Mainz 2017 – scientific programme

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A: Fachverband Atomphysik

A 26: Poster Session II

A 26.45: Poster

Wednesday, March 8, 2017, 17:00–19:00, P OG1

Comparison of three modes of operation for an optical magnetometer for exotic physics searches. — •Hector Masia-Roig, Arne Wickenbrock, and Dmitry Budker — Helmholtz Institute, Johannes Gutenberg University, Mainz

GNOME is a novel experimental scheme which enables the investigation of couplings between nuclear spins and exotic fields generated by astrophysical sources. It consists of a network of geographically separated, time synchronized, ultrasensitive ( ∼ fT/ √Hz ) optical atomic magnetometers that measure atomic spin precession in multilayer magnetic shielding. Such a configuration enables the study of global transient effects due to non-magnetic interactions.

Currently, there are six magnetometers placed around the world which are able to measure synchronously. Here is presented a comparison between three different modes of operation of an atomic magnetometer. The bandwidth and sensitivity is analyzed for an open loop, phase lock loop and self-oscillating configurations. The outcome points the phase lock loop configuration as optimal for the GNOME network. With this configuration an optimal compromise between sensitivity and bandwidth is reached.