title: Measurement of dynamic end-to-end cavity phase shifts in cesium-fountain frequency standards.
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 deltaf/f = 1o(-16) level.
authors.forename: S R
authors.initials: SR
authors.lastname: Jefferts
authors.forename: T P
authors.initials: TP
authors.lastname: Heavner
authors.forename: E A
authors.initials: EA
authors.lastname: Donley
authors.forename: T E
authors.initials: TE
authors.lastname: Parker