Study on s-shaped guide using mcstas software

Oliveira, Luiz Paulo de; Souza, Alexandre Pinho dos Santos; Yokaichiya, Fabiano; Genezini, Frederico A.; Franco, Margareth K. K. D.

doi:10.15392/bjrs.v9i1a.1549

Cited by 2 publications

(3 citation statements)

References 6 publications

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“…An S-shaped neutron guide has been an element of studies recently [12,13,14]. The S geometry was the solution found for the installation of a SANS instrument at the Forschungs-Neutronenquelle Heinz Maier-Leibnitz Laboratory from Munich (FRM-II), which has received instruments from the decommissioning FRJ-2 reactor from Jülich.…”

Section: Introductionmentioning

confidence: 99%

“…Despite S-shaped guides stand firstly for a specific guide arrangement that provides horizontal or vertical displacement from the entrance and exit guide system, the most interesting property of such guide is the wavelength cutoff process [15,14,13]. The appearance of the wavelength cutoff on final flux spectra is not found in any S-shaped guide.…”

Section: Introductionmentioning

confidence: 99%

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Monte Carlo simulations of the S-shaped neutron guides with asymmetric concave and convex surface coatings

Souza,

de Oliveira,

Genezini

2021

Preprint

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During the last decades, neutron beam transportation has been a well-known and established subject for designing proper neutron guides. However, sometimes unusual adaptation or adjustments are required out of original projects and after operation beginning of facilities. Inter-center transferring of instrument locations also requires a new approach that is not necessarily described in the literature. Inside these situations, the use of S-shaped guides has not been fully discussed in the literature.From a geometrical analysis, we develop a formalism of construction of a minimal S-shaped guide by only considering the exclusion of the Line-of-Sight. We study this guide model through the wavelength cutoff and the neutron transport efficiency analysis. Here, Monte Carlo simulations using MC-STAS software are applied. By intending to optimize these guide systems, simulations of this study also consider scenarios that have different supermirrors. A formalism to determine wavelength cutoff for unique and variable index guide systems is also developed.Simulation results show a good agreement between theoretical and simulated wavelength cutoff values. In addition, we have found specific configurations that combine efficient neutron transport and lower index values on the convex surfaces of curved guides that form the S-shaped guide.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Monte Carlo simulations of the S-shaped neutron guides with asymmetric concave and convex surface coatings

Souza,

de Oliveira,

Genezini

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Considering the properties of wavelength cutoff and the geometrical versatility in adapting instruments in real facilities, as described above, the motivation of this study is to investigate neutron transportation through different S-shaped guide configurations by using MCSTAS simulations. In this paper, we study the dependence of wavelength cutoff and S-shaped guide curvature and length, once this cutoff is independent on the initial flux spectrum (facility source) [15]. Moreover, we study the influence of collimator length on the final detected flux divergence as much as the correlation between Mildner cutoff [7] and simulated wavelength cutoff.…”

Section: Introductionmentioning

confidence: 99%

Monte Carlo simulations of the S-shaped neutron guide

Oliveira¹,

Souza²,

Yokaichiya³

et al. 2020

J. Inst.

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A: Neutron transport along guides is governed by the Liouville theorem and the technology involved has advanced in recent decades. Computer simulations have proven to be useful tools in the design and conception of neutron guide systems in facilities. In this study, we use a Monte Carlo method to perform simulations for an S-shaped neutron guide with different dimensions for a Small-Angle Neutron Scattering (SANS) instrument, through the MCSTAS software. A wavelength cutoff is observed and shown to be dependent on the geometrical parameters of the guide. Results for the neutron flux at sample position are presented and a greater sensitivity of cutoffs concerning the curvatures of the guides than to their lengths is noticed. Our results are in agreement with those obtained from the Acceptance Diagram method and we analyze the beam divergence behavior along the S-shaped guide. K: Instrumentation for neutron sources, Neutron sources, Instrument optimization, Simulation methods and programs.

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Study on s-shaped guide using mcstas software

Cited by 2 publications

References 6 publications

Monte Carlo simulations of the S-shaped neutron guides with asymmetric concave and convex surface coatings

Monte Carlo simulations of the S-shaped neutron guides with asymmetric concave and convex surface coatings

Monte Carlo simulations of the S-shaped neutron guide

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