Physics
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..dppgp1061k&link_type=abstract
American Physical Society, 44th Annual Meeting of the Division of Plasma , abstract #GP1.061
Physics
Scientific paper
Many astrophysical systems, such as supernova remnants and jets, produce radiative-precursor shock waves. In a radiative-precursor shock, radiation from the shock ionizes and heats the medium ahead of it. An important goal of this effort is to produce an experiment that can be modeled by an astrophysical code without implementing laser absorption physics into it. In this experiment, the laser-irradiation conditions are chosen so that the driven shock will produce an observable radiative precursor. We observe the radiative precursor by using absorption spectroscopy. These observations allow us to determine the temperature profile in the precursor. The length and temperature of the radiative precursor are observed to vary as the laser irradiance, and hence shock velocity, is varied. These measurements indicate there is a minimum shock velocity to produce a radiative precursor. Work supported by the U.S. Department of Energy both directly and through the Lawrence Livermore National Laboratory
Drake Paul R.
Keiter Paul
Knauer Jim
Perry Theodore S.
Remington Bruce A.
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