Monte-Carlo Simulations for the optimisation of a TOF-MIEZE Instrument

TL;DR

This paper uses Monte-Carlo simulations to optimize a MIEZE neutron scattering instrument design, considering beam divergence and sample size, with potential application at the European Spallation Source.

Contribution

It introduces a detailed Monte Carlo simulation approach for optimizing a MIEZE instrument design, including beam divergence and sample effects, for future neutron scattering facilities.

Findings

Optimized MIEZE instrument design using Monte Carlo simulations.

Identified effects of beam divergence and sample size on instrument performance.

Potential application at the European Spallation Source.

Abstract

The MIEZE (Modulation of Intensity with Zero Effort) technique is a variant of neutron resonance spin echo (NRSE), which has proven to be a unique neutron scattering technique for measuring with high energy resolution in magnetic fields. Its limitations in terms of flight path differences have already been investigated analytically for neutron beams with vanishing divergence. In the present work Monte-Carlo simulations for quasi-elastic MIEZE experiments taking into account beam divergence as well as the sample dimensions are presented. One application of the MIEZE technique could be a dedicated NRSE-MIEZE instrument at the European Spallation Source (ESS) in Sweden. The optimisation of a particular design based on Montel mirror optics with the help of Monte Carlo simulations will be discussed here in detail.