First accuracy evaluation of the NRC-FCs2 primary frequency standard
Scott Beattie, Bin Jian, John Alcock, Marina Gertsvolf, Richard Hendricks, K. Szymaniec, Kurt Gibble
Abstract
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.
Topics & Concepts
Atomic clockFountainFrequency standardResearch councilStability (learning theory)Term (time)StatisticsMathematicsEnvironmental sciencePhysicsGeodesyComputer scienceOpticsGeologyGeographyQuantum mechanicsGovernment (linguistics)PhilosophyArchaeologyLinguisticsMachine learningAdvanced Frequency and Time StandardsScientific Measurement and Uncertainty EvaluationCardiovascular Syncope and Autonomic Disorders