X-ray absorption spectroscopy study of energy transport in foil targets heated by PW laser pulses

Skobelev, I. Yu. and Ryazantsev, S. N. and Arich, D. D. and Bratchenko, P. S. and Faenov, A. Ya. and Pikuz, T. A. and Durey, P. and Doehl, L. and Farley, D. and Baird, C. and Lancaster, K. and Murphy, C. and Booth, N. and Spindloe, C. and McKenna, P. and Hansen, S. B. and Colgan, J. and Kodama, R. and Woolsey, N. and Pikuz, S. A. (2018) X-ray absorption spectroscopy study of energy transport in foil targets heated by PW laser pulses. Photonics Research, 6 (4). pp. 234-237. ISSN 2327-9125 (https://doi.org/10.1364/PRJ.6.000234)

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Abstract

Absorption x-ray spectroscopy is proposed as a method for studying the heating of a solid-density matter excited by secondary xray radiation from a relativistic laser-produced plasma. The method was developed and applied to experiments involving thin silicon foils irradiated by 0.5–1.5 ps duration ultrahigh contrast laser pulses at intensities between 0.5×1020 and 2.5×1020 W/cm2 . The electron temperature of the material at the rear side of a target is estimated to be in the range of 140–300 eV. The diagnostic approach enables the diagnosis of warm dense matter states with low self-emissivity.

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