Mainz 2017 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 23: Trapped ions
A 23.3: Vortrag
Mittwoch, 8. März 2017, 15:15–15:30, N 3
First data analysis schemes for the Global Network of Optical Magnetometers for Exotic physics searches (GNOME) — •Hector Masia-Roig1, Vincent Dumont2, Arne Wickenbrock1, Chris Pankow3, Samer Afach1, and Dmitry Budker1 — 1Helmholtz Institute, Johannes Gutenberg University, Mainz — 2University of California, Berkeley, USA — 3Northwestern University, Evanston, USA
This presentation is prepared on behalf of the GNOME collaboration. 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. This presentation discusses the first techniques used for the analysis of time synchronized data and the results obtained. The algorithm is based on an excess power analysis. It surveys the data looking for regions in the time-frequency space where the power density exceeds the noise floor. This method enables one to find weak signals in a noisy environment without a specific wavelet shape. A 24 h coordinated run is analyzed and the excess power regions are identified. This information is then cross-correlated between the different magnetometers in the network.