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14Complex Systems of Charged Particles and their Interactions with Electromagnetic Radiation 2018
INVESTIGATION OF THE GENERATION AND ATTENUATION OF SHOCK WAVES GENERATED BY PICOSECOND LASER PULSE IN METALS
S.Yu. Gus'kov2, I.K. Krasyuk12, P.P. Pashinin1, A.Yu Semenov1, I.A. Stuchebrukhov12,
K.V. Khishchenko3, D. Batani4
1 A.M. Prokhorov General Physics Institute of. RAS, Moscow, Russia 2 P.N. Lebedev Physical Institute of RAS, Moscow, Russia 3 Joint Institute for High Temperatures of RAS, Moscow, Russia 4 Centre Lasers Intenses et Applications Université Bordeaux 1, France
The results of experimental and theoretical studies of the shock wave propagation characteristics generated by a 70 ps laser pulse in metals (Al, Pd, Pb, W,Ta, Mo) are presented. Numerical simulation performed using the generated code for schema Courant-Isakson Rice on the basis of equations of hydrodynamics [1], complemented by wide-range semi-empirical equations of state of investigated materials [2]. Hydrodynamic calculations of amplitude attenuation of the the shock wave during its propagation in the target is shown in figure 1. A simple analytical model is proposed, which allows to obtain approximation formulas for approximate calculation of the shock wave characteristics in a solid substance in the pressure range up to 20 TPA. The calculations are supplemented with experimental measurements of the moment of time of the shock wave front exit to the back side of the aluminum target. The experiments were performed on a picosecond laser installation "Kamerton-T" (GPI RAS).
10
TO CL
0 0
û_ 0.01
10
Curves - from top to bottom
1 Ta
2 Pd
3 W
4 Mo
5 Al 2
6 Al 1
7 Pb
-3
0.01 0.1
10
100
10
10
Distance, mkm
Fig. 1. The dynamics of the propagation of the shock wave on the target. The curves show the amplitude of the pressure pulse during its propagation in the target.
Calculations show that, starting from a distance of 2 |im, a shock wave is formed. After that, the attenuation of the shock wave amplitude for all metals is of the power character described by the formula P(x)/P0 = xb. The mean value of the coefficient b for all metals is -
0.735.±0.05.
Acknowledgements: This work was financially supported by the RFBR Grants Nos.16-02-00371, 18-02-00652 and the RAS Presidium program №13 P "Condensed matter and plasma at high energy densities".
1. Kulikovskii A.G., Pogorelov N.V., Semenov A.Yu. Mathematical aspects of numerical solution of hyperbolic systems of equations (CRC Press LLC, Florida, 2001).
2. Lomonosov I.V., Fortov V.E., Khishchenko K.V. Chem. physics, 14 (1), 47 (1995).
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