Speaker
Description
We are currently developing a high-resolution powder diffractometer for the GT1 beamline of the RA-10 multipurpose research reactor at the Argentine Laboratory for Neutron Beams (LAHN). The optimization of the instrument neutron optics requires realistic simulations capable of reproducing the spatial, angular, and chromatic distributions of the incident neutron beam.
In this work, we present the implementation of a neutron source model based on KDSource, trained from neutron distributions generated with TRACS Monte Carlo simulations. The resulting model replaces the direct use of particle files (MCPL) while preserving the statistical properties of the original source, reducing the computational cost of instrument simulations in McStas while improving neutron statistics and mitigating the limitations associated with the limited number of particles available in the original source file. The source model is used to evaluate the performance of the neutron guide system at different stages along the neutron beamline through the analysis of neutron flux, beam divergence, and energy spectrum evolution along the guide. These results provide quantitative criteria for the optimization of the neutron optics and support the ongoing design of the high-resolution powder diffractometer for LAHN.
Key Words
neutron source model
powder diffractometer
neutron optics