Neutron optics concept for the materials engineering diffractometer at the ESS

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Abstract

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.

Detaljer

Författare
  • J. Šaroun
  • J. Fenske
  • M. Rouijaa
  • P. Beran
  • J. Navrátil
  • P. Lukáš
  • A. Schreyer
  • M. Strobl
Externa organisationer
  • Helmholtz-Zentrum Geesthacht
  • Czech Technical University in Prague
  • Nuclear Physics Institute, ASCR
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Acceleratorfysik och instrumentering
Originalspråkengelska
Artikelnummer012011
TidskriftJournal of Physics: Conference Series
Volym746
Utgåva nummer1
StatusPublished - 2016 okt 10
PublikationskategoriForskning
Peer review utfördJa