Recent improvements of Bureau National de Metrologie Systemes de Reference Temps Espace (BNM-SYRTE) fountains FO1 and FO2 are described. Fractional frequency instabilities of 2.9 X 10(-14)τ(-1/2) for FO1 and 1.6 x 10(-14)τ(-1/2) for FO2 have been demonstrated. A preliminary estimate of the systematic frequency shifts gives an uncertainty of +/- 7.2 x 10(-16) for FO1 and +/- 6.5 x 10(-16) for FO2. Furthermore, we present a direct comparison between the two fountains. When a real-time measurement of the collisional shift is included, we observe a stability of the comparison of 5.0 x 10(-14)τ(-1/2) and a frequency difference of δ = 4 x 10(-16), well within the combined uncertainties.
|Journal||IEEE Transactions on Instrumentation and Measurement|
|Publication status||Published - 2005|
Vian, C., Rosenbusch, P., Marion, H., Bize, S., Cacciapuoti, L., Zhang, S., Abgrall, M., Chambon, D., Maksimovic, I., Laurent, P., Santarelli, G., Clairon, A., Luiten, A., Tobar, M., & Salomon, C. (2005). BNM-SYRTE fountains : recent results. IEEE Transactions on Instrumentation and Measurement, 54(2), 833-836. https://doi.org/10.1109/TIM.2005.843573