Formation of a shock wave in aerogel irradiated with a high-current pulsed electron beam |
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Authors: | B A Demidov V P Efremov M V Ivkin I A Ivonin V A Petrov V E Fortov |
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Institution: | (1) Kurchatov Institute Russian Science Center, 123182 Moscow, Russia |
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Abstract: | The propagation of pressure jumps excited by a high-current pulsed electron beam in SiO2 aerogels with density ranging from 0.025 to 0.25 g/cm3 is investigated using a laser differential interferometer and optical methods. Spallation on the back side of the aerogel
targets is observed and the velocity of the spallation fragments is measured. The expansion velocity of the aerogel in the
direction of the electron beam is determined. The parameters of the shock adiabat are established in a wide range of aerogel
porosities. The depth of the energy-deposition zone of the electron beam is determined experimentally as a function of the
aerogel density in the range from 0.015 to 0.25 g/cm3. A model describing highly porous materials which reflects the fractal properties of highly porous aerogels is developed
on the basis of the experimental data. Numerical calculations of the observed phenomena are performed.
Zh. Tekh. Fiz. 69, 18–25 (December 1999) |
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