Speaker
Description
Measurements of the neutron electric dipole moment (nEDM) provide a sensitive probe
of CP-violating beyond the Standard Model physics. The Los Alamos National
Laboratory (LANL) nEDM experiment is a double-cell ultracold neutron (UCN)
experiment that aims to achieve a statistical sensitivity of 2 x 10-27 e cm, an order-of-
magnitude smaller than the current experimental limit. To control magnetic-field-related
systematic effects, the experiment will use an array of 87Rb optically-pumped
magnetometers (OPMS) to continuously monitor the magnetic field and its gradients
surrounding the neutron storage cells. This presentation will provide an overview of the
characterization of the 87Rb OPMs, focusing on their sensitivity, stability, and ability to
track variations of the magnetic-field and gradients during the neutron free-precession
period. Progress on development of free-space laser and fiber coupled 133Cs
magnetometers to expand the array will also be described.