Measurement of the magnetic field profile in the atomic fountain clock FoCS-2 using Zeeman spectroscopy

TL;DR

This paper presents a novel method using time-resolved Zeeman spectroscopy to measure the magnetic field profile in the continuous atomic fountain clock FoCS-2, achieving high precision in evaluating the second order Zeeman shift.

Contribution

It introduces a new approach for magnetic field profiling in continuous atomic fountain clocks, overcoming limitations of methods used in pulsed fountains.

Findings

Zeeman shift evaluated with <10^-16 relative uncertainty

Spatial resolution of magnetic field profile achieved

Method applicable to continuous fountain clock operation

Abstract

We report the evaluation of the second order Zeeman shift in the continuous atomic fountain clock FoCS-2. Because of the continuous operation and of its geometrical constraints, the methods used in pulsed fountains are not applicable. We use here time-resolved Zeeman spectroscopy to probe the magnetic field profile in the clock. The pulses of ac magnetic excitation allow us to spatially resolve the Zeeman frequency and to evaluate the Zeeman shift with a relative uncertainty smaller than 10E-16.