Speakers
Description
The n2EDM experiment at the Paul Scherrer Institut aims to probe the neutron electric dipole moment with a sensitivity below 10$^{-27}$ $e\cdot$$\mathrm{cm}$, requiring an exceptionally clean magnetic environment. To identify minuscule magnetic impurities that could introduce false EDM signals, we developed a mobile gradiometer based on optically pumped cesium magnetometers in the Mx configuration. The system detects dipole moments down to 0.1 nAm$^2$, using differential phase-sensitive readout to map magnetic gradients with sub-picotesla sensitivity. The device leverages the high precision and robustness of cesium magnetometry to scan materials under realistic experimental conditions, providing essential diagnostics for maintaining magnetic integrity in the n2EDM apparatus.
Authors: Luz Sanchez-Real Zielniewicz, Lea Segner, Judith van Keirsbilck, Victoria Kletzl, Georg Bison, Vira Bondar on behalf of the nEDM collaboration
Acknowledgement of grants: Swiss National Science Foundation 200441, 213222 and 236419.
