Physics – Plasma Physics
Scientific paper
Nov 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aps..dpp.co217f&link_type=abstract
American Physical Society, 41st Annual Meeting of the Division of Plasma Physics, November 15-19, 1999 Seattle, WA, abstract #CO
Physics
Plasma Physics
Scientific paper
Supersonic fluid flow and the interactions of strong shock waves are common features of ICF and astrophysical science. We describe experiments, carried out at the Nova and Omega lasers, to investigate the formation of supersonic jets of material and their interaction with an ambient medium. The target assembly consists of a cylindrical aluminium or titanium pin, partly protruding from a one side of a surrounding gold washer. Ablation of the exposed end and side surfaces of the pin, by radiation from a laser-heated hohlraum, results in the propagation of shocks whose interaction within the pin gives rise to a supersonic jet of material ejected from its outer (not driven) end. An appropriate choice of dimensions for the pin and washer results in a well-collimated, high Mach-number jet which propagates into a polystyrene block adjacent to the end of the pin. The density distribution within the jet, the resulting bow shock in the plastic block, and the Kelvin-Helmholz roll-up of the tip of the jet, are diagnosed by x-ray backlighting. The experimental data are compared with the results of 2-D simulations using AWE, LANL, and LLNL hydrocodes.
Fell M.
Foster John M.
Perry Theodore S.
Rosen Paul A.
Wilde Bernhard H.
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