Li, R X*; Gibble, K*; Szymaniec, K (2011) Improved accuracy of the NPL-CsF2 primary frequency standard: evaluation of distributed cavity phase and microwave lensing frequency shifts. Metrologia, 48 (5). pp. 283-289.

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Abstract

We evaluate distributed cavity phase and microwave lensing frequency shifts, which were two largest sources of uncertainty for the NPL-CsF2 cesium fountain clock. We report measurements that confirm a detailed theoretical model of the microwave cavity fields and the frequency shifts of the clock that they produce. The model and measurements give a significantly smaller distributed cavity phase uncertainty of 1.1 ´ 10-16. We derive the microwave lensing frequency shift for a cylindrical cavity with a circular aperture. An analytic result with reasonable approximations is given in addition to a full calculation, which indicates a shift of 6.2 ´ 10-17. The measurements and theoretical models we report, along with improved evaluations of collisional and microwave leakeage induced frequency shifts, reduce the frequency uncertainty of the NPL-CSF2 standard to 2.3 ´ 10-16, nearly a factor of two lower than its most recent complete evaluation.

Item Type:	Article
Subjects:	Time and Frequency Time and Frequency > Microwave Frequency Standards
Identification number/DOI:	10.1088/0026-1394/48/5/007
Last Modified:	02 Feb 2018 13:14
URI:	http://eprintspublications.npl.co.uk/id/eprint/5274

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