Fountain clock accuracy

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

6 Scopus citations


We give a review of recent advances in the accuracy of atomic fountain clocks. The new features are improved experimental and theoretical treatments of distributed cavity phase shifts and a full modeling of microwave lensing. Here we highlight that state selection is often highly non-uniform when Rabi flopping is used instead of an interrupted adiabatic frequency chirp. We show that detuning the state-selection microwave field as well as changing its amplitude can give a much more homogeneous state selection. A spatially inhomogeneous state selection corrupts the density extrapolation because the density distribution changes, which also mixes effects from distributed cavity phase and microwave lensing. This is expected to be important for the microgravity clock PHARAO on ACES, and can also improve fountain clocks.

Original languageEnglish (US)
Title of host publicationEFTF 2012 - 2012 European Frequency and Time Forum, Proceedings
Number of pages3
StatePublished - 2012
Event2012 European Frequency and Time Forum, EFTF 2012 - Gothenburg, Sweden
Duration: Apr 23 2012Apr 27 2012

Publication series

NameEFTF 2012 - 2012 European Frequency and Time Forum, Proceedings


Other2012 European Frequency and Time Forum, EFTF 2012

All Science Journal Classification (ASJC) codes

  • Acoustics and Ultrasonics


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