Evaluation of the primary frequency standard NPL-CsF1

A new caesium fountain frequency standard (NPL-CsF1) at the National Physical Laboratory is described. Procedures for evaluation of the systematic frequency shifts are presented. The NPL-CsF1 has a short-term stability sy(t) = 1.4 X 10-13t-1/2, predominantly due to the local oscillator phase noise....

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Bibliographic Details
Published in:Metrologia 2005-02, Vol.42 (1), p.49-57
Main Authors: Szymaniec, K, Chalupczak, W, Whibberley, P B, Lea, S N, Henderson, D
Format: Article
Language:English
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Summary:A new caesium fountain frequency standard (NPL-CsF1) at the National Physical Laboratory is described. Procedures for evaluation of the systematic frequency shifts are presented. The NPL-CsF1 has a short-term stability sy(t) = 1.4 X 10-13t-1/2, predominantly due to the local oscillator phase noise. The accuracy of 1 part in 1015 is limited by the uncertainty of the frequency shift due to collisions between cold atoms.
ISSN:0026-1394
1681-7575
DOI:10.1088/0026-1394/42/1/007