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Effect of radiation on the time-resolved rear-side emission of laser-illuminated foils at 0.25 μm: Comparison with simulations

Published online by Cambridge University Press:  09 March 2009

R. Benattar ,
V. Malka ,
J. Meyer-Ter-Vehn  and
M. Murakami
R. Benattar
Affiliation:
Luli, Unité mixte de Recherche CNRS-Ecole Polytechnique, Ecole Polytechnique 91128 Palaiseau, France
V. Malka
Affiliation:
Luli, Unité mixte de Recherche CNRS-Ecole Polytechnique, Ecole Polytechnique 91128 Palaiseau, France
J. Meyer-Ter-Vehn
Affiliation:
Max-Planck-lnstitut für Quantenoptik, D-8046 Garching, Germany
M. Murakami
Affiliation:
Max-Planck-lnstitut für Quantenoptik, D-8046 Garching, Germany
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Abstract

Experiments were performed at Ecole Polytechnique in order to study the effect of preheating of targets by X rays during interaction with a powerful 4ω laser. Thin aluminum foils (typically of 5–15-μm thickness) are used as targets. The emission at 40 and 80 eV is recorded by Schwarzchild microscopes and is time resolved. By assuming a blackbody emission of the rear side of the foil just at the beginning of the emission, we deduce the temperature, by measuring the ratio of the emissivity at the two wavelengths. Experimental results are presented for an energy varying between 10 and 30 J delivered at the fourth harmonic of the neodymium laser in a pulse of 0.5-ns time duration focused in a 100-μm-diameter focal spot. Simulations performed with the code MULTI including radiative transfer are presented in order to show the effect of radiation on the process of heating of the target material. Radiation spectra emitted from the laser side and the rear side, as well as the temperature and density evolution as a function of time and mass coordinate, are shown.

Type
Research Article
Information
Laser and Particle Beams , Volume 9 , Issue 2 , June 1991 , pp. 541 - 549
Copyright
Copyright © Cambridge University Press 1991

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References

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