Title :
Design Details of FOCS-2, an Improved Continuous Cesium Fountain Frequency Standard
Author :
Fiizesi, F. ; Plimmer, Mark D. ; Dudle, Gregor ; Guena, J. ; Thomann, Pierre
Author_Institution :
SGFC S.A., Gingins
fDate :
May 29 2007-June 1 2007
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 < 4 x 10-14 T -1/2 and a relative frequency uncertainty of < 1 x 10-5.
Keywords :
atomic clocks; frequency standards; 2D optical lattice collimation; FOCS-2; atomic beam collimation; continuous Cesium fountain microwave frequency standard; electrostatic motor; relative frequency uncertainty; slow-atom presource; velocity-selective light traps; Atom optics; Clocks; Cooling; Frequency; Local oscillators; Optical pulses; Optical resonators; Stability; Temperature; Uncertainty;
Conference_Titel :
Frequency Control Symposium, 2007 Joint with the 21st European Frequency and Time Forum. IEEE International
Conference_Location :
Geneva
Print_ISBN :
978-1-4244-0646-3
Electronic_ISBN :
1075-6787
DOI :
10.1109/FREQ.2007.4319038