Measurement of dynamic end-to-end cavity phase shifts in cesium-fountain frequency standards

摘要

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 Δf/f=10-16 level.