The ICON beamline – A facility for cold neutron imaging at SINQ

Kaestner, Anders; Hartmann, Stefan; Kühne, G.; Frei, G.; Grünzweig, C.; Josic, L.; Schmid, Florian; Lehmann, Eberhard

doi:10.1016/j.nima.2011.08.022

Cited by 249 publications

(176 citation statements)

References 20 publications

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“…[12] The sample stage used for this experiment consists of a motorized positioning system and a turn-table allowing the tomographic imaging in the range of 360 deg. A detector system based on a combination of a scintillator screen and a CCD-camera was applied to acquire the images for tomography.…”

Section: B Characterizationmentioning

confidence: 99%

Observations on the Zirconium Hydride Precipitation and Distribution in Zircaloy-4

Wang

Garbe

et al. 2013

Metall Mater Trans B

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Hydride precipitation and distribution in hot-rolled and annealed Zircaloy-4 plate samples artificially induced by gaseous hydrogen charging were studied primarily by neutron tomography, scanning electron microscopy (SEM), and SEM-based electron backscattered diffraction techniques. The precipitated hydride platelet (δ-ZrH1.66) at a hydrogen pressure of 20 atm was found following the {111}δ-ZrH1.66//(0001) α-Zr with the surrounding α-Zr matrix. The microstructural characterization indicated that hydrides with a relatively uniform distribution were precipitated on the rolling-transverse section of the plate, whereas, on the normaltransverse section, a hydride concentration gradient was present with a dense hydride layer near the surface. Further, the neutron tomography investigations clearly identified the nonuniform spatial distribution of hydrides. Thin hydride layers preferentially formed on the sample surface, and the concentrated hydrides precipitating at the edges/corner of the sample were observed. The causes for the localized hydride accumulation were also discussed. Disciplines Engineering | Science and Technology Studies Publication DetailsWang, Z., Garbe, U., Li, H., Harrison, R. P., Kaestner, A. & Lehmann, E. (2014 Hydride precipitation and distribution in hot-rolled and annealed Zircaloy-4 plate samples artificially induced by gaseous hydrogen charging were studied primarily by neutron tomography, scanning electron microscopy (SEM), and SEM-based electron backscattered diffraction techniques. The precipitated hydride platelet (d-ZrH 1.66 ) at a hydrogen pressure of 20 atm was found following the {111} d-ZrH1.66 //(0001) a-Zr with the surrounding a-Zr matrix. The microstructural characterization indicated that hydrides with a relatively uniform distribution were precipitated on the rolling-transverse section of the plate, whereas, on the normal-transverse section, a hydride concentration gradient was present with a dense hydride layer near the surface. Further, the neutron tomography investigations clearly identified the nonuniform spatial distribution of hydrides. Thin hydride layers preferentially formed on the sample surface, and the concentrated hydrides precipitating at the edges/ corner of the sample were observed. The causes for the localized hydride accumulation were also discussed.

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Section: B Characterizationmentioning

confidence: 99%

Observations on the Zirconium Hydride Precipitation and Distribution in Zircaloy-4

Wang

Garbe

et al. 2013

Metall Mater Trans B

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“…Two different experimental set-ups were tested; the Imaging with Cold Neutrons (ICON) beamline [26] at Swiss Spallation Neutron Source (SINQ) at the Paul Scherrer Institut (Switzerland) and the DINGO beamline [27,28] at the Australian Nuclear Science and Technology Organisation (ANSTO, Lucas Heights, Australia). Details regarding the beamlines' properties and set-ups are reported below.…”

Section: Methodsmentioning

confidence: 99%

Structural Characterization of Iron Meteorites through Neutron Tomography

et al. 2016

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Abstract:In this communication, we demonstrate the use of neutron tomography for the structural characterization of iron meteorites. These materials prevalently consist of metallic iron with variable nickel content. Their study and classification is traditionally based on chemical and structural analysis. The latter requires cutting, polishing and chemical etching of large slabs of the sample in order to determine the average width of the largest kamacite lamellae. Although this approach is useful to infer the genetical history of these meteorites, it is not applicable to small or precious samples. On the base of different attenuation coefficient of cold neutrons for nickel and iron, neutron tomography allows the reconstruction of the Ni-rich (taenite) and Ni-poor (kamacite) metallic phases. Therefore, the measure of the average width of the largest kamacite lamellae could be determined in a non-destructive way. Furthermore, the size, shape, and spatial correlation between kamacite and taenite crystals were obtained more efficiently and accurately than via metallographic investigation.

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“…Las estaciones de radiografía de neutrones en las que se realizaron los experimentos sobre las muestra homogéneas son: (i) ANTARES [3,4] del reactor FRM-II en Alemania, (ii) BOA [5] de la fuente SINQ en Suiza, (iii) Engin-X [6] de la fuente Isis en el Reino Unido, y (iv) el instrumento de neutrografía del reactor RA-6 [7] en Argentina. Estas facilidades tienen características diferentes en cuanto a la forma de producción y la intensidad de fuente de neutrones, el material moderador de donde emergen los neutrones, el tamaño D de la fuente efectiva de neutrones (diámetro del pinhole), la distancia L a la que el detector se encuentra del mismo, el flujo incidente sobre la muestra, y sistema de detección (material sensible a neutrones, resolución espacial).…”

Section: Instrumentos Utilizadosunclassified

Determinación de bajas concentraciones de hidrógeno en aleaciones de circonio utilizando radiografía de neutrones como técnica no destructiva

et al. 2018

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RESUMEN Las aleaciones base circonio (Zr) se utilizan en la fabricación de las vainas de combustible y en componentes estructurales de los reactores de potencia por su baja absorción neutrónica. Estas aleaciones son susceptibles al daño por hidrógeno (H), debido a que la concentración del mismo puede incrementarse localmente en respuesta a gradientes de temperaturas o tensiones. Esto provoca una degradación general de sus propiedades mecánicas, y puede generar un proceso lento de degradación conocido como rotura diferida inducida por hidruros (Delayed Hydride Cracking – DHC). El contenido de H en aleaciones de circonio es generalmente determinado mediante técnicas destructivas. En este trabajo determinamos el contenido de H en el rango 0-300 wt ppm con una sensibilidad de ~5 wt ppm y una resolución espacial de ~0.1 mm utilizando la radiografía de neutrones (neutrografía) como técnica no destructiva. A fin de comparar la capacidad de distintas facilidades de neutrografía para este tipo de análisis, los estudios se realizaron en cuatro laboratorios con características diferentes en términos del flujo y de la distribución en energía de los neutrones incidentes sobre la muestra, así como la máxima resolución espacial disponible en cada caso (parámetro L/D). Las facilidades fueron ANTARES en el reactor FRM-II (Alemania), Engin-X en la fuente pulsada ISIS (Reino Unido), BOA en la fuente de espalación SINQ (Suiza), y la facilidad de neutrografía del reactor RA-6 de Bariloche (Argentina). La resolución espacial alcanzada permite determinar el coeficiente de difusión de H en aleaciones de Zr utilizando muestras de dimensiones aproximadas de 5x10x10 mm3.

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The ICON beamline – A facility for cold neutron imaging at SINQ

Cited by 249 publications

References 20 publications

Observations on the Zirconium Hydride Precipitation and Distribution in Zircaloy-4

Observations on the Zirconium Hydride Precipitation and Distribution in Zircaloy-4

Structural Characterization of Iron Meteorites through Neutron Tomography

Determinación de bajas concentraciones de hidrógeno en aleaciones de circonio utilizando radiografía de neutrones como técnica no destructiva

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