Neutron beam-spot simulation and measurement for various energy bins
ORAL
Abstract
During the 2022 maintenance outage, the installation was completed for the new generation of spallation target-moderator-reflector-shield (TMRS), known as Mark-IV for Manuel Lujan Jr. Neutron Scattering Center (Lujan Center) at the Los Alamos Neutron Science Center (LANSCE). This paper discusses the importance of combining various techniques to ensure high-quality beam delivery to nuclear physics experiments. Advanced laser tracker survey technology was used to inform geometry in the Monte Carlo N-Particle Transport (MCNP) code for beam spot simulation. The beam spot was experimentally measured both by active high-speed gated imaging (utilizing a PI-Max4 imaging camera) and passively using image plates.
Experimental beam-spot images acquired by PI-Max4 with various scintillators were analyzed for each energy decade from 1 meV to 1 MeV by our Python scripts. The measured beam-spot distributions agree very well with our prediction by MCNP simulations and so it confirms the alignment importance for one of our flight paths to ensure uniform beam-spot distributions in the full energy range.
Experimental beam-spot images acquired by PI-Max4 with various scintillators were analyzed for each energy decade from 1 meV to 1 MeV by our Python scripts. The measured beam-spot distributions agree very well with our prediction by MCNP simulations and so it confirms the alignment importance for one of our flight paths to ensure uniform beam-spot distributions in the full energy range.
*This work was supported by the U.S. Department of Energy through the Los Alamos National Laboratory. Los Alamos National Laboratory is operated by Triad National Security, LLC, for the National Nuclear Security Administration of U.S. Department of Energy (Contract No. 89233218CNA000001)
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Presenters
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Josef Svoboda
- Los Alamos National Laboratory