The monochromatic imaging mode of a RITA-type neutron spectrometer

C.R.H. Bahl, P. Andersen, S.N. Klausen, K. Lefmann

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    The imaging monochromatic mode of a neutron spectrometer with a multi-bladed RITA analyser system is so far unexplored. We present analytical calculations that define the mode. It is shown that the mode can be realised for PG (002) analyser crystals, from incident energies of about 3.2 meV and up, allowing the important cases of 3.7, 5.0 and 13.7 meV. Due to beam divergence, the neutron rays from neighbouring analyser blades are found to overlap slightly. Hence, the optimal use of the monochromatic imaging mode would be found by employing an adjustable radial collimator to limit the spread of the ray from each analyser blade.
    Original languageEnglish
    JournalNuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms
    Volume226
    Issue number4
    Pages (from-to)667-681
    ISSN0168-583X
    DOIs
    Publication statusPublished - 2004

    Keywords

    • Neutron spectrometers
    • Multiple analyser

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