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X-ray back-lighter characterization for iron opacity measurements using laser-produced aluminium K-alpha emission

Rossall, A. K., Gartside, L. M. R., Chaurasia, S., Tripathi, S., Munda, D. S., Gupta, N. K., Dhareshwar, L. J., Gaffney, J., Rose, S. J. and Tallents, G. J. (2010) X-ray back-lighter characterization for iron opacity measurements using laser-produced aluminium K-alpha emission. Journal of Physics B: Atomic, Molecular and Optical Physics, 43 (15). p. 155403. ISSN 0953-4075

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Abstract

Aluminium Kα emission (1.5 keV) produced by an 8 J, 500 ps, Nd:glass laser incident at 45° onto a layered target of 0.8 µm thick aluminium (front side) and 1 µm thick iron (backside) has been used to probe the opacity of iron plasma. Source broadened spectroscopy and continuum emission analysis show that whole beam self-focusing within the aluminium plasma results in a two-temperature spatial distribution. Thermal conduction from the laser-irradiated aluminium into the iron layer, enhanced by the whole beam self-focusing, results in a temperature of ~10–150 eV in the iron layer. The iron opacity at a photon energy of 1.5 keV is shown to be strongly modified from cold values in agreement with IMP code opacities. Results presented here represent a feasibility study to seed future work using table-top laser systems for plasma opacity experiments.

Item Type: Article
Subjects: Q Science > QC Physics
Schools: School of Computing and Engineering
Related URLs:
Depositing User: Andrew Rossall
Date Deposited: 13 Apr 2016 12:01
Last Modified: 13 Apr 2016 12:01
URI: http://eprints.hud.ac.uk/id/eprint/26826

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