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2007 | 112 | 5 | 759-767
Article title

NIST Cesium Fountains - Current Status and Future Prospects

Content
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Languages of publication
EN
Abstracts
EN
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 thanδ f/f<5×10^{-16}; limited mainly by the radiation field in the room-temperature fountain (blackbody shift). NIST-F1 is one of the best cesium fountains 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 (77 K) Ramsey interrogation zone that 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 ofδ f/f<1×10^{-16}.
Keywords
Year
Volume
112
Issue
5
Pages
759-767
Physical description
Dates
published
2007-11
received
2007-09-03
References
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Document Type
Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv112n506kz
Identifiers
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