Distributed cavity phase frequency shifts of the caesium fountain PTB-CSF2
نویسندگان
چکیده
منابع مشابه
Uncertainty evaluation of the caesium fountain clock PTB-CSF2
The uncertainty evaluation of CSF2, the second caesium fountain primary frequency standard at PTB, is presented. The fountain uses optical molasses to cool atoms down to 0.6μK. The atoms are launched vertically in a moving optical molasses, and state-selected in the |F = 3,mF = 0〉 hyperfine ground state. During their ballistic flight, the atoms interact twice with a microwave field, thus comple...
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We have measured a previously unobserved systematic frequency shift in our cesium-fountain frequency standard, NIST-F1. This shift, predicted theoretically previously, mimics the well-known end-to-end phase shift in atomic beam standards when synchronous thermal transients are present. Detuning the microwave cavity several megahertz from resonance reduces this effect to the deltaf/f = 1o(-16) l...
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We have observed that the collisional frequency shift in primary caesium fountain clocks varies with the clock state population composition and, in particular, is zero for a given fraction of the |F=4,mF=0) atoms, depending on the initial cloud parameters. We present a theoretical model explaining our observations. The possibility of the collisional shift cancellation implies an improvement in ...
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We present a theoretical analysis of the density dependent frequency shift in Cs fountain clocks using the highly constrained binary collision model described by Leo et al. [Phys. Rev. Lett. 85, 2721 (2000)]. We predict a reversal in the clock shift at temperatures near 0.08 microK. Our results show that s waves dominate the collision process. However, as a consequence of the large scattering l...
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We present measurements of cavity frequency pulling and collisional frequency shifts in a 87Rb fountain with a frequency resolution of 3x10(-16). Agreement with theory is found for the cavity pulling and the measured collisional shifts. The clock shift is found at least 50 times smaller than in 133Cs.
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ژورنال
عنوان ژورنال: Metrologia
سال: 2011
ISSN: 0026-1394,1681-7575
DOI: 10.1088/0026-1394/49/1/012