The Magnetically Shielded Room for the Neutron Electric Dipole Moment Experiment at LANL*

The Standard Model predicts a neutron electric dipole moment (nEDM) on the order of 10^-32 e-cm. An nEDM greater than this predicted value would provide evidence for CP violating physics beyond the Standard Model. The experiment in development at the Los Alamos National Laboratory (LANL) ultracold neutron (UCN) source aims to measure the neutron EDM (with an uncertainty/to a sensitivity of) ~ 3x10^-27 e-cm using Ramsey's separated oscillatory field method. A measurement of this precision requires magnetic fields that are uniform to 0.1 nT/m and stable for hundreds of seconds. Therefore, a state-of-the-art magnetically shielded room (MSR) is needed. We have constructed an MSR with 4 mu-metal layers and one copper layer with an internal dimension of 2.3 m x 2.3 m x 2.3 m at the LANL UCN experimental area. This talk will discuss the design of the MSR, its current performance, and the results and stability of the degaussing procedure.