Clément Desalme, Jason Pioquinto, Valentin Czamler, Stefan Baeßler, Kazimierz Bodek, Valery Nesvizhevsky, Dagmara Rozpędzik, Katharina Schreiner, Torsten Soldner
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Towards improving the PF1B beamline McStas model through simulations of a beam characterization experiment.
The PF1B instrument at the Institut Laue-Langevin (ILL) delivers a high-flux cold neutron beam through the H113 neutron guide. In the years following the characterization published with the highest polarization in 2006, radiation-damaged sections of the guide have been replaced and the in-pile part has been upgraded. In 2024, a new experiment using time of flight was performed to characterize the instrument. Simulations intended to reproduce this experiment have been performed with McStas using an already existing model of H113. In this work, we present a first comparison of experimental and simulated time-of-flight spectra, showing overall good agreement but discrepancies which might be reduced by adjusting the existing McStas model. Parameter optimization is ongoing, aiming at a more accurate description that would serve for future experiments on PF1B.
期刊介绍：
Many research topics in condensed matter research, materials science and the life sciences make use of crystallographic methods to study crystalline and non-crystalline matter with neutrons, X-rays and electrons. Articles published in the Journal of Applied Crystallography focus on these methods and their use in identifying structural and diffusion-controlled phase transformations, structure-property relationships, structural changes of defects, interfaces and surfaces, etc. Developments of instrumentation and crystallographic apparatus, theory and interpretation, numerical analysis and other related subjects are also covered. The journal is the primary place where crystallographic computer program information is published.
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