Distributed cavity phase frequency shifts of the caesium fountain PTB-CSF2

S. Weyers, V. Gerginov, N. Nemitz, R. Li, K. Gibble

Research output: Contribution to journalArticlepeer-review

80 Scopus citations


We evaluate the frequency error from distributed cavity phase in the caesium fountain clock PTB-CSF2 at the Physikalisch-Technische Bundesanstalt with a combination of frequency measurements and ab initio calculations. The associated uncertainty is 1.3 × 10 -16, with a frequency bias of 0.4 × 10 -16. The agreement between the measurements and calculations explains the previously observed frequency shifts at elevated microwave amplitude. We also evaluate the frequency bias and uncertainty due to the microwave lensing of the atomic wave packets. We report a total PTB-CSF2 systematic uncertainty of 4.1 × 10 -16.

Original languageEnglish (US)
Pages (from-to)82-87
Number of pages6
Issue number1
StatePublished - Feb 2012

All Science Journal Classification (ASJC) codes

  • General Engineering


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