Modelling of an imaging beamline at the ISIS pulsed neutron source

G. Burca, W. Kockelmann, J.A. James, Michael E. Fitzpatrick

    Research output: Contribution to journalArticle

    9 Citations (Scopus)

    Abstract

    A combined neutron imaging and neutron diffraction facility, IMAT, is currently being built at the pulsed neutron spallation source ISIS in the U.K. A supermirror neutron guide is required to combine imaging and diffraction modes at the sample position in order to obtain suitable time of flight resolutions for energy selective imaging and diffraction experiments. IMAT will make use of a straight neutron guide and we consider here the optimization of the supermirror guide dimensions and characterisation of the resulting beam characteristics, including the homogeneity of the flux distribution in space and energy and the average and peak neutron fluxes. These investigations take into account some main design criteria: to maximise the neutron flux, to minimise geometrical artefacts in the open beam image at the sample position and to obtain a good energy resolution whilst retaining a large neutron bandwidth. All of these are desirable beam characteristics for the proposed imaging and diffraction analysis modes of IMAT.
    Original languageEnglish
    JournalJournal of Instrumentation
    Volume8
    Issue numberOctober 2013
    DOIs
    Publication statusPublished - 2013

    Fingerprint

    Neutron sources
    neutron sources
    Neutron
    Neutrons
    Imaging
    Imaging techniques
    neutrons
    Neutron flux
    Diffraction
    Modeling
    flux (rate)
    diffraction
    Neutron diffraction
    spallation
    retaining
    Energy
    homogeneity
    neutron diffraction
    artifacts
    energy

    Bibliographical note

    This paper is available on the Open University repository at: http://oro.open.ac.uk/38749/1/JINST_003P_0713.pdf

    Keywords

    • Beam-line instrumentation (beam position and profile monitors
    • beam-intensity monitors
    • bunch length monitors)
    • Inspection with neutrons
    • Instrumentation for neutron sources
    • Neutron radiography

    Cite this

    Modelling of an imaging beamline at the ISIS pulsed neutron source. / Burca, G.; Kockelmann, W.; James, J.A.; Fitzpatrick, Michael E.

    In: Journal of Instrumentation, Vol. 8, No. October 2013, 2013.

    Research output: Contribution to journalArticle

    Burca, G. ; Kockelmann, W. ; James, J.A. ; Fitzpatrick, Michael E. / Modelling of an imaging beamline at the ISIS pulsed neutron source. In: Journal of Instrumentation. 2013 ; Vol. 8, No. October 2013.
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    abstract = "A combined neutron imaging and neutron diffraction facility, IMAT, is currently being built at the pulsed neutron spallation source ISIS in the U.K. A supermirror neutron guide is required to combine imaging and diffraction modes at the sample position in order to obtain suitable time of flight resolutions for energy selective imaging and diffraction experiments. IMAT will make use of a straight neutron guide and we consider here the optimization of the supermirror guide dimensions and characterisation of the resulting beam characteristics, including the homogeneity of the flux distribution in space and energy and the average and peak neutron fluxes. These investigations take into account some main design criteria: to maximise the neutron flux, to minimise geometrical artefacts in the open beam image at the sample position and to obtain a good energy resolution whilst retaining a large neutron bandwidth. All of these are desirable beam characteristics for the proposed imaging and diffraction analysis modes of IMAT.",
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    AU - James, J.A.

    AU - Fitzpatrick, Michael E.

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    KW - Neutron radiography

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