Solid state material strength effects in hydrodynamic instability experiments on the Nova laser

Details Solid state material strength effects in hydrodynamic instability experiments on the Nova laser Solid state material strength effects in hydrodynamic instability experiments on the Nova laser

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aps..dppkwo209k&link_type=abstract

American Physical Society, Division of Plasma Physics Meeting, November 17-21, 1997, abstract #kWeaO209.

Physics

Plasma Physics

Scientific paper

We are conducting experiments on the Nova laser to investigate the Rayleigh-Taylor (RT) instability in metal foils maintained in the solid state. We use a high contrast shaped 6.5 ns laser pulse to generate a hohlraum x-ray drive that launches a sequence of shocks into a 22 μm CH(Br) ablator and 15 μm thick Cu and Mo foils with a sinusoidal amplitude modulation on the surface at the embedded interface. The metal foils are shock compressed by a factor of 1.5-2.0 at a pressure of 3-5 Mbar, and a temperature below the melt temperature. We observe RT instability growth that is delayed relative to the classical (fluid case) by several nanoseconds, suggesting that the metal foil remains solid. In contrast, a Cu foil is melted on compression with a single strong shock. In this case, the instability growth is consistent with fluid simulations. We present results of the experiments, and compare with 2-D modeling that incorporates a Steinberg-Guinan formulation for material strength. ( D.J. Steinberg et al), J. Appl. Phys. 51, 1498 (1980).

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