Dissertation/Thesis Abstract

Characterization of the PULSTAR Ultracold Neutron Source
by Medlin, Graham Lucas, Ph.D., North Carolina State University, 2017, 225; 10610662
Abstract (Summary)

Ultracold neutrons (UCN) are free neutrons with sufficiently low energy such that they may be confined for lengths of time approaching the neutron lifetime. They have great potential for a wide range of experimental studies, however almost all of these studies are limited by the available UCN density. A UCN source is being installed at the PULSTAR reactor at North Carolina State University (NCSU) that will efficiently provide a high UCN flux per available reactor power. The NCSU source is uniquely placed outside the reactor pool and features a system to transport neutrons from the reactor core. This transport is modeled and benchmarked against foil activation measurements. To produce UCN, a heavy water thermal moderator is coupled with a solid methane cold moderator, the temperature of which can be optimized for down-scattering in the solid deuterium UCN converter. This work will present the construction and testing of the NCSU source’s cryostat, cryogenic helium system, and gas handling systems, including a deuterium spin-state converter and Raman spectrometer. Further, this work will characterize the growth of the solid deuterium crystal in our UCN source cryostat.

Indexing (document details)
Advisor: Dougerty, Daniel
School: North Carolina State University
Department: Physics
School Location: United States -- North Carolina
Source: DAI-B 78/10(E), Dissertation Abstracts International
Subjects: Physics
Keywords: Deuterium, Methane, Neutron, Neutrons, PULSTAR, Source
Publication Number: 10610662
ISBN: 978-1-369-85545-6
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