Modeling of laser-driven water-confined shocks into porous graphite

18th APS-SCCM; 24th AIRAPT

Seisson, G.^1 ; Hébert, D.^1 ; Bertron, I.^1 ; Videau, L.^2 ; Combis, P.^2 ; Berthe, L.^3 ; Boustie, M.^4

CEA CESTA, CS60001, Le-Barp-Cedex

33116, France^1

CEA DIF, Arpajon

91297, France^2

Laboratoire PIMM UPR8006, 151 bd de l'Hôpital, Paris

75013, France^3

Institut p' UPR3346, 1 av Clément Ader, Futuroscope-Cedex

86961, France^4

关键词: Commercial grade;    Compaction curves;    Continuous materials;    Free surface velocity;    Laser experiments;    Laser-matter interactions;    Surface velocity;    Velocity interferometer systems;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/500/11/112057/pdf
DOI  :  10.1088/1742-6596/500/11/112057

来源: IOP

【 摘 要 】

This paper presents a laser-driven water-confined shock experiment into a commercial grade of porous graphite. An intensity of about 3 GW/cm2led to a pressure above 2 GPa on the front surface of the 0.46 mm sample. The rear surface velocity, recorded by a Velocity Interferometer System (VISAR), reached 325 m/s. Two classical models for porous materials are discussed. The first one uses plates of dense graphite spaced out in order to obtain the correct average density. The second one models a continuous material and includes an experimental compaction curve of our porous graphite. They were implemented into hydrocodes and both gave quite correct maximum free surface velocities and shock break-out instants. Nevertheless, the continuous representation appeared to be more efficient to reproduce the experimental free surface velocity ramp. Discussions on the laser-matter interaction modeling are also provided. Finally, a protocol for the simulation of future laser experiments is proposed.