Measurements of the K-shell opacity of a solid-density magnesium plasma heated by an X-ray free electron laser

Measurements of the K-shell opacity of a solid-density magnesium plasma heated by an X-ray free electron laser

We present measurements of the spectrally-resolved X-rays emitted from solid-density magnesium targets of varying sub-μm thicknesses isochorically heated by an X-ray laser. The data exhibit a largely thickness-independent source function, allowing the extraction of a measure of the opacity to K-shel...

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Bibliographic Details
Main Authors: Preston, T, Vinko, S, Ciricosta, O, Hollebon, P, Chung, H, Dakovski, G, Krzywinski, J, Minitti, M, Burian, T, Chalupský, J, Hájková, V, Juha, L, Vozda, V, Zastrau, U, Lee, R, Wark, J
Format: Journal article
Published: American Physical Society 2017
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Summary:We present measurements of the spectrally-resolved X-rays emitted from solid-density magnesium targets of varying sub-μm thicknesses isochorically heated by an X-ray laser. The data exhibit a largely thickness-independent source function, allowing the extraction of a measure of the opacity to K-shell X-rays within well-defined regimes of electron density and temperature, extremely close to local thermodynamic equilibrium (LTE) conditions. The deduced opacities at the peak of the K-α transitions of the ions are consistent with those predicted by detailed atomic-kinetics calculations.

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