MIASANS at the longitudinal neutron resonant spin-echo spectrometer RESEDA

¹ Physik Department, Technische Universität München, D-85748 Garching, Germany
² Jülich Centre for Neutron Science JCNS, Forschungszentrum Jülich GmbH Outstation at MLZ FRM II, D-85747 Garching, Germany
³ Heinz Maier Leibnitz Zentrum (MLZ), Technische Universität München, D-85748 Garching, Germany
⁴ Center for Quantum Engineering (ZQE), Technische Universität München, D-85748 Garching, Germany
⁵ Munich Center for Quantum Science and Technology (MCQST), Technische Universität München, D-85748 Garching, Germany

^* e-mail: jon.leiner@tum.de

Published online: 17 November 2022

Abstract

The RESEDA (Resonant Spin-Echo for Diverse Applications) instrument has been optimized for neutron scattering measurements of quasi-elastic and inelastic processes over a wide parameter range. One spectrometer arm of RESEDA is configured for the MIEZE (Modulation of Intensity with Zero Effort) technique, where the measured signal is an oscillation in neutron intensity over time prepared by two precisely tuned radio-frequency (RF) flippers. With MIEZE, all spin-manipulations are performed before the beam reaches the sample, and thus the signal from sample scattering is not disrupted by any depolarizing conditions there (i.e. magnetic materials and fields). The MIEZE spectrometer is being further optimized for the requirements of small angle neutron scattering (MIASANS), a versatile combination of the spatial and dynamical resolving power of both techniques. We present the current status of (i) the newly installed superconducting solenoids as part of the RF flippers to significantly extend the dynamic range (ii) the development and installation of a new detector on a translation stage within a new larger SANS-type vacuum vessel for flexibility with angular coverage and resolution, and (iii) the efforts to reduce background.