Physics – Plasma Physics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aps..dppgm1007r&link_type=abstract
American Physical Society, 45th Annual Meeting of the Division of Plasma Physics, October 27-31, 2003, Albuquerque, New Mexico,
Physics
Plasma Physics
Scientific paper
A strong shock produces a fixed increase in density, after which the density can increase further by radiative cooling, which removes internal energy but does not affect the pressure of the post-shock layer. The shocked layer in turn becomes much thinner, and can be said to have collapsed. Such collapsing shocks are common in astrophysics. A few experiments have had the goal of producing shocks that are fast enough that the thermal radiation from the shocked material either produces a substantial precursor or causes collapse. After some discussion of the astrophysical context, the conditions for collapse, and prior experiments, this talk will discuss in more detail a specific experiment in which the Omega laser drives a thin slab of material at >100 km/s through xenon gas at 6 mg/cc. 1D simulations predict a collapsed layer. X-ray radiography has detected the presence of a dense shocked layer with velocity >100 km/s, compressed to <1/15 its initial thickness. A unique, side-on application of a VISAR diagnostic has detected reflections from the layer. Supported by the U.S. DoE under grants DE-FG03-99DP00284, DE-FG03-00SF22021, and other grants and contracts.
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