, C.
, Barker, J.
and Mildner, D.
(2015),
Comparison of Pinhole Collimation and Focusing Optics for SANS, Nuclear Instruments & Methods in Physics Research A, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=917924
(Accessed December 10, 2024)
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Comparison of Pinhole Collimation and Focusing Optics for SANS
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Abstract
We examine quantitatively the instrumental factors that affect the theoretical performance and practical application of conventional pinhole collimation and focusing optics for Small-Angle Neutron Scattering (SANS) measurements. We calculate the relative performance of pinhole collimation vis-a-vis focusing by grazing incidence elliptical mirrors and compare the results with a recent ray-tracing simulation to show that the performance gains due to focusing found in the simulation arise largely from assuming a much large sample size. We also compare measurements of the parasitic scattering from pinhole collimation with that from focusing cylindrical quartz mirrors, and a focusing refractive optic, to stress the importance of signal-to-noise as the true measure of performance for SANS instruments.Citation
Nuclear Instruments & Methods in Physics Research A
Volume
795
Pub Type
Journals
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Keywords
small-angle scattering, neutron optics, parasitic scattering, x ray optics, grazing incidence mirrors, non-specular scattering, focusing mirrors
Citation
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Created September 21, 2015, Updated February 19, 2017