Neutron Ray-Tracing Simulations of a New Supermirror Guide for the Osiris Spectrometer
Journal article, 2020

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.

quasielastic neutron scattering


Monte Carlo simulations

neutron spectrometer


Adrien Perrichon

Uppsala University

STFC Rutherford Appleton Laboratory

F. Fernandez-Alonso

STFC Rutherford Appleton Laboratory

University College London (UCL)

M. Wolff

Uppsala University

Mikael Karlsson

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

F. Demmel

STFC Rutherford Appleton Laboratory

Journal of Surface Investigation

1027-4510 (ISSN)

Vol. 14 S169-S174

Surface/interface dynamics investigated with neutron scattering

Swedish Research Council (VR), 2017-01-01 -- 2020-12-31.

Subject Categories

Accelerator Physics and Instrumentation

Aerospace Engineering

Probability Theory and Statistics



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