Heavner, T.
, Jefferts, S.
, Donley, E.
, Levi, F.
and Parker, T.
(2005),
A New Microwave Synthesis Chain for the Primary Frequency Standard NIST-F1, Proc. Joint Mtg. IEEE Intl. Freq. Cont. Symp. and PTTI Mtg., [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=50220
(Accessed October 9, 2025)
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A New Microwave Synthesis Chain for the Primary Frequency Standard NIST-F1
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Abstract
We present the design and measurements of the microwave synthesis chain presently used in NIST-F1, the laser-cooled cesium fountain primary frequency standard in operation at NIST, Boulder, CO. This system has been used in two accuracy evaluations of NIST-F1 (January 2005 and July 2005) which each had a combined (Type A and Type B) fractional frequency uncertainty of 0.5 10-15. Additionally, this synthesis chain was in use during a recent calibration of the 199Hg+ optical clock transition against Cs which had a fractional uncertainty of 9.1 10-16.Proceedings Title
Proc. Joint Mtg. IEEE Intl. Freq. Cont. Symp. and PTTI Mtg.
Pub Type
Conferences
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Keywords
CES, GEN, SYN, TIME
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Created August 29, 2005, Updated February 17, 2017