Ina128 Instrumentation Amp

Prepared For Submission To Jinst

Neutron Guide Building Instruments of the Brazilian

Multipurpose Reactor (Rmb) Project

A.P.S. Souza,a* L.P. de Oliveira,a F. Yokaichiya,b F.A. Genezini,a and M.K.K.D. Francoa

A Projeto Do Reator Multipropósito Brasileiro,

Instituto de Pesquisas Energéticas e Nucleares (IPEN), São Paulo – Brazil

B Departamento De Física,

Universidade Federal do Paraná (UFPR), Curitiba – Brazil ABSTRACT: 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 Sabiá 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.

Figure: System Model & Simulation Flow for Ina128 Instrumentation Amp

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.

Figure: System Model & Simulation Flow for Ina128 Instrumentation Amp

KEYWORDS: Instrumentation for neutron sources, Neutron sources, Instrument optimisation,

Simulation Methods And Programs

* Corresponding author.

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