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Figure 2
Results of McStas simulations of the Wolter-I type condenser for use at the ODIN instrument. (a) Spectrum of ODIN with (purple) and without (green) the frame-rate multiplication (FRM) chopper activated. (b) The divergence of the beam just upstream of the condenser. (c) Spatial distribution of the beam just downstream of the condenser. (d) 2D divergence distribution at the focal point. (e) Horizontal and (f) vertical divergence as a function of the position along the beam, z. (g) Spatial distribution, measured at the focal point. (i) Gain factor of neutron flux as a function of the distance from the nominal focal point. The first peak in (i) corresponds to the focal point; the second peak stems from a geometrical artifact caused by a single reflection on the Wolter-I optic. (h) The spatial distribution of the artificial beam spot at 0.6 m is correspondingly diffuse.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 59| Part 4| August 2026| Pages 1282-1293
https://doi.org/10.1107/S1600576726006254
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