Open AccessA diffractometer project for Brazilian Multipurpose Reactor (RMB): McStas simulations and instrument optimization
Author(s) -
Alexandre Pinho dos Santos Souza,
Luiz Paulo de Oliveira,
Fabiano Yokaichiya,
Frederico A. Genezini,
Margareth K.K.D. Franco
Publication year - 2021
Publication title -
brazilian journal of radiation sciences
Language(s) - English
Resource type - Journals
ISSN - 2319-0612
DOI - 10.15392/bjrs.v9i1a.1499
Subject(s) - diffractometer , neutron flux , neutron , research reactor , sample (material) , monte carlo method , flux (metallurgy) , position (finance) , nuclear engineering , neutron scattering , nuclear physics , physics , optics , computer science , materials science , mathematics , engineering , statistics , scanning electron microscope , finance , economics , metallurgy , thermodynamics
High-resolution diffractometer is one of the first instruments of the set of 15 priority neutron scattering instruments to be installed at the Brazilian Multipurpose Reactor (RMB). A basic project of this instrument consists of the existence of three guides through which neutrons pass from source to sample to guarantee maximum neutron flux at the sample position. In this study, we investigate guide geometry performance considering fixed diffractometer geometry and spatial arrangement. Comparisons between different guide shapes and supermirrors are performed using software based on the Monte Carlo method, McStas. Our conclusion shows that a better solution is splitting the initial flux into two different guides to obtain the maximum flux at the sample position.