Experiments To Assess Preheat In Blast-wave-driven Instability Experiments

Details Experiments To Assess Preheat In Blast-wave-driven Instability Experiments Experiments To Assess Preheat In Blast-wave-driven Instability Experiments

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.0341k&link_type=abstract

American Astronomical Society, AAS Meeting #212, #3.41; Bulletin of the American Astronomical Society, Vol. 40, p.192

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The use of high-energy lasers has become an established means of driving laboratory astrophysical experiments. Such lasers can produce energy densities in sub-millimeter scales that allow one to explore the dynamics that occur in astrophysical systems containing strong shocks, such as supernovae. An experiment by the University of Michigan and collaborators has focused on hydrodynamic instabilities occurring at the H-He interface during a supernovae, by following the development of a scaled target interface. In the initial laser ablation of these targets, however, the laser pulse can interact with the plasma to create some unwanted energetic electrons and photons. This `extra’ energy can in turn heat the material interface ahead of the shock and causes an uncertainty in the initial conditions encountered by the blast wave. Additional experiments have been preformed in order to characterize this `preheat’ in similar target geometries under identical laser conditions. These experiment measured the optical emission and target surface motion ahead of the blast wave. An accurate assessment of preheating is essential to specify a target's pre-shock initial conditions to a high degree of accuracy, in order to better interpret the hydrodynamics experiment.
This research was sponsored by the National Nuclear Security Administration under the Stewardship Science Academic Alliances program through DOE Research Grants DE-FG52-07NA28058, DE-FG52-04NA00064, and other grants and contracts.

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