Advanced instrumentation for magnetic excitations and diffusion – Pushing the MIEZE detector well beyond its limits

Topic  12
Main supervisor J.Jochum (Johanna.Jochum@frm2.tum.de)
MLZ institution TUM
Local supervisor 1 Martin Klein
Institution CDT
Local supervisor 2
Institution
Local supervisor 3
Institution
Local supervisor 4
Institution
Title
Advanced instrumentation for magnetic excitations and diffusion – Pushing the MIEZE detector well beyond its limits
Description

MIEZE is a spin-echo technique optimized for measurements under depolarizing conditions such as applied magnetic fields or magnetic samples. It is ideally suited to study the dynamics of magnons in ferromagnets, skyrmion or superconducting vortex lattices as well as dynamic properties of strongly incoherently scattering (e.g. Hydrogen containing) samples. To achieve highest energy resolutions a neutron detector with extremely high spatial and temporal resolution is needed. Currently, a Cascade detector with 6 10B coated GEM foils with a conversion layer thickness of 0.8-1.5 μm and a pixel size of 1.56mm is used at the instrument RESEDA at the Heinz Maier-Leibnitz Zentrum, allowing for a time resolution, τMIEZE (corresponding to the spin-echo time in classical spin-echo), of several nanoseconds.

With recent developments of the MIEZE setup at RESEDA, such as the implementation of superconducting coils and improvements on the resonating circuits, we have pushed the current Cascade-MIEZE detector towards its limits. In a joint project with CDT Heidelberg, the supplier of the CASCADE detector, we plan to extend the spatial as well as the temporal resolution of the Cascade detector well beyond its current capabilities.