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First performance results of PTB's atomic caesium fountain and a study of contributions to its frequency instability

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5 Author(s)
Weyers, S. ; Phys. Tech. Bundesanstalt, Braunschweig, Germany ; Bauch, A. ; Hubner, U. ; Schroder, R.
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At the Physikalisch-Technische Bundesanstalt (PTB), an atomic caesium fountain was constructed. Ramsey fringes with a full width at half maximum (FWHM) of 0.86 Hz were obtained by launching the atoms to a height of 83 cm above the cooling region (40 cm above the microwave cavity center). A first measurement of the homogeneity of the magnetic flux density yields 0.33 nT (rms), only 0.16% of the mean value of 0.205 /spl mu/T used in normal operation. The inherent elementary noise contributions of the fountain and of a thermal beam atomic clock are compared in some detail.

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Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on  (Volume:47 ,  Issue: 2 )