Speaker
Mr
Fabien Droz
(Orolia Switzerland SA (Spectratime))
Description
In order to improve the robustness of the existing GALILEO FOC design, the occurrence and the amplitude of frequency anomalies were strongly reduced. The strategy was to reduce the influence of the identified causes through their intrinsic coefficients. Mainly the light shift and the power shift coefficients are concerned.
The critical coefficients were reduced by significant factors:
- light shift coefficient: reduction factor of 10,
- power shift coefficient: reduction factor of 5.
In addition to that, the atomic line bandwidth was reduced from 1.2KHz to 300Hz leading to a better clock frequency stability both in short and long term. Performances achievements during uninterrupted operation of several months demonstrate a monotonic behavior, a typical stability of 1x10-14 @105 sec.
It must be noted that the new design do not introduced new processes in order to benefit of the previous qualification heritage.
Primary author
Mr
Fabien Droz
(Orolia Switzerland SA (Spectratime))
Co-authors
Mr
Batiste Scheidegger
(Orolia Switzerland SA (Spectratime))
Mr
Pascal Rochat
(Orolia Switzerland SA (Spectratime))
Mr
Sébastien Boillat
(Orolia Switzerland SA (Spectratime))
