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Quantum Beam Science, Volume 9, Issue 1

2025 March - 10 articles

Cover Story: To lead thermal neutrons from a moderator to a sample under investigation, they are sent through neutron guides with reflective surfaces. Elliptical neutron guides are known to transport neutrons with fewer reflections than straight guides, reducing neutron losses. Since true elliptical shapes are tedious to produce, the elliptical shape may instead be approximated by linearly tapering pieces. In this work, we use the neutron simulation package McStas to investigate this approximation for both simple and realistic guide systems. We show that splitting a model elliptical guide into linear pieces with lengths of up to 3 m does not damage transport properties. For one realistic guide system, we show that the elliptical guide can be approximated with pieces 0.5 m in length without detriment to transport properties. View this paper
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Quantum Beam Sci. - ISSN 2412-382X
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