Performance of PTB´s caesiurn fountain CSF 1

Author

Weyers, S. ; Schröder, R. ; Bauch, A.

Author_Institution

Phys. Tech. Bundesanstalt, Braunschweig, Germany

fYear

2001

fDate

6/23/1905 12:00:00 AM

Firstpage

46

Lastpage

52

Abstract

CSF1, a caesium atomic fountain frequency standard, has been developed and operated since the end of 1999 at the PTB. In an ongoing process, its uncertainty u_B has been evaluated and varies between 1·10^-15 and 2·10^-15, depending on the mode of operation and the duration of the evaluation. Local comparisons with PTB´s conventional primary clocks, CS1 and CS2, and with NIST-F1 using GPS carrier phase and TWSTFT, revealed agreement within the respective uncertainties u_B and the comparison uncertainty. Five measurements of the TAI scale interval with CSF1 have been performed, each lasting 15 days. Use of CSF1 for the realisation of. a free atomic time scale TAF(PTB) is discussed

Keywords

atomic clocks; caesium; frequency standards; laser cooling; measurement uncertainty; CSF1 frequency standard; Cs; GPS carrier phase; International Atomic Time; PTB standard; SI unit; TAI scale interval; TWSTFT; caesium atomic fountain; cold atom collisions; free atomic time scale; frequency comparisons; laser-cooling; local comparisons; microwave cavity; primary frequency standard; uncertainty; Atom lasers; Atomic beams; Atomic measurements; Clocks; Frequency; Laser beams; Performance evaluation; Stationary state; Titanium; Uncertainty;

fLanguage

English

Publisher

ieee

Conference_Titel

Frequency Control Symposium and PDA Exhibition, 2001. Proceedings of the 2001 IEEE International

Conference_Location

Seattle, WA

ISSN

1075-6787

Print_ISBN

0-7803-7028-7

Type

conf

DOI

10.1109/FREQ.2001.956158

Filename

956158