NDLI: Uncertainty evaluation of the continuous cesium fountain frequency standard FOCS-2

Content Provider	IEEE Xplore Digital Library
Author	Di Domenico, G. Devenoges, L. Joyet, A. Stefanov, A. Thomann, P.
Copyright Year	2011
Description	Author affiliation: Laboratoire Temps-Fréquence, Université de Neuchâtel, 2000 Neuchâtel, Switzerland (Di Domenico, G.; Devenoges, L.; Joyet, A.; Thomann, P.) \|\| Federal Office of Metrology, 3003 Bern-Wabern, Switzerland (Stefanov, A.)
Abstract	The continuous atomic fountain primary frequency standard FOCS-2 is quite unique since all the atomic fountain clocks presently contributing to the international atomic time (TAI) are operating in pulsed mode [1]. Our alternative approach offers the possibility to operate with a high atomic flux without the collisional shift limiting the accuracy or the Dick effect limiting the stability when a quartz is used as local oscillator [2], [3]. Moreover, it contributes to the metrological diversity since the relative importance of the error budget contributors is different in the two types of fountains, notably for microwave cavity and density related effects. In this contribution we present the status of the metrological evaluation of the continuous fountain FOCS-2. Thanks to an innovative atomic beam source followed by an atomic state preparation stage, we reach a signal-to-noise ratio of 600√Hz and thus a relative frequency instability of 6 × $10^{−14}$ $T^{−1/2}.$ A detailed investigation of the frequency shifts which are specific to the continuous operation (light-shift from the source and cavity end-to-end phase shift) shows that the continuous fountain is compatible with an inaccuracy at the $10^{−15}$ level or below.
Starting Page	1
Ending Page	5
File Size	925205
Page Count	5
File Format	PDF
ISBN	9781612841113
ISSN	10756787
e-ISBN	9781612841120
DOI	10.1109/FCS.2011.5977825
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-05-02
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Atomic beams Atomic measurements Cavity resonators Atomic clocks Microwave measurements Frequency measurement Microwave theory and techniques
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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