Minimising the Residual Field and Field Gradient in a Magnetically Shielded Room for an nEDM experiment at Los Alamos National Laboratory
Arts and Sciences
The LANL neutron Electric Dipole Moment (nEDM) experiment is an effort to set a sensitivity limit of 3.2 × 10-27 e·cm on the electric dipole moment of the neutron, an order of magnitude smaller than the current upper limit. The experiment is enclosed in a two layer Mu-metal magnetically shielded room (MSR) to eliminate magnetic noise from the environment. The MSR is degaussed to sufficiently reduce its residual magnetic field and field gradient. The MSR is designed for residual fields as low as 30 nT while the experiment requires a field gradient of 1 nT/m or smaller. Here we report on the degaussing procedure and the resulting improvement in the shielding prowess of the MSR.
Amarasinghe, Chamindu S., "Minimising the Residual Field and Field Gradient in a Magnetically Shielded Room for an nEDM experiment at Los Alamos National Laboratory" (2017). Summer Interdisciplinary Research Symposium. 10.