Impact of motion along the field direction on geometric-phase-induced false electric dipole moment signals

摘要

Geometric-phase-induced false electric dipole moment (EDM) signals, resultingfrom interference between magnetic field gradients and particle motion inelectric fields, have been studied extensively in the literature, especiallyfor neutron EDM experiments utilizing stored ultracold neutrons andco-magnetometer atoms. Previous studies have considered particle motion in thetransverse plane perpendicular to the direction of the applied electric andmagnetic fields. We show, via Monte Carlo studies, that motion along the fielddirection can impact the magnitude of this false EDM signal if the wallsurfaces are rough such that the wall collisions can be modeled as diffuse,with the results dependent on the size of the storage cell's dimension alongthe field direction.