# Design Details of FOCS-2, an Improved Continuous Cesium Fountain Frequency Standard

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1 METAS - Swiss Federal Office of Metrology 2 SYRTE - Systèmes de Référence Temps Espace 3 LTF-IMT - Laboratoire Temps Fréquence

Abstract : We report on the design, construction and current status of FOCS-2, the second continuous fountain microwave cesium frequency standard after FOCS-1. Both incorporate velocity-selective light traps driven by an electrostatic motor. FOCS-2 will take fuller advantage of the continuous fountain approach to gain in shot-noise-limited stability without loss of accuracy via the use of a higher flux. This is obtained via the implementation of a novel slow-atom pre-source and better collimation of the atomic beam. A detailed description of the apparatus is provided and compared with FOCS-1 to highlight improvements. In addition, we present results from related experiments on collimation in a 2D optical lattice. The goals for this new standard are a short-term stability of < 4x10-14 $\tau$-1-2 and a relative frequency uncertainty of < 1 x 10-15.

Keywords : Continuous Atomic Fountain Frequency Standard

Autor: Ferenc Füzesi - Mark Plimmer - Gregor Dudle - Jocelyne Guéna - Pierre Thomann -

Fuente: https://hal.archives-ouvertes.fr/

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