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Status and prospect of the Swiss continuous Cs fountain FoCS-2

Auteur(s)
Jallageas, Antoine 
Institut de physique 
Devenoges, Laurent 
Institut de physique 
Petersen, Michael
Morel, Jacques
Bernier, Laurent-Guy
Thomann, Pierre 
Institut de physique 
Südmeyer, Thomas 
Institut de physique 
Date de parution
2016
In
Journal of Physics: Conference Series, IOP
Vol.
723
No
1
De la page
1201
Résumé
The continuous cesium fountain clock FoCS-2 at METAS presents many unique characteristics and challenges in comparison with standard pulsed fountain clocks. For several years FoCS-2 was limited by an unexplained frequency sensitivity on the velocity of the atoms, in the range of 140 · 10<sup>-15</sup>. Recent experiments allowed us to identify the origin of this problem as undesirable microwave surface currents circulating on the shield of the coaxial cables that feed the microwave cavity. A strong reduction of this effect was obtained by adding microwave absorbing coatings on the coaxial cables and absorbers inside of the vacuum chamber. This breakthrough opens the door to a true metrological validation of the fountain. A series of simulation tools have already been developed and proved their efficiency in the evaluation of some of the uncertainties of the continuous fountain. With these recent improvements, we are confident in the future demonstration of an uncertainty budget at the 10<sup>-15</sup> level and below.
Identifiants
https://libra.unine.ch/handle/123456789/4873
_
10.1088/1742-6596/723/1/012010
Type de publication
journal article
Dossier(s) à télécharger
 main article: Jallageas_A.-Status_and_prospect-20170410.pdf (3.38 MB)
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