Inertial Fusion Sciences and Applications 2005
J.-C. Gauthier, et al.
J. Phys. IV France 133 (2006) 457-459
DOI: 10.1051/jp4:2006133094

Laser absorption and energy transfer in foams of various pore structures and chemical compositions

J. Limpouch^{1, 2}, N.G. Borisenko³, N.N. Demchenko³, S.Yu. Gus'kov³, A. Kasperczuk⁴, A.M. Khalenkov³, V.N. Kondrashov⁵, E. Krousky², J. Kuba¹, K. Masek², Yu.A. Merkul'ev³, W. Nazarov⁶, P. Pisarczyk⁷, T. Pisarczyk⁴, M. Pfeifer², O. Renner² and V.B. Rozanov<sup>3

1</sup>  Czech Technical University, FNSPE, Brehova 7, 115 19 Prague 1, Czech Republic
²  Institute of Physics, AS CR, Na Slovance 2, 182 21 Prague 8, Czech Republic
³  P.N. Lebedev Physical Institute of RAS, Leninskyi Ave. 53, 117 924 Moscow, Russia
⁴  Institute of Plasma Physics and Laser Microfusion, 23 Hery St., 00-908 Warsaw, Poland
⁵  Troitsk Institute of Innovation and Thermonuclear Research, 142 190 Troitsk, Russia
⁶  University of St. Andrews, School of Chemistry, St. Andrews, Fife KY16 9ST, UK
⁷  Warsaw University of Technology, ICS, 15 Nowowiejska St., Warsaw, Poland

Abstract
Interaction of sub-nanosecond intense laser pulses with foams containing fine and large pores has been studied experimentally. Laser penetration and energy transport in the foam material are measured via streaked side-on x-ray slit images. Shock wave transition through the foam is detected via streaked optical self-emission from foil attached on the foam rear side. The shock transition time increases with the pore size, foam density, and also with the contents of high Z additions in plastic foams. Foil acceleration is observed via 3-frame interferometry. Comparison of experimental results with numerical simulations and an analytical model is underway.

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