Properties of elliptical guides for neutron beam transport and applications for new instrumentation concepts

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dc.contributor.authorRodriguez, DMen_AU
dc.contributor.authorKennedy, SJen_AU
dc.contributor.authorBentley, PMen_AU
dc.date.accessioned2012-01-11T04:48:21Zen_AU
dc.date.available2012-01-11T04:48:21Zen_AU
dc.date.issued2011-08-01en_AU
dc.date.statistics2012-01-11en_AU
dc.description.abstractThe use of nonlinear tapered guides is becoming more common in advanced neutron scattering facilities around the world. Elliptical guides offer the promise of high performance not only as focusing devices but as an efficient way to transport neutrons over long distances. Here, the analytical expressions to determine their performance are derived and discussed. Under certain conditions, an increase in flux delivery is observed with increasing guide length, due to an increase in the angular spread of the neutrons reflected in the guide. The performance is only limited by the distance between the source and the guide entrance, the dimensions of the instrument placed after it, and the supermirror coating. As an example of the potential of elliptical geometry in instrumentation, a new small-angle neutron scattering (SANS) instrument concept is proposed, in which the neutron source is directly coupled to a half-ellipse, and the instrumental performance is evaluated by means of analytical expressions. The results show that such an instrument may provide a viable alternative to conventional pinhole SANS for high-resolution measurements and small samples, being substantially more compact and simpler to operate. The main limitation comes from the coma aberration which is inevitable on extended sources. The extent of the coma problem is also analysed. © 2011, Wiley-Blackwell.en_AU
dc.identifier.citationRodriguez, D.M., Kennedy, S.J., & Bentley, P.M. (2011). Properties of elliptical guides for neutron beam transport and applications for new instrumentation concepts. Journal of Applied Crystallography, 44(Part 4), 727-737. doi:10.1107/S0021889811018590en_AU
dc.identifier.govdoc3848en_AU
dc.identifier.issn0021-8898en_AU
dc.identifier.issuePart 4en_AU
dc.identifier.journaltitleJournal of Applied Crystallographyen_AU
dc.identifier.pagination727-737en_AU
dc.identifier.urihttp://dx.doi.org/10.1107/S0021889811018590en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/3977en_AU
dc.identifier.volume44en_AU
dc.language.isoenen_AU
dc.publisherWiley-Blackwellen_AU
dc.subjectNeutron beamsen_AU
dc.subjectSmall angle scatteringen_AU
dc.subjectOptimizationen_AU
dc.subjectCoatingsen_AU
dc.subjectMeasuring instrumentsen_AU
dc.subjectResolutionen_AU
dc.titleProperties of elliptical guides for neutron beam transport and applications for new instrumentation conceptsen_AU
dc.typeJournal Articleen_AU
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