Physics – Condensed Matter
Scientific paper
Jun 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aps..shk..d303k&link_type=abstract
American Physical Society, Conference on Shock Compression of Condensed Matter June 28-July 2, 1999 Snowbird, Utah, abstract #D3
Physics
Condensed Matter
Scientific paper
Material strength can be important in the plastic flow of solid state materials at high pressure, affecting the growth of perturbations due to the Rayleigh-Taylor instability (J. F. Barnes et al), J. Appl. Phys. 45, 727 (1974). footnote A. I. Lebedev et al, Proc. 4^th IWPCTM, 29 March-1 April, 1993. In order to study the material properties of metal foils at pressures up to several Mbar, we compress the foils with staged shocks using a temporally shaped x-ray drive generated in a Nova hohlraum target, and observe the growth of pre-imposed modulations by x-ray radiography. Thin Al foils are mounted in contact with a bromine doped polystyrene ablator. These foils are then compressed quasi-adiabatically to a peak pressure of 1.4 Mbar. A detailed x-ray drive characterization has been done, including measurements of shock speed, preheat, and foil trajectory. The x-ray drive was calculated by a viewfactor analysis, and also by a full hohlraum simulation for the shielded hohlraum used in this experiment. With the resulting drive model, the Al foil is calculated to remain solid throughout the experiment. The material strength properties of Al are predicted to reduce the instability growth of pre-imposed modulations at the embedded ablator-metal interface by factors of 2 or more compared to classical (fluid). We present details of the x-ray drive characterization, modeling, and results of the instability growth measurements in Al foils with 10-50 μm wavelength perturbations.
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