Primary Submission Contact

Chamindu Amarasinghe

Faculty Sponsor

Shirvel Stanislaus

Faculty Sponsor Email Address


Arts and Sciences



Document Type

Poster Presentation


Fall 10-27-2017


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. This measurement uses Ramsey’s method of oscillating magnetic fields. The magnetic field and field gradient have to be low enough to avoid the smearing of the Ramsey fringes and increase the neutron dephasing time respectively. The experiment is enclosed in a two layer Mu-metal magnetically shielded room (MSR) to null any external magnetic fields 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. The experiment further 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.

Biographical Information about Author(s)

Chami wishes to go to graduate school to study theoretical physics.

Additional Presentation Information

Wall Poster