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Neutron Ray-Tracing Simulations of a New Supermirror Guide for the Osiris Spectrometer

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Abstract

A new supermirror guide has been proposed to replace the current neutron guide of the indirect time-of-flight near-backscattering spectrometer OSIRIS at the ISIS facility. Here we present an extensive Monte Carlo simulation study for the design and optimisation of a new guide system. Among the several guide geometry assessed, a curved guide with elliptical defocusing and focusing sections is shown to perform best. The estimated gain in intensity is a factor of 5–6 at the sample position with a homogeneous distribution of the divergence. The elliptic geometry results in a smaller beam spot and smaller samples will particularly benefit from this upgrade. The proposed guide replacement will ensure that the OSIRIS spectrometer will remain competitive in the years to come.

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Notes

  1. See McStas documentation [23] for the empirical formula modelling the reflectivity profile.

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Funding

This work was supported by the Science and Technology Facilities Council (STFC) and by the Swedish Research Council (VR, Grant no. 2016-06958).

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Authors and Affiliations

  1. Department of Physics and Astronomy, Uppsala University, 752 37, Uppsala, Sweden

    A. Perrichon & M. Wolff

  2. ISIS Facility, Rutherford Appleton Laboratory, OX11 0QX, Chilton, Didcot, Oxfordshire, United Kingdom

    A. Perrichon, F. Fernandez-Alonso & F. Demmel

  3. Department of Physics and Astronomy, University College London, WC1E 6BT, London, United Kingdom

    F. Fernandez-Alonso

  4. Department of Chemistry and Chemical Engineering, Chalmers University of Technology, 412 96, Göteborg, Sweden

    M. Karlsson

Authors
  1. A. Perrichon
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  2. F. Fernandez-Alonso
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  3. M. Wolff
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  4. M. Karlsson
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  5. F. Demmel
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Correspondence to A. Perrichon.

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Perrichon, A., Fernandez-Alonso, F., Wolff, M. et al. Neutron Ray-Tracing Simulations of a New Supermirror Guide for the Osiris Spectrometer. J. Surf. Investig. 14 (Suppl 1), S169–S174 (2020). https://doi.org/10.1134/S1027451020070381

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