Simulating neutron transport in long beamlines at a spallation neutron source using Geant4

DiJulio, Douglas D.; Svensson, Isak; Cai, X.; Cederkäll, J.; Bentley, Phillip M.

doi:10.3233/jnr-190134

Cited by 4 publications

(2 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Monte Carlo simulations were performed using Geant4 version 10.07 patch 2, which we chose in this work due to its open-source licensing, the ease with which the physics models in the code can be manually modified, and the extensive institutional expertise at ANSTO and the University of Wollongong with this toolkit 37 – 40 . Geant4 has previously been used for many similar projects, including neutron transport as well as the design of the neutron beam and beamline components 41 – 43 . For all simulations, inter-simulation variation was estimated for 95% confidence intervals.…”

Section: Methodsmentioning

confidence: 99%

A Monte Carlo model of the Dingo thermal neutron imaging beamline

Jakubowski,

Chacon,

Tran

et al. 2023

Sci Rep

View full text Add to dashboard Cite

In this study, we present a validated Geant4 Monte Carlo simulation model of the Dingo thermal neutron imaging beamline at the Australian Centre for Neutron Scattering. The model, constructed using CAD drawings of the entire beam transport path and shielding structures, is designed to precisely predict the in-beam neutron field at the position at the sample irradiation stage. The model’s performance was assessed by comparing simulation results to various experimental measurements, including planar thermal neutron distribution obtained in-beam using gold foil activation and $$^{10}$$ 10 B$$_{4}$$ 4 C-coated microdosimeters and the out-of-beam neutron spectra measured with Bonner spheres. The simulation results demonstrated that the predicted neutron fluence at the field’s centre is within 8.1% and 2.1% of the gold foil and $$^{10}$$ 10 B$$_{4}$$ 4 C-coated microdosimeter measurements, respectively. The logarithms of the ratios of average simulated to experimental fluences in the thermal (E$$_{th}<$$ th < 0.414 eV), epithermal (0.414 eV < E$$_{epi}<$$ epi < 11.7 keV) and fast (E$$_{fast}>$$ fast > 11.7 keV) spectral regions were approximately − 0.03 to + 0.1, − 0.2 to + 0.15, and − 0.4 to + 0.2, respectively. Furthermore, the predicted thermal, epithermal and fast neutron components in-beam at the sample stage position constituted approximately 18%, 64% and 18% of the total neutron fluence.

show abstract

Section: Methodsmentioning

confidence: 99%

A Monte Carlo model of the Dingo thermal neutron imaging beamline

Jakubowski,

Chacon,

Tran

et al. 2023

Sci Rep

View full text Add to dashboard Cite

show abstract

“…[17]. In a similar way, a patch including supermirror physics was also created for Geant4 [18]. Alternatively, it has been suggested to use a neutron ray-tracing program, such as McStas [19,20] or VITESS [21,22], to simulate the slow neutron transport in an instrument guide alone and transfer the unreflected neutrons to one of the above mentioned Monte-Carlo codes via specialized tools [23,24,25,26].…”

Section: Introductionmentioning

confidence: 99%

Measurements of the neutron absorption in supermirror coatings

DiJulio,

Santoro,

Devishvili

et al. 2021

Preprint

View full text Add to dashboard Cite

In this work we report on measurements of neutron absorption in supermirror coatings. The measurements were carried out using the SuperADAM instrument at the Institut Laue-Langevin and by measuring the gamma-ray production from m = 3 and m = 4 neutron supermirrors when illuminated by a beam of neutrons. The results provide a valuable validation for recent computational and theoretical work that can be used as input to Monte-Carlo radiation transport calculations for the design of the shielding of neutron scattering instruments.

show abstract