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Energy transport in short-pulse-laser-heated targets measured using extreme ultraviolet laser backlighting

L. A. Wilson1,*, G. J. Tallents1, J. Pasley1, D. S. Whittaker1, S. J. Rose2, O. Guilbaud3, K. Cassou3, S. Kazamias3, S. Daboussi3 et al.

M. Pittman3, O. Delmas3, J. Demailly3, O. Neveu3, and D. Ros3

  • 1York Plasma Institute, The Department of Physics, The University of York, York YO10 5DQ, UK
  • 2Imperial College London, South Kensington Campus, London SW7 2AZ, UK
  • 3LASERIX, Université Paris-Sud, Campus de l'ENSTA, Chemin de la Hunière, F-91761 PALAISEAU Cedex, France.

  • *law504@york.ac.uk
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Phys. Rev. E 86, 026406 – Published 28 August, 2012

DOI: https://doi.org/10.1103/PhysRevE.86.026406

Abstract

The accurate characterization of thermal electron transport and the determination of heating by suprathermal electrons in laser driven solid targets are both issues of great importance to the current experiments being performed at the National Ignition Facility, which aims to achieve thermonuclear fusion ignition using lasers. Ionization, induced by electronic heat conduction, can cause the opacity of a material to drop significantly once bound-free photoionization is no longer energetically possible. We show that this drop in opacity enables measurements of the transmission of extreme ultraviolet (EUV) laser pulses at 13.9 nm to act as a signature of the heating of thin (50 nm) iron layers with a 50-nm thick parylene-N (CH) overlay irradiated by 35-fs pulses at irradiance 3×1016 Wcm−2. Comparing EUV transmission measurements at different times after irradiation to fluid code simulations shows that the target is instantaneously heated by hot electrons (with approximately 10% of the laser energy), followed by thermal conduction with a flux limiter of ≈0.05.

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Phys. Rev. E 86, 026406– Published 28 August, 2012
  • Received 13 December 2011

©2012 American Physical Society

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