| dc.description | A growing community of scientists has been using neutrons in the most diverse areas
of science. In order to meet the researchers demand in the areas of physics, chemistry, materials
sciences, engineering, cultural heritage, biology and earth sciences, the Brazilian Multipurpose
Reactor (RMB) will provide 3 thermal guides and 3 cold guides, with the installation of several
instruments for materials characterization. In this study, we present a standard design requirement
of two primordial instruments, namely Sabi?? and Araponga. They are, respectively, cold and
thermal neutron instruments and correspond to a Small-Angle Neutron Scattering (SANS) and
High-Resolution Powder Neutron Diffractometer (HRPND) to be installed in the Neutron Guide
Building (N02) of RMB. To provide adequate flux for both instruments, we propose here an initial
investigation of the use of simple and split guides to transport neutron beams to two different
instruments on the same guide. For this purpose, we use Monte Carlo simulations utilizing McStas
software to check the efficiency of thermal neutron transport for different basic configuration and
sources. By considering these results, it is possible to conclude that the split guide configuration
is, in most cases, more efficient than cases that use transmitted neutron beams independently of
source. We also verify that the employment of different coating indexes for concave and convex
surfaces on curved guides is crucial, at least on simulated cases, to optimise neutron flux (intensity
and divergence) and diminish facility installation cost. | |
