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

A. K. Rossall, L. M.R. Gartside, S. Chaurasia, S. Tripathi, D. S. Munda, N. K. Gupta, L. J. Dhareshwar, J. Gaffney, S. J. Rose, G. J. Tallents

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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.

Original languageEnglish
Article number155403
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Volume43
Issue number15
DOIs
Publication statusPublished - 20 Jul 2010
Externally publishedYes

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