Major redesign of RESEDA

The neutron resonant spin echo (NRSE) spectrometer RESEDA at the Maier-Leibnitz Zentrum (MLZ) in Garching underwent a major redesign in recent years. It now permits longitudinal NRSE (LNRSE) spectroscopy as well as longitudinal MIEZE (Modulation of Intensity with zero effort) operation with sub-µeV energy resolution and an unprecedented dynamic range.

RESEDA's LNRSE option represents a set-up akin a conventional NSE spectrometer. Conventional NSE coils between the resonant flipper coils may be used for field integral subtraction, thereby massively extending the dynamic range. Typical momentum transfers currently accessible are between 0.035 Å^-1 and 1 Å^-1.

A unique feature of RESEDA is the MIEZE set-up for studies under depolarizing conditions. MIEZE also proves to be extremely successful in combination with SANS (MIEZE-SANS) where scientific challenges in ferromagnets, superconducting vortex lattices, and magnetic skyrmion systems have been addressed recently. The implementation of phase-locking of the neutron polarization enables inelastic measurements as demonstrated for magnons in ferromagnetic iron, where the intermediate scattering function features an oscillatory component. The standard range of scattering vectors ranges here from 0.005 Å^-1 to 1 Å^-1 at spin echo times from 0.1 ps up to 10 ns. For neutron detection the MIEZE option uses a bespoke Cascade 2D position sensitive detector with an active area of 200 × 200 mm². An application to calculate the signal reduction factor for various sample geometries can be found within the FRM2 WebApps.

For more information about the instrument or possible experiments please get in touch with the instrument responsibles Christian Franz (christian.franz@frm2.tum.de) or Johanna K. Jochum (johanna.jochum@frm2.tum.de)