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Proceedings Paper

Comparisons between 3 fountain clocks at LNE-SYRTE
Author(s): F. Chapelet; J. Guéna; D. Rovera; P. Laurent; P. Rosenbusch; G. Santarelli; S. Bize; A. Clairon; M. E. Tobar; M. Abgrall
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Paper Abstract

Comparisons between three Cs fountains are described. All three LNE-SYRTE fountain clocks are now using a cryogenic sapphire oscillator as a starting point to generate the microwave probe signal. As a result, all three fountains have a fractional frequency instability in the 10-14 range at 1 s. All three fountains are also using a recently developed generation of microwave synthesizers allowing to switch the microwave probe signal without introducing detrimental phase transient. Several series of measurements have been made totalizing more than 80 days of simultaneous operation under optimized conditions of a pair of either fountains. Results of these measurements are presented. Finally, modifications of the FO2 fountain has been completed to allow simultaneous operation with Rb and Cs. Operation with Rb leads to a fractional frequency instability of 6.3 × 10-14τ-1/2.

Paper Details

Date Published: 12 September 2007
PDF: 14 pages
Proc. SPIE 6673, Time and Frequency Metrology, 66730B (12 September 2007); doi: 10.1117/12.734125
Show Author Affiliations
F. Chapelet, LNE-SYRTE, Observatoire de Paris (France)
J. Guéna, LNE-SYRTE, Observatoire de Paris (France)
D. Rovera, LNE-SYRTE, Observatoire de Paris (France)
P. Laurent, LNE-SYRTE, Observatoire de Paris (France)
P. Rosenbusch, LNE-SYRTE, Observatoire de Paris (France)
G. Santarelli, LNE-SYRTE, Observatoire de Paris (France)
S. Bize, LNE-SYRTE, Observatoire de Paris (France)
A. Clairon, LNE-SYRTE, Observatoire de Paris (France)
M. E. Tobar, Univ. of Western Australia (Australia)
M. Abgrall, CNES (France)


Published in SPIE Proceedings Vol. 6673:
Time and Frequency Metrology
R. Jason Jones, Editor(s)

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