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Proceedings Paper

NIST cesium fountains: current status and future prospects
Author(s): S. R. Jefferts; T. P. Heavner; T. E. Parker; J. H. Shirley
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Paper 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 ≤ 5x10-16 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 of δ f / f < 1x10-16

Paper Details

Date Published: 12 September 2007
PDF: 9 pages
Proc. SPIE 6673, Time and Frequency Metrology, 667309 (12 September 2007); doi: 10.1117/12.734965
Show Author Affiliations
S. R. Jefferts, National Institute of Standards and Technology (United States)
T. P. Heavner, National Institute of Standards and Technology (United States)
T. E. Parker, National Institute of Standards and Technology (United States)
J. H. Shirley, National Institute of Standards and Technology (United States)


Published in SPIE Proceedings Vol. 6673:
Time and Frequency Metrology
R. Jason Jones, Editor(s)

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