Publication

A new transmission based monochromator for energy-selective neutron imaging at the ICON beamline

Steven Luc X Peetermans
2014
Journal Articles

Abstract

A new type of monochromator has been developed for energy-selective neutron imaging at continuous sources. It combines the use of a mechanical neutron velocity selector with pyrolytic graphite crystals of different mosaicity. The beam can be monochromatized to similar levels as a standard double crystal monochromator. It can flexibly produce different desired spectral shapes, even an asymmetric one Intrinsically, no higher order contamination of the spectrum is present. Working with the transmitted beam, the beam divergence (and thus the spatial resolution) is uncompromisecl. The device has been calibrated, characterized and its performance demonstrated with the measurement of Bragg edges for iron and lead, resolving them more sharply than if solely a mechanical velocity selector was used. (C) 2014 Elsevier B.V. All rights reserved

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https://infoscience.epfl.ch/entities/publication/7e0b119b-46d7-4378-9a7f-b2c088e186f9

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Steven Luc X Peetermans
2014
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/7e0b119b-46d7-4378-9a7f-b2c088e186f9

About this result

Related concepts (32)

Gaussian beam

In optics, a Gaussian beam is a beam of electromagnetic radiation with high monochromaticity whose amplitude envelope in the transverse plane is given by a Gaussian function; this also implies a Gaussian intensity (irradiance) profile. This fundamental (or TEM00) transverse Gaussian mode describes the intended output of most (but not all) lasers, as such a beam can be focused into the most concentrated spot. When such a beam is refocused by a lens, the transverse phase dependence is altered; this results in a different Gaussian beam.

Monochromator

A monochromator is an optical device that transmits a mechanically selectable narrow band of wavelengths of light or other radiation chosen from a wider range of wavelengths available at the input. The name is from the Greek roots mono-, "single", and chroma, "colour", and the Latin suffix -ator, denoting an agent. A device that can produce monochromatic light has many uses in science and in optics because many optical characteristics of a material are dependent on wavelength.

Transmission electron microscopy

Transmission electron microscopy (TEM) is a microscopy technique in which a beam of electrons is transmitted through a specimen to form an image. The specimen is most often an ultrathin section less than 100 nm thick or a suspension on a grid. An image is formed from the interaction of the electrons with the sample as the beam is transmitted through the specimen. The image is then magnified and focused onto an imaging device, such as a fluorescent screen, a layer of photographic film, or a sensor such as a scintillator attached to a charge-coupled device.

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A new transmission based monochromator for energy-selective neutron imaging at the ICON beamline

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