SOUZA, ALEXANDRE P.S.OLIVEIRA, LUIZ P. deYOKAICHIYA, FABIANOGENEZINI, FREDERICO A.FRANCO, MARGARETH K.K.D.2020-01-032020-01-03SOUZA, ALEXANDRE P.S.; OLIVEIRA, LUIZ P. de; YOKAICHIYA, FABIANO; GENEZINI, FREDERICO A.; FRANCO, MARGARETH K.K.D. A diffractometer project for Brazilian Multipurpose Reactor (RMB): McStas simulations and instrument optimization. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, October 21-25, 2019, Santos, SP. <b>Proceedings...</b> Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2019. p. 1190-1199. Disponível em: http://repositorio.ipen.br/handle/123456789/30558.http://repositorio.ipen.br/handle/123456789/30558High-resolution di ractometer is one of the rst 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 ux at the sample position. In this study we investigate guide geometry performance considering xed di ractometer geometry and spatial arrangement. Comparisons between di erent 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 ux into two di erent guides to obtain the maximum ux at the sample position.1190-1199openAccesscomputer codescomputerized simulationconfigurationdiffractometersmonte carlo methodneutron fluxneutron guidesneutron sourcesoptimizationrmb reactorTexto completo de evento0000-0002-6318-6805https://orcid.org/0000-0002-6318-6805