Neutron optics concept for the materials engineering diffractometer at the ESS

0485609 - ÚJF 2018 RIV GB eng C - Konferenční příspěvek (zahraniční konf.)
Šaroun, Jan - Fenske, J. - Rouijaa, M. - Beran, Přemysl - Navrátil, Jan - Lukáš, Petr - Schreyer, A. - Strobl, M.
Neutron optics concept for the materials engineering diffractometer at the ESS.
journal of physics: Conference series. Vol. 746. Bristol: IOP Publishing Ltd., 2016, č. článku 012011. ISSN 1742-6588.
[VI European Conference on Neutron Scattering (ECNS2015). Zaragoza (ES), 30.08.2016-04.09.2016]
Grant CEP: GA MŠMT LM2015048
Institucionální podpora: RVO:61389005
Klíčová slova: diffractometer * Beamline for European Materials Engineering Research * European Spallation Source
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)

The Beamline for European Materials Engineering Research (BEER) has been recently proposed to be built at the European Spallation Source (ESS). The presented concept of neutron delivery optics for this instrument addresses the problems of bi-spectral beam extraction from a small moderator, optimization of neutron guides profile for long-range neutron transport and focusing at the sample under various constraints. They include free space before and after the guides, a narrow guide section with gaps for choppers, closing of direct line of sight and cost reduction by optimization of the guides cross-section and coating. A system of slits and exchangeable focusing optics is proposed in order to match various wavelength resolution options provided by the pulse shaping and modulation choppers, which permits to efficiently trade resolution for intensity in a wide range. Simulated performance characteristics such as brilliance transfer ratio are complemented by the analysis of the histories of 'useful' neutrons obtained by back tracing neutrons hitting the sample, which helps to optimize some of the neutron guide parameters such as supermirror coating.
Trvalý link: http://hdl.handle.net/11104/0280560