Simulations of the nEDM@SNS light collection system efficiency
arXiv:2110.03930 · doi:10.1088/1748-0221/17/04/T04007
Abstract
A system for collecting the scintillation light produced by the capture process of ultra-cold neutrons (UCN) on polarized He is discussed and results from simulations of its performance are presented. This system will be implemented in nEDM@SNS, the experiment searching for the neutron electric dipole moment (nEDM) at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory. Simulation results show that the light collection system collects on average 17 photoelectrons per UCN-He capture event (sufficient to generate a robust signal), reconstructs the event location in the beam direction to approximately 3 cm accuracy, detects capture events with a high and spatially uniform efficiency (0.95 with 1% variation), and rejects greater than 50% of beta decay background events.
arXiv comment14 pages, 13 figures. Submitted to Journal of Instrumentation
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