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Astrophysical radiative shocks: From modeling to laboratory experiments

Published online by Cambridge University Press:  28 November 2006

MATTHIAS GONZÁLEZ ,
CHANTAL STEHLÉ ,
EDOUARD AUDIT ,
MICHEL BUSQUET ,
BEDRICH RUS ,
FRÉDÉRIC THAIS ,
OUALI ACEF ,
PATRICE BARROSO ,
ABRAHAM BAR-SHALOM  and
DANIEL BAUDUIN
...Show all authors
MATTHIAS GONZÁLEZ
Affiliation:
DSM/DAPNIA/Service d'Astrophysique, CEA-Saclay, Gif-sur-Yvette, France
CHANTAL STEHLÉ
Affiliation:
LUTH, UMR811 du CNRS, Observatoire de Paris, Meudon, France
EDOUARD AUDIT
Affiliation:
DSM/DAPNIA/Service d'Astrophysique, CEA-Saclay, Gif-sur-Yvette, France
MICHEL BUSQUET
Affiliation:
LUTH, UMR811 du CNRS, Observatoire de Paris, Meudon, France ARTEP Inc., Columbia, Maryland
BEDRICH RUS
Affiliation:
Institute of Physics, PALS Center, Prague
FRÉDÉRIC THAIS
Affiliation:
DSM/DAPNIA/Service d'Astrophysique, CEA-Saclay, Gif-sur-Yvette, France DSM/DRECAM/SPAM, CEA-Saclay, Gif-sur-Yvette, France
OUALI ACEF
Affiliation:
LUTH, UMR811 du CNRS, Observatoire de Paris, Meudon, France
PATRICE BARROSO
Affiliation:
GEPI, UMR 8111 du CNRS, Observatoire de Paris, Meudon, France
ABRAHAM BAR-SHALOM
Affiliation:
ARTEP Inc., Columbia, Maryland
DANIEL BAUDUIN
Affiliation:
GEPI, UMR 8111 du CNRS, Observatoire de Paris, Meudon, France
MICHAELA KOZLOVÀ
Affiliation:
Institute of Physics, PALS Center, Prague
THIBAUT LERY
Affiliation:
DIAS, Dublin, Ireland
ALI MADOURI
Affiliation:
LPN UPR20, Marcoussis, France
TOMAS MOCEK
Affiliation:
Institute of Physics, PALS Center, Prague
JIRI POLAN
Affiliation:
Institute of Physics, PALS Center, Prague
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Abstract

Radiative shock waves are observed around astronomical objects in a wide variety of environments, for example, they herald the birth of stars and sometimes their death. Such shocks can also be created in the laboratory, for example, by using energetic lasers. In the astronomical case, each observation is unique and almost fixed in time, while shocks produced in the laboratory and by numerical simulations can be reproduced, and investigated in greater detail. The combined study of experimental and computational results, as presented here, becomes a unique and powerful probe to understanding radiative shock physics. Here we show the first experiment on radiative shock performed at the PALS laser facility. The shock is driven by a piston made from plastic and gold in a cell filled with xenon at 0.2 bar. During the first 40 ns of the experiment, we have traced the radiative precursor velocity, that is showing a strong decrease at that stage. Three-dimensional (3D) numerical simulations, including state-of-art opacities, seem to indicate that the slowing down of the precursor is consistent with a radiative loss, induced by a transmission coefficient of about 60% at the walls of the cell. We infer that such 3D radiative effects are governed by the lateral extension of the shock wave, by the value of the opacity, and by the reflection on the walls. Further investigations will be required to quantify the relative importance of each component on the shock properties.

Keywords

Laboratory astrophysicsLaser plasmasRadiative shock wavesRadiative transfer
Type
Research Article
Information
Laser and Particle Beams , Volume 24 , Issue 4 , October 2006 , pp. 535 - 540
Copyright
© 2006 Cambridge University Press

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