UCN Detector development for the TRIUMF Neutron EDM experiment
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Date
2016
Authors
Fleurette, Doresty Fonseca
Journal Title
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Abstract
A new measurement of the neutron electric dipole moment (nEDM) is being
developed at TRIUMF, where a high density source of ultra cold neutrons
(UCN) is currently under construction. A fast, high-efficiency UCN detector
is needed for the experiment, and a 6-Li doped glass scintillation detector is
being explored for this purpose. In this work, simulations and test measurements
were carried out to optimize the light guide design for the new UCN
detector. Acrylic and air-core light guides, the latter with two different reflecting
surfaces, were considered. Three prototype light guides were constructed
and tested, and results were compared with simulations. The best solution
was found to be an acrylic guide, wrapped with mylar foil. For a guide 12
cm in length as required by the experimental layout, a lower limit of approximately
25 photoelectrons per neutron capture was established for the proposed
geometry and photomultiplier configuration.
Description
Keywords
UCN Detector, TRIUMF, Neutron EDM, Li-doped glass scintillators, Light guide, Air-core light, Geant4, Light collection, Npe, Photoelectrons, Cold Neutron Production, UCN production, Moderation process, KEK–RCNP, Lithium glass, nEDM, Miro, GS20, GS30, CP violation, Ramsey, Spallation, Superthermal, He-II, 241Am source, CAEN VME