K Szymaniec et al 2005 Metrologia 42 49 doi:10.1088/0026-1394/42/1/007
K Szymaniec, W Chalupczak, P B Whibberley, S N Lea and D Henderson
Show affiliationsA 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 σy(τ) = 1.4 × 10−13τ−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.
Issue 1 (February 2005)
Received 29 September 2004
Published 9 February 2005
K Szymaniec et al 2005 Metrologia 42 49
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