First accuracy evaluation of the NRC-FCs2 primary frequency standard

Scott Beattie, Bin Jian, John Alcock, Marina Gertsvolf, Rich Hendricks, Krzysztof Szymaniec, Kurt Gibble

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


We report the first accuracy evaluation of NRC-FCs2, an atomic fountain clock developed at the National Research Council Canada. The short term stability at high atomic density is 1.1 10-13 at 1 second of averaging time. The typical overall fractional type B uncertainty is 2.3 10-16. GNSS-based frequency comparisons of NRC-FCs2 with the SI second, as reported by the BIPM over fourteen months, give a fractional frequency difference of -2.4(3.7) 10-16

Original languageEnglish (US)
Article number035010
Issue number3
StatePublished - Jun 2020

All Science Journal Classification (ASJC) codes

  • General Engineering


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