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A silicon analyser for the OSIRIS spectrometer: An analytical and Monte Carlo simulation study
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics. Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England.
Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England;UCL, Dept Phys & Astron, Gower St, London WC1E 6BT, England.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.ORCID iD: 0000-0002-7517-8204
Chalmers Univ Technol, Dept Chem & Chem Engn, S-41296 Gothenburg, Sweden.
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2019 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 947, article id 162740Article in journal (Refereed) Published
Abstract [en]

The indirect time-of-flight near-backscattering spectrometer OSIRIS at the ISIS Facility is being upgraded with the addition of a silicon analyser. The new analyser bank will allow to increase the dynamic range, giving access to relaxation times up to 400 ps, and provide a further dimension in momentum transfer detection with the help of position-sensitive detectors. Here we present analytical calculations for the energy resolution and an extensive Monte Carlo simulation study to assess the performance of the new analyser bank. Simulation and calculation agree perfectly and confirm the initial design parameters of the spectrometer. The simulations predict similar detected intensity but with a higher resolution compared to the existing analyser setup using pyrolytic graphite crystals. Furthermore, the simulations stress the importance of the sample height for this setup and point toward a necessary further upgrade of the guide system. Further improvements of the energy resolution might be achieved with a pulse shaping chopper.

Place, publisher, year, edition, pages
ELSEVIER , 2019. Vol. 947, article id 162740
Keywords [en]
Neutron spectrometer, Monte Carlo simulations
National Category
Accelerator Physics and Instrumentation
Identifiers
URN: urn:nbn:se:uu:diva-396417DOI: 10.1016/j.nima.2019.162740ISI: 000489625000003OAI: oai:DiVA.org:uu-396417DiVA, id: diva2:1368301
Funder
Swedish Research Council, 2016-06958Available from: 2019-11-06 Created: 2019-11-06 Last updated: 2019-11-06Bibliographically approved

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Wolff, Max

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