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Proceedings Article

NIST cesium fountains: current status and future prospects

[+] Author Affiliations
S. R. Jefferts, T. P. Heavner, T. E. Parker, J. H. Shirley

National Institute of Standards and Technology

Proc. SPIE 6673, Time and Frequency Metrology, 667309 (September 12, 2007); doi:10.1117/12.734965
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From Conference Volume 6673

  • Time and Frequency Metrology
  • R. Jason Jones
  • San Diego, CA | August 26, 2007

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

© (2007) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

S. R. Jefferts ; T. P. Heavner ; T. E. Parker and J. H. Shirley
"NIST cesium fountains: current status and future prospects", Proc. SPIE 6673, Time and Frequency Metrology, 667309 (September 12, 2007); doi:10.1117/12.734965; http://dx.doi.org/10.1117/12.734965


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