Neutron optics concept for the materials engineering diffractometer at the ESS

Research output: Contribution to journalArticle

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.

Details

Authors
  • J. Šaroun
  • J. Fenske
  • M. Rouijaa
  • P. Beran
  • J. Navrátil
  • P. Lukáš
  • A. Schreyer
  • M. Strobl
External organisations
  • Helmholtz-Zentrum Geesthacht
  • Czech Technical University in Prague
  • Nuclear Physics Institute, ASCR
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Accelerator Physics and Instrumentation
Original languageEnglish
Article number012011
JournalJournal of Physics: Conference Series
Volume746
Issue number1
Publication statusPublished - 2016 Oct 10
Publication categoryResearch
Peer-reviewedYes