Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 49: POSTER II
MA 49.9: Poster
Donnerstag, 19. März 2015, 15:00–18:00, Poster A
Validation of high brilliant moderators for cold neutrons — •Tobias Cronert1, Jan Philipp Dabruck2, Paul Emanuel Döge2, Yannik Beßler1, Ulrich Rücker1, Carsten Lange3, Michael Butzek1, Wolfgang Hansen3, Rahim Nabbi2, and Thomas Brückel1 — 1JCNS/ZEA1 - Forschungszentrum Jülich — 2NET - RWTH Aachen — 3TU Dresden
Investigation of magnetic phenomenons like chiral spin-density waves (SDW) and skyrmions requires a high flux of cold neutrons for polarized neutron spectroscopy and similar advanced applications. While neutron optics have evolved greatly during the last years, the moderator itself leaves much options for improvement. Using MCNPX, sophisticated moderator configurations are developed allowing for high neutron yields and a high beam brilliance. Calculations propose flat, so called 2-dimensional pancake moderators, of supercritical para hydrogen for the upcoming European Spallation Source. Validation of the calculations however is challenging, since neutron energy spectra from several MeV down to 0.1meV need very high levels of measurement equipment and easily accessible neutron sources. Highly specialized cold moderators, optimized to the energy and time structure of the future neutron sources will yield higher brilliance and available flux at the sample to improve the performance of magnetic scattering methods and neutron applications in Chemistry and Biology.