Demonstration of a single-crystal reflector-filter for enhancing slow neutron beams

G. Muhrer, T. Schonfeldt, E. B. Iverson, M. Mocko, D. V. Baxter, Th. Hügle, F. X. Gallmeier, Esben Bryndt Klinkby

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    The cold polycrystalline beryllium reflector-filter concept has been used to enhance the cold neutron emission of cryogenic hydrogen moderators, while suppressing the intermediate wavelength and fast neutron emission at the same time. While suppressing the fast neutron emission is often desired, the suppression of intermediate wavelength neutrons is often unwelcome. It has been hypothesized that replacing the polycrystalline reflector-filter concept with a single-crystal reflector-filter concept would overcome the suppression of intermediate wavelength neutrons and thereby extend the usability of the reflector-filter concept to shorter but still important wavelengths. In this paper we present the first experimental data on a single-crystal reflector-filter at a reflected neutron source and compare experimental results with hypothesized performance. We find that a single-crystal reflector-filter retains the long-wavelength benefit of the polycrystalline reflector-filter, without suffering the same loss of important intermediate wavelength neutrons. This finding extends the applicability of the reflector-filter concept to intermediate wavelengths, and furthermore indicates that the reflector-filter benefits arise from its interaction with fast (background) neutrons, not with intermediate wavelength neutrons of potential interest in many types of neutron scattering. (C) 2016 Elsevier B.V. All rights reserved.
    Original languageEnglish
    JournalNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
    Volume830
    Pages (from-to)454-460
    Number of pages7
    ISSN0168-9002
    DOIs
    Publication statusPublished - 2016

    Keywords

    • Moderator
    • Neutron
    • Beam
    • Reflector-filter

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