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We report on measurements to characterize phase gradients inside the Cs microwave cavity in the SYRTE double fountain FO2. The clock frequency is measured as a function of the tilt of launch velocity with respect to gravity, as a function of the microwave power and when feeding the Ramsey cavity from either sides or symmetrically using the two microwave feedthroughs. These measurements are made with...
We report on a new experiment that tests for a violation of Lorentz invariance (LI), by searching for a dependence of atomic transition frequencies on the orientation of the spin of the involved states (Hughes-Drever type experiment). The atomic frequencies are measured using a laser cooled 133Cs atomic fountain clock, operating on a particular combination of Zeeman substates. We analyze the results...
Over the last few years the number of high accuracy (uncertainties in the low 10−15 or less) primary frequency standards contributing to TAI has increased significantly from only two over the period 2000 – 2002 to seven over the period 2002 – 2005. As a consequence the number of individual measurements of TAI frequency by such standards over the period 1999 to 2005 is > 60 and increasing rapidly...
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