Journal Article PUBDB-2026-00244

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X-ray thermal diffuse scattering as a texture-robust temperature diagnostic for dynamically compressed solids

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2025
American Inst. of Physics Melville, NY

Journal of applied physics 138(15), 155903 () [10.1063/5.0295250]
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Abstract: We present a model of x-ray thermal diffuse scattering (TDS) from a cubic polycrystal with an arbitrary crystallographic texture, based on the classic approach of Warren [B. E. Warren, Acta Crystallogr. 6, 803 (1953)]. We compare the predictions of our model with femtosecond x-ray diffraction patterns gathered from ambient and dynamically compressed rolled copper foils obtained at the High Energy Density instrument of the European X-Ray Free-Electron Laser facility and find that the texture-aware TDS model yields more accurate results than does the conventional powder model owed to Warren. Nevertheless, we further show: with sufficient angular detector coverage, the TDS signal is largely unchanged by sample orientation and in all cases strongly resembles the signal from a perfectly random powder; shot-to-shot fluctuations in the TDS signal resulting from grain-sampling statistics are at the percent level, in stark contrast to the fluctuations in the Bragg-peak intensities (which are over an order of magnitude greater); and TDS is largely unchanged even following texture evolution caused by compression-induced plastic deformation. We conclude that TDS is robust against texture variation, making it a flexible temperature diagnostic applicable just as well to off-the-shelf commercial foils as to ideal powders.

Classification:

Contributing Institute(s):
  1. DOOR-User (DOOR ; HAS-User)
  2. PETRA-D (FS-PETRA-D)
  3. HED (XFEL_E1_HED)
Research Program(s):
  1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)
  2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
  3. DFG project 505630685 - Untersuchung planetarer Eise mit Kompressionsexperimenten (505630685) (505630685)
Experiment(s):
  1. PETRA Beamline P02.2 (PETRA III)

Appears in the scientific report 2025
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 Record created 2026-01-13, last modified 2026-02-09


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