Recent improvements and current uncertainty budget of PTB fountain clock CSF2

V. Gerginov, N. Nemitz, D. Griebsch, M. Kazda, R. Li, Kurt Gibble, R. Wynands, S. Weyers

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations

Abstract

A new source of slow atoms was recently installed on the caesium fountain CSF2 at PTB. This source allows the short-term instability σ y(1s) of CSF2 to be reduced from 2.5×10-13 to 1.7×10-13. Because of the reduced atom loading time and the higher number of atoms, the collisional shift uncertainty is no longer the largest term in the uncertainty budget. The uncertainty is now dominated by the uncertainty contribution due to the observed microwave power dependence of the output frequency. Measurements with the CSF1 fountain suggest that the longitudinal cavity phase gradients produce the observed frequency shifts at elevated power. For normal operation related shifts in CSF1 are expected to be much less than 1×10-16. Due to the larger cloud size associated with the optical molasses used for cooling in CSF2, the effects of longitudinal phase gradients will be even further suppressed in CSF2.

Original languageEnglish (US)
Title of host publicationEFTF 2010 - 24th European Frequency and Time Forum
DOIs
Publication statusPublished - Dec 1 2010
Event24th European Frequency and Time Forum, EFTF 2010 - Noordwijk, Netherlands
Duration: Apr 13 2010Apr 16 2010

Publication series

NameEFTF 2010 - 24th European Frequency and Time Forum

Other

Other24th European Frequency and Time Forum, EFTF 2010
CountryNetherlands
CityNoordwijk
Period4/13/104/16/10

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All Science Journal Classification (ASJC) codes

  • Acoustics and Ultrasonics

Cite this

Gerginov, V., Nemitz, N., Griebsch, D., Kazda, M., Li, R., Gibble, K., ... Weyers, S. (2010). Recent improvements and current uncertainty budget of PTB fountain clock CSF2. In EFTF 2010 - 24th European Frequency and Time Forum [6533639] (EFTF 2010 - 24th European Frequency and Time Forum). https://doi.org/10.1109/EFTF.2010.6533639