In-beam background suppression shield

V. Santoro, Xiao Xiao Cai, D. D. DiJulio, S. Ansell, P. M. Bentley

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    Abstract

    The long (3 ms) proton pulse of the European Spallation Source (ESS) gives rise to unique and potentially high backgrounds for the instrument suite. In such a source an instrument's capabilities will be limited by its Signal to Noise (S/N) ratio. The instruments with a direct view of the moderator, which do not use a bender to help mitigate the fast neutron background, are the most challenging. For these beam lines we propose the innovative shielding of placing blocks of material directly into the guide system, which allow a minimum attenuation of the cold and thermal fluxes relative to the background suppression. This shielding configuration has been worked into a beam line model using Geant4. We study particularly the advantages of single crystal sapphire and silicon blocks.
    Original languageEnglish
    JournalJournal of Neutron Research
    Volume18
    Issue number4
    Pages (from-to)135-144
    Number of pages10
    ISSN1023-8166
    DOIs
    Publication statusPublished - 2015

    Keywords

    • Filter
    • Instrument backgrounds
    • Neutrons
    • Sapphire
    • Spallation source

    Cite this

    Santoro, V., Cai, X. X., DiJulio, D. D., Ansell, S., & Bentley, P. M. (2015). In-beam background suppression shield. Journal of Neutron Research, 18(4), 135-144. https://doi.org/10.3233/JNR-160034