Monte Carlo simulations of the S-shaped neutron guide
Abstract
Neutron transport along guides is governed by the Liouville theorem and the technology involved has advanced in recent decades. Computer simulations have proven to be useful tools in the design and conception of neutron guide systems in facilities. In this study, we use a Monte Carlo method to perform simulations for an S-shaped neutron guide with different dimensions for a Small-Angle Neutron Scattering (SANS) instrument, through the MCSTAS software. A wavelength cutoff is observed and shown to be dependent on the geometrical parameters of the guide. Results for the neutron flux at sample position are presented and a greater sensitivity of cutoffs concerning the curvatures of the guides than to their lengths is noticed. Our results are in agreement with those obtained from the Acceptance Diagram method and we analyze the beam divergence behavior along the S-shaped guide.
Keywords
Cite
@article{arxiv.1912.03081,
title = {Monte Carlo simulations of the S-shaped neutron guide},
author = {Luiz P. de Oliveira and Alexandre P. S. Souza and Fabiano Yokaichiya and Frederico A. Genezini and Margareth K. K. D. Franco},
journal= {arXiv preprint arXiv:1912.03081},
year = {2020}
}
Comments
15 pages, 10 figures, Accepted in Journal of Instrumentation