountain currently contributing to international atomic time, but has reached a point that it is impractical to improve its accuracy substantially. Therefore we are building a new fountain, imaginatively named NIST-F2, with a cryogenic (77K) Ramsey interrogation zone which lowers the blackbody shift by several orders of magnitude. NIST-F2 is currently undergoing final assembly and we will discuss our planned (hoped for) performance which includes frequency inaccuracy of δ f/f {less than} 1×10^-16^.Citation
Proceedings of the SPIE: Time and Frequency Metrology
Volume
6673
Issue
667309
Pub Type
Journals
Download Paper
Keywords
atomic clock, cesium clock, primary frequency standard
Citation
Issues
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Created September 12, 2007, Updated February 17, 2017