A compact-rigid multi-analyser for energy and angle filtering of high-resolution X-ray experiments. Part 2. Efficiency of a single-crystal-comb - Archive ouverte HAL
Article Dans Une Revue Journal of Synchrotron Radiation Année : 2023

A compact-rigid multi-analyser for energy and angle filtering of high-resolution X-ray experiments. Part 2. Efficiency of a single-crystal-comb

Jean-Louis Hodeau
Matériaux, Rayonnements, Structure
A. Prat
  • Fonction : Auteur
X'Press : diffraction et hautes pressions
N. Boudet
  • Fonction : Auteur
CRG & Grands instruments
Nils Blanc
CRG & Grands instruments
S. Arnaud
  • Fonction : Auteur
CRG & Grands instruments
Jean-Louis F Hazemann
Matériaux, Rayonnements, Structure
CV
E. Lahéra
  • Fonction : Auteur
Université Grenoble Alpes
O. Proux
  • Fonction : Auteur
Université Grenoble Alpes
M. Jacquet
  • Fonction : Auteur
Laboratoire de l'Accélérateur Linéaire
P.-O. Autran
  • Fonction : Auteur
European Synchrotron Radiation Facility
C. Dejoie
European Synchrotron Radiation Facility
Pauline Martinetto
Matériaux, Rayonnements, Structure

Résumé

Diffraction instruments using filtering by one or several analyser crystals exist since the 1980s and 1990s at synchrotron radiation sources, but, due to its low efficiency, this filtering is little used on laboratory sources. In order to overcome this limitation, the efficiency of a small diffraction filtering multi-analyzer block (MAD block) realized with a `single-crystal-comb' curved on a rigid support is demonstrated here. The geometry of this curved surface is logarithmic spiral and is optimized to allow multi-filtering over a relatively important diffraction angular range and to be also applicable over an X-ray spectral range. The efficiency of such a small rigid-compact MAD block consisting of this single-crystal-comb generating 20–50 Si(111) single-crystal blades, associated with a block of Soller collimators, is demonstrated. The angle between each crystal is 0.1°, so the measurement range of the comb is 2–5°. The geometry of this system has been optimized for operation with a synchrotron X-ray source over an energy range of 22 keV to 46 keV and could be used with laboratory X-ray sources (Ag Kα1, 22.1 keV). This MAD block complements and exploits the qualities of the `photon-counting' detectors which have very low intrinsic noise. Their joint efficacy is supported by powder pattern measurements of a LaB6 reference sample and of several heterogeneous samples of cultural heritage materials, carried out at 22 keV on the D2AM beamline at the ESRF. Their signal-to-noise ratio is excellent (1000/1) and allows the detection thresholds of the measurements (from 3–1% to 0.1%) to detect minor phases in the studies of `real' heterogeneous materials to be drastically improved.

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Instrumentations et Détecteurs [physics.ins-det]
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https://hal.science/hal-03982785

Soumis le : jeudi 25 mai 2023-10:18:56

Dernière modification le : lundi 9 décembre 2024-03:33:10

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hal-03982785 , version 1 (25-05-2023)

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Jean-Louis Hodeau, A. Prat, N. Boudet, Nils Blanc, S. Arnaud, et al.. A compact-rigid multi-analyser for energy and angle filtering of high-resolution X-ray experiments. Part 2. Efficiency of a single-crystal-comb. Journal of Synchrotron Radiation, 2023, 30 (1), pp.126-136. ⟨10.1107/s1600577522011250⟩. ⟨hal-03982785⟩

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