Accuracy evaluation of a cesium fountain primary frequency standard at NIST

Author

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

Author_Institution

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

fYear

2000

fDate

14-19 May 2000

Firstpage

311

Lastpage

312

Abstract

Since November of 1998, we have performed five frequency uncertainty evaluations on NIST F-1, our laser-cooled cesium fountain. The results from the latest evaluation have a statistical uncertainty of 1.4/spl times/10/sup -15/ and an uncorrected bias of 0.7/spl times/10/sup -15/. The results have been reported to the BIPM for inclusion in TAI, making this clock one of two cesium fountain clocks used as primary standards in the world. We will present an overview of the evaluations and their uncertainties.

Keywords

atomic clocks; cesium; frequency stability; frequency standards; laser cooling; measurement uncertainty; radiation pressure; Cs; NIST F-1 laser-cooled cesium fountain; Ramsay microwave cavity; TAI time; accuracy evaluation; atomic fountain primary frequency standard; blackbody radiation shift; cesium fountain clocks; frequency uncertainty evaluation; gravitational redshift; optical molasses; second-order Zeeman shift; spin exchange; statistical uncertainty; uncorrected bias; Acceleration; Atom lasers; Atom optics; Atomic beams; Clocks; Frequency; Laser beams; NIST; Optical attenuators; Uncertainty;

fLanguage

English

Publisher

ieee

Conference_Titel

Precision Electromagnetic Measurements Digest, 2000 Conference on

Conference_Location

Sydney, NSW, Australia

Print_ISBN

0-7803-5744-2

Type

conf

DOI

10.1109/CPEM.2000.851001

Filename

851001