Effects of mosaic crystal instrument functions on x-ray Thomson scattering diagnostics

Mosaic crystals, with their high integrated reflectivities, are widely employed in spectrometers used to diagnose high energy density systems. X-ray Thomson scattering (XRTS) has emerged as a powerful diagnostic tool of these systems, providing in principle direct access to important properties such as the temperature via detailed balance. However, the measured XRTS spectrum is broadened by the spectrometer instrument function (IF), and without careful consideration of the IF one risks misdiagnosing system conditions. Here, we consider in detail the IF of 40 and 100 μm mosaic Highly Annealed Pyrolytic Graphite crystals, and how the broadening varies across the spectrometer in an energy range of 6.7–8.6 keV. Notably, we find a strong asymmetry in the shape of the IF toward higher energies. As an example, we consider the effect of the asymmetry in the IF on the temperature inferred via XRTS for simulated 80 eV CH plasmas and find that the temperature can be overestimated if an approximate symmetric IF is used. We, therefore, expect a detailed consideration of the full IF will have an important impact on system properties inferred via XRTS in both forward modeling and model-free approaches.

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Publication Details

Journal
Journal of Applied Physics
Published
2024-09-09
DOI
https://doi.org/10.1063/5.0222072
Citations
12
Primary Topic
X-ray Spectroscopy and Fluorescence Analysis
Type
article
Field-Weighted Citation Impact
7.29

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article

Effects of mosaic crystal instrument functions on x-ray Thomson scattering diagnostics

N. J. Hartley, J. Lütgert, Mikhail Mishchenko, L. B. Fletcher et al.
12 citations
Journal of Applied Physics
X-ray Spectroscopy and Fluorescence Analysis
7.29
article

Effects of mosaic crystal instrument functions on x-ray Thomson scattering diagnostics

N. J. Hartley, J. Lütgert, Mikhail Mishchenko, L. B. Fletcher, Jan Vorberger, T. Toncian, Tobias Dornheim, Zuzana Konôpková, Alejandro Laso García, Hauke Höppner, W. J. Martin, M. Nakatsutsumi, Mikako Makita, P. Neumayer, Thomas R. Preston, Karen Appel, Attila Cangi, Adrien Descamps, Lisa Randolph, M. J. MacDonald, Sebastian Goede, Carsten Baehtz, Oliver Humphries, D. Kraus, V. Bouffetier, L. Wollenweber, E. Brambrink, Björn Lindqvist, U. Zastrau, Zhandos A. Moldabekov, A. Pełka, D. B. Brown, Thomas Gawne, Chongbing Qu, P. Hesselbach, J. Rips, Hannah M. Bellenbaum, Jean-Paul Naedler, M. Herbert
article en
12 citations

Abstract

Mosaic crystals, with their high integrated reflectivities, are widely employed in spectrometers used to diagnose high energy density systems. X-ray Thomson scattering (XRTS) has emerged as a powerful diagnostic tool of these systems, providing in principle direct access to important properties such as the temperature via detailed balance. However, the measured XRTS spectrum is broadened by the spectrometer instrument function (IF), and without careful consideration of the IF one risks misdiagnosing system conditions. Here, we consider in detail the IF of 40 and 100 μm mosaic Highly Annealed Pyrolytic Graphite crystals, and how the broadening varies across the spectrometer in an energy range of 6.7–8.6 keV. Notably, we find a strong asymmetry in the shape of the IF toward higher energies. As an example, we consider the effect of the asymmetry in the IF on the temperature inferred via XRTS for simulated 80 eV CH plasmas and find that the temperature can be overestimated if an approximate symmetric IF is used. We, therefore, expect a detailed consideration of the full IF will have an important impact on system properties inferred via XRTS in both forward modeling and model-free approaches.

Journal of Applied PhysicsVol. 136(10)
Goethe University Frankfurt (DE), Queen's University Belfast (GB), Lawrence Livermore National Laboratory (US), GSI Helmholtz Centre for Heavy Ion Research (DE), Helmholtz-Zentrum Dresden-Rossendorf (DE), SLAC National Accelerator Laboratory (US), Center for Advanced Systems Understanding (DE), University of Rostock (DE), European X-Ray Free-Electron Laser (DE)
European Commission, Bundesministerium für Bildung und Forschung
Affordable and clean energy
Openalex Percentile: Top 2%
X-ray Spectroscopy and Fluorescence Analysis
7.29
DOIOpen Access PDFOpenAlex
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