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Figure 2
(a) Schematic presentation of the neutron transmission experiment configuration in OpenMC+NCrystal simulations. The incident neutron distribution follows the open-beam spectrum of IMAT, with beam divergence determined by the pinhole diameter and the distance between the pinhole and the sample. The incident neutron wavelength/energy distribution, beam divergence, sample geometry, region of interest (ROI) or detector region and sample-to-detector distance (L) can be flexibly adjusted in the simulations. (b) and (c) Two simulation cases where the sample dimensions are both 10 × 10 × 0.8 cm (width × height × thickness) and the ROIs are both 8 × 3 mm, but with different slit sizes. (d) The setup adopted for the IMAT experiment. See text for more details.

IUCrJ
Volume 13| Part 6| November 2026|
ISSN: 2052-2525
https://doi.org/10.1107/S2052252526008882