Characterization of suprathermal electrons inside a laser accelerated plasma via highly-resolved K⍺-emission

M. Šmíd (), O. Renner, A. Colaitis, V. T. Tikhonchuk, T. Schlegel and F. B. Rosmej ()
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M. Šmíd: Helmholtz-Zentrum Dresden-Rossendorf
O. Renner: Institute of Physics of the Czech Academy of Sciences
A. Colaitis: Centre Lasers Intenses et Applications, University of Bordeaux - CNRS - CEA
V. T. Tikhonchuk: ELI Beamlines, Institute of Physics of the Czech Academy of Sciences
T. Schlegel: ELI Beamlines, Institute of Physics of the Czech Academy of Sciences
F. B. Rosmej: Sorbonne Université, Faculté des Sciences et Ingénierie

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Suprathermal electrons are routinely generated in high-intensity laser produced plasmas via instabilities driven by non-linear laser-plasma interaction. Their accurate characterization is crucial for the performance of inertial confinement fusion as well as for performing experiments in laboratory astrophysics and in general high-energy-density physics. Here, we present studies of non-thermal atomic states excited by suprathermal electrons in kJ-ns-laser produced plasmas. Highly spatially and spectrally resolved X-ray emission from the laser-deflected part of the warm dense Cu foil visualized the hot electrons. A multi-scale two-dimensional hydrodynamic simulation including non-linear laser-plasma interactions and hot electron propagation has provided an input for ab initio non-thermal atomic simulations. The analysis revealed a significant delay between the maximum of laser pulse and presence of suprathermal electrons. Agreement between spectroscopic signatures and simulations demonstrates that combination of advanced high-resolution X-ray spectroscopy and non-thermal atomic physics offers a promising method to characterize suprathermal electrons inside the solid density matter.

Date: 2019
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DOI: 10.1038/s41467-019-12008-9

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