Effects of Mosaic Crystal Instrument Functions on X-ray Thomson Scattering Diagnostics
arxiv(2024)
摘要
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 mosaic crystals and how the broadening
varies across the spectrometer. Notably, we find a strong asymmetry in the
shape of the IF towards higher energies. As an example, we consider the effect
on the inferred temperature, and find that it 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 modelling and model-free approaches.
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