Physics – Plasma Physics
Scientific paper
Nov 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aps..dpp.jp146w&link_type=abstract
American Physical Society, 41st Annual Meeting of the Division of Plasma Physics, November 15-19, 1999 Seattle, WA, abstract #JP
Physics
Plasma Physics
Scientific paper
Material strength can affect the growth of the Rayleigh-Taylor (RT) instability in solid materials, where growth occurs by plastic flow. We shocked aluminum foils with a peak pressure of 1.5 Mbar using hohlraum x-ray drive on Nova, and observed the growth of pre-imposed modulations of 10, 20, and 50 μm wavelength with x-ray radiography. Simulations predict significant strength effects at the shorter wavelengths, while data show growth spanning the range between predictions for the fluid and solid cases. Evidence of enough preheat to cause partial melting is seen in VISAR measurements of the thermal expansion of surrogate targets. There is also evidence that grain structure may have imprinted upon the foils. We have pursued dynamic x-ray diffraction as a definitive measurement of the crystal state. We have seen diffraction signals from shocked metals on experiments on Trident and Omega, although such signals were not seen on Nova for the configuration of the RT experiments.
Colvin Jeffrey D.
Gold David M.
Hauer A. A.
Kalantar Daniel H.
Loveridge A.
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