A new microwave synthesis chain for the primary frequency standard NIST-F1
- 18 January 2006
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- No. 23271914,p. 308-311
- https://doi.org/10.1109/freq.2005.1573950
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. The chain has been used in two accuracy evaluations of NIST-F1 (January 2005 and July 2005), each of which had a combined (type A and type B) fractional frequency uncertainty of ~ 0.5 times 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 times 10-16Keywords
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