Title :
Reduction of the cold collisions frequency shift in a multiple velocity fountain: a new proposal
Author :
Levi, Filippo ; Godone, Aldo ; Lorini, Luca
Author_Institution :
Ist. Elettrotecnico Nazionale Galileo Ferraris, Torino, Italy
fDate :
5/1/2001 12:00:00 AM
Abstract :
In this paper, we propose a new scheme for operating an atomic fountain frequency standard. A sequence of time-spaced balls of atoms, launched over nonoverlapping trajectories, makes possible a reduction of the atomic density and consequently the cold collision frequency shift by one order of magnitude without significant reduction of the useful signal and of the overall stability of the clock. The ultimate accuracy of a Cs fountain could be improved below the 10/sup -15/ level currently achieved in operating clocks.
Keywords :
atomic beams; atomic clocks; caesium; frequency stability; frequency standards; laser cooling; radiation pressure; Cs; Ramsay fringes; Zeeman shift; atomic density reduction; atomic fountain frequency standard; cold collision frequency shift reduction; multiple velocity fountain; nonoverlapping trajectories; optical molasses; overall stability; time-spaced balls of atoms; Atomic clocks; Atomic measurements; Clouds; Doppler shift; Frequency; NIST; Proposals; Signal to noise ratio; Stability; Uncertainty;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
