Physics – Plasma Physics
Scientific paper
Nov 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aps..dpp..3e14s&link_type=abstract
American Physical Society, Division of Plasma Physics Meeting, November 10-15, 1996, abstract #3E.14
Physics
Plasma Physics
Scientific paper
The radiation field from a laser-heated hohlraum can drive a supersonic Marshak wave through low-density material such as a foam buffer placed between the radiation source and the foil sample. When the radiation wavefront arrives at the foil/foam interface, pressure is applied to the foil by the radiatively heated and ionized buffer material. Because the opacity of the high-Z foil impedes the flow of radiation, the foil is not volumetrically heated and hence does not develop a back-pressure. The foil is accelerated by the resulting pressure imbalance. Rad-hydro simulations indicate that laser facilities such as the proposed NIF (National Ignition Facility) and HU (Helen Upgrade), and perhaps Nova, can generate pressures of order tens (HU) to hundreds (NIF) of Mbar for several nanoseconds. For the same radiation drive, this method generates typically double the pressure that would be generated if the sample were ablatively accelerated, at the expense of requiring additional energy to heat the buffer material. We will present Lasnex simulations of experimental designs that could be fielded on HU, NIF, and maybe Nova.
Landen Otto L.
Lindl John D.
Rosen Mordecai D.
Shepard T. D.
Suter Laurence J.
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