SKM 2023 – scientific programme
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MA: Fachverband Magnetismus
MA 40: Poster Magnetism II
MA 40.42: Poster
Thursday, March 30, 2023, 14:00–16:00, P2/EG
Comparison of continuous and pulsed neutron sources for MIEZE witz McStas. — •Korbinian Fellner1, Johanna K. Jochum1, Lukas Vogl1, Lukas Beddrich1, Jonathan Leiner1, Christian Franz2, and Christian Pfleiderer3 — 1Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Garching, Germany — 2Jülich Centre for Neutron Science JCNS-MLZ, Germany — 3Physik-Department, Technische Universität München, Germany
The MIEZE method is a type of the neutron spin-echo technique that uses oscillating neutron intensities to record changes to the energy of a scattered neutron. This allows MIEZE, which is implemented at the spectrometer RESEDA to study magnetic dynamics, quantum phenomena, and molecular diffusion in soft matter, to achieve an energy resolution of neV, taking advantage of a broad wavelength band of Δλ/λ=11.6 %. Nonetheless, a significant portion of the neutron beam is discarded by the velocity selector, making MIEZE at pulsed neutron sources increasingly attractive. We have implemented the polarization shaping components of RESEDA in the McStas framework to investigate the feasibility and data reduction of a MIEZE spectrometer at a pulsed neutron source (PNS). The large wavelength spread of a PNS allows for the measurement of the intermediate scattering function over many points in Fourier time, similar to a multi-detector option at a triple-axis spectrometer. Simulations of a quasielastic sample enable a comparison of the performance between a reactor source and a PNS. Additionally, tests of crucial data reduction algorithms that have not been addressed in previous instrument proposals, are discussed.