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.