Monte-Carlo simulations for the optimisation of a TOF-MIEZE instrument

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 713; pp. 71 - 75
• Main Authors: Weber, T., Brandl, G., Georgii, R., Häußler, W., Weichselbaumer, S., Böni, P.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 11-06-2013
• Subjects: Beams (radiation); Computer simulation; Detectors; Divergence; Echo surveys; ESS; Measuring instruments; MIEZE; MISANS; Monte Carlo methods; Monte Carlo Simulation; Optimization; Spin echo; Spin echo; MIEZE; ESS; Monte Carlo Simulation; MISANS
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/j.nima.2013.03.010

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.