The magnetometer system planned for the neutron electric dipole moment (nEDM) experiment at LANL

The nEDM experiment at Los Alamos National Laboratory (LANL), with its upgraded ultracold neutron source, aims to improve this measurement to $3.0\times 10^{-27} e \cdot cm$, which is an order of magnitude smaller than the current best limit. In controlling the magnetic field background to achieve this sensitivity, we plan to implement mercury (Hg$^{199}$)---both as the co-magnetometer and as an external magnetometer. The latter would be the first implementation of its kind for nEDM applications. I will describe the state-of-the-art techniques to instrument these magnetometers, including the laser system to polarize and detect the spin-dependent interactions and the making of these highly specialized optical cells to contain the mercury vapors.