Accuracy results from NIST-F1 laser-cooled cesium primary frequency standard

Author

Jefferts, S.R. ; Meekhof, D.M. ; Shirley, J. J H ; Stepanovic, M. ; Parker, T.E.

Author_Institution

Time & Frequency Div., Nat. Inst. of Stand. & Technol., Boulder, CO, USA

fYear

2000

fDate

2000

Firstpage

714

Lastpage

717

Abstract

Since November 1998, we have performed six frequency evaluations of NIST-F1. The results from the last two of these evaluations have been reported to the BIPM for inclusion in TAI. This fountain is presently one of two cesium fountains in the world used in the generation of TAI. This paper presents an overview of the evaluation process and a brief description of the four systematic biases for which the fountain is corrected: blackbody frequency shift, gravitational redshift, second-order Zeeman shift and spin-exchange shift. A large list of other possible shifts which have been studied and found to be negligible are discussed in less detail

Keywords

Zeeman effect; atomic clocks; blackbody radiation; caesium; frequency stability; frequency standards; gravitational red shift; laser cooling; measurement errors; measurement uncertainty; radiation pressure; Cs; NIST-F1 primary frequency standard; TAI generation; blackbody frequency shift; error budget; frequency stability; gravitational redshift; laser-cooled cesium fountain; optical molasses; second-order Zeeman shift; spin-exchange shift; systematic biases; uncertainties; Atom optics; Atomic measurements; Charge carrier processes; Frequency; Magnetic field measurement; Magnetic shielding; Optical pumping; Synthesizers; Temperature control; Uncertainty;

fLanguage

English

Publisher

ieee

Conference_Titel

Frequency Control Symposium and Exhibition, 2000. Proceedings of the 2000 IEEE/EIA International

Conference_Location

Kansas City, MO

ISSN

1075-6787

Print_ISBN

0-7803-5838-4

Type

conf

DOI

10.1109/FREQ.2000.887443

Filename

887443