Microwave-Vacuum Integrated Cavity with a Low Temperature Sensitivity for Cs Fountain Clocks

Zheng, Fasong; Fang, Fang; Chen, Wei‐Liang; Liu, Kun; Dai, Shaoyang; Cao, Shiying; Li, Tianchu

doi:10.1109/eftf/ifcs52194.2021.9604254

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“…nearly continuous operation [9]. For these reasons, fountain clocks continue to be developed in many labs around the world for use as primary or secondary frequency standards [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Characterization of the collisional frequency shift in an atomic fountain clock using absorption imaging

Beattie

Jian

2023

Metrologia

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The collisional frequency shift is a dominant contribution to the uncertainty of many caesium fountain clocks. Minimizing the effect can be difficult, as lowering the atomic density comes at the cost of a reduced signal-to-noise ratio. Also, it is typically not atomic density, but total atom number that is measured in the experiment, which can lead to a potential measurement bias. In this paper, we describe a direct measurement of the atomic density using absorption imaging of the atomic cloud. For the caesium fountain clock, NRC-FCs2, at the National Research Council Canada, these measurements have led to a reduction in the uncertainty due to the collisional shift by a factor of 10.

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Section: Introductionmentioning

confidence: 99%