Title :
Measurement of dynamic end-to-end cavity phase shifts in cesium-fountain frequency standards
Author :
Jefferts, S.R. ; Heavner, T.P. ; Donley, E.A. ; Parker, T.E.
Author_Institution :
Time & Frequency Div., Nat. Inst. of Stand. & Technol., Boulder, CO, USA
fDate :
6/1/2004 12:00:00 AM
Abstract :
We have measured a previously unobserved systematic frequency shift in our cesium-fountain frequency standard, NIST-F1. This shift, predicted theoretically previously, mimics the well-known end-to-end phase shift in atomic beam standards when synchronous thermal transients are present. Detuning the microwave cavity several megahertz from resonance reduces this effect to the /spl delta/f/f=10/sup -16/ level.
Keywords :
caesium; cavity resonators; frequency standards; microwave measurement; Ce; atomic beam standards; cesium-fountain frequency standards; detuning; end-end cavity phase shifts; microwave cavity; thermal transients; Clocks; Control systems; Copper; Electromagnetic heating; Fluctuations; Frequency measurement; Measurement standards; Phase measurement; Temperature control; Temperature sensors;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
DOI :
10.1109/TUFFC.2004.1320844
