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

Volume

48

Issue

3

fYear

2001

fDate

5/1/2001 12:00:00 AM

Firstpage

847

Lastpage

850

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;

fLanguage

English

Journal_Title

Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on

Publisher

ieee

ISSN

0885-3010

Type

jour

DOI

10.1109/58.920721

Filename

920721