A Turntable Switcher Intersection for the LANL nEDM experiment

Faculty Sponsor

Shirvel Stanislaus


Arts and Sciences



Presentation Type

Poster Presentation

Symposium Date

Spring 2018


The goal of the nEDM experiment at Los Alamos National Laboratory (LANL) is to improve the current upper limit of the magnitude of the neutron’s electric dipole moment (nEDM) to an accuracy of approximately 10-27 e * cm. The experiment will make use of the Ramsey method of oscillatory magnetic field pulses to determine the value of the neutron’s precession frequency, both before and after an electric field is applied. The change in this precession frequency can then be used to calculate the nEDM. In the experiment, ultra-cold neutrons travel from the source into a chamber, where the Ramsey magnetic field pulses are applied. They then connect to a detector that measures the polarization of the neutrons. A turntable switcher was constructed to form connections between the source, Ramsey field chamber, and detector. Controlled by a rotary motor, the switcher turns to orient guide pipe sections, first connecting the source to the field room and then the field room to the detector. Discussion of switcher assembly, as well as results of switcher configuration, will be presented.

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