Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005ap%26ss.298..287m&link_type=abstract
Astrophysics and Space Science, Volume 298, Issue 1-2, pp. 287-291
Astronomy and Astrophysics
Astrophysics
1
Laser-Cluster Interactions, Laser-Driven Shocks And Discontinuities, Hydrodynamic And Radiative Plasma Instabilities
Scientific paper
We report on the first production of “tailored” blast waves in cluster media using a 1 ps laser pulse focused to 2×1016 W/cm2. This new technique allows cylindrical blast waves to be produced with a strong axial modulation of variable spatial frequency, as a seed for instability growth. Energy deposition is modified by changing the cluster density whilst keeping the atomic density of the target constant. Electron density maps show the production of strongly modulated blast waves and the development of a thin shell structure in H at late times, and the trajectories show blast waves forming in H, and Ar. In Xe, a blast wave does not form on the timescales studied. Analysis of astrophysical similarity parameters suggests that a hydrodynamically similar situation is created in H, and that further evolution would create a regime where radiative effects may be influential in Ar and Xe.
Moore Alastair S.
Smith Robert A.
Symes Daniel R.
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