Advantages and limitations of nuclear physics experiments at an ISIS-class spallation neutron source

Mocko, M.; Muhrer, G.; Tôvesson, F.

doi:10.1016/j.nima.2008.02.100

Cited by 19 publications

(11 citation statements)

References 12 publications

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“…Remote density measurements utilizing neutron radiography were performed on Flight Path 5 (FP-5) at the Lujan Neutron Scattering Center, which is one of two spallation neutron sources at the Los Alamos Neutron Science Center (LANSCE, Los Alamos, NM, USA) [ 21 , 22 ]. Located on the lower tier of the Lujan Target-Moderator-Reflector-Shield (TMRS) systems [ 23 ], FP-5 observes moderated neutrons from a room temperature high intensity water moderator, with energies ranging from approximately thermal to epithermal (0.25 meV to 10 keV) [ 24 ].…”

Section: Setup and Methodsmentioning

confidence: 99%

Remote Density Measurements of Molten Salts via Neutron Radiography

et al. 2021

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With an increased interest in the use of molten salts in both nuclear and non-nuclear systems, measuring important thermophysical properties of specific salt mixtures becomes critical in understanding salt performance and behavior. One of the more basic and significant thermophysical properties of a given salt system is density as a function of temperature. With this in mind, this work aims to present and layout a novel approach to measuring densities of molten salt systems using neutron radiography. This work was performed on Flight Path 5 at the Los Alamos Neutron Science Center at Los Alamos National Laboratory. In order to benchmark this initial work, three salt mixtures were measured, NaCl, LiCl (58.2 mol%) + KCl (41.8 mol%), and MgCl2 (32 mol%) + KCl (68 mol%). Resulting densities as a function of temperature for each sample from this work were then compared to previous works employing traditional techniques. Results from this work match well with previous literature values for all salt mixtures measured, establishing that neutron radiography is a viable technique to measure density as a function of temperature in molten salt systems. Finally, advantages of using neutron radiography over other methods are discussed and future work in improving this technique is covered.

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Section: Setup and Methodsmentioning

confidence: 99%

Remote Density Measurements of Molten Salts via Neutron Radiography

et al. 2021

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“…Imaging measurements described in this report were performed using Flight Path 5 (FP5) at the Lujan Neutron Scattering Center (for a description see M. Mocko et al [31]). The spallation neutron pulses are created by 270 ns long 800 MeV H+ pulses impinging on a tungsten target.…”

Section: Methodsmentioning

confidence: 99%

Event Centroiding Applied to Energy-Resolved Neutron Imaging at LANSCE

2018

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Abstract:The energy-dependence of the neutron cross section provides vastly different contrast mechanisms than polychromatic neutron radiography if neutron energies can be selected for imaging applications. In recent years, energy-resolved neutron imaging (ERNI) with epi-thermal neutrons, utilizing neutron absorption resonances for contrast as well as for quantitative density measurements, was pioneered at the Flight Path 5 beam line at LANSCE and continues to be refined. Here we present event centroiding, i.e., the determination of the center-of-gravity of a detection event on an imaging detector to allow sub-pixel spatial resolution and apply it to the many frames collected for energy-resolved neutron imaging at a pulsed neutron source. While event centroiding was demonstrated at thermal neutron sources, it has not been applied to energy-resolved neutron imaging, where the energy resolution requires to be preserved, and we present a quantification of the possible resolution as a function of neutron energy. For the 55 µm pixel size of the detector used for this study, we found a resolution improvement from~80 µm to~22 µm using pixel centroiding while fully preserving the energy resolution.

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“…The collimator consists of four sections with a total length of 3 m. A detailed description of the neutron facility at the Lujan Center and the properties of the beam can be found in Refs. [19,20].…”

Section: Methodsmentioning

confidence: 99%