The interaction of the mixing zone between two gases of different
densities with compression waves and shock waves has been investigated.
The characteristics of the mixing zone in which the
Rayleigh–Taylor instability is developing have been analyzed. The
evolution of the mixing zone volume and mass during the accelerated
motion has been defined. A qualitative distinction in the evolution of
the mixing zone under the influence of a continuous deceleration
resulting from the interaction with the reflected compression
wave—shockless deceleration—is revealed as compared to
deceleration that is accompanied by appearance of a shock wave moving
through the mixing zone—shock-induced deceleration.
This paper is devoted to the investigation of powerful
laser pulse interaction with regularly and statistically
volume-structured media with near critical average density
and properties of laser-produced plasma of such a media.
The results of the latest experiments on laser pulse interaction
with plane foam targets performed on Nd-laser facilities
“ABC” in the ENEA-EURATOM Association (Frascati,
Italy) and “MISHEN” in the Troitsk Institute
of Innovation Thermonuclear Investigations (TRINITI, Troitsk
Russia), and J-laser “ISKRA-4” in the Russian
Federal Nuclear Center, All-Russian Scientific Research
Institute of Experimental Physics (RFNC-VNIIEF, Sarov,
Russia) are presented and analyzed. High efficiency of
the internal volume absorption of laser radiation in the
foams of supercritical density was observed, and the dynamics
of absorbing region formation and velocity of energy transfer
process versus the parameters of porous matter
are found. Some inertial confinement fusion (ICF) applications
based on nonequilibrium properties of laser-produced plasma
of a foam and regularly structured media such as the powerful
neutron source with yield of 109–1011
DT-neutrons per 1 J of laser energy, laser-produced X-ray
generation in high temperature supercritical plasma, and
the compact ICF target absorbers providing effective smoothing
and ablation are proposed.
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