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We have demonstrated the possibility for a compact frequency standard basedon a sample of cold cesium atoms. In a cylindrical microwave cavity, the atomsare cooled and interrogated during a free expansion and then detected. Theoperation of this experiment is different from conventional atomic fountains,since all the steps are sequentially performed in the same position of space.In this paper we report the analysis of a Ramsey pattern observed to present a47 Hz linewidth and a stability of 5x10^-13 for an integration time longer than100s. Some of the main limitations of the standard are analyzed. This presentreport demonstrates considerable improvement of our previous work (S. T. Mulleret al, J. Opt. Soc. Am. B, v.25, p.909, 2008) where the atoms were in a freespace and not inside a microwave cavity.

Compact Frequency Standard Based on an Intra-cavity Sample Cold Cesium Atoms