Physics – Plasma Physics
Scientific paper
Nov 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..dppep1003k&link_type=abstract
American Physical Society, 46th Annual Meeting of the Division of Plasma Physics, 15-19 November, 2004, Savannah, GA. MEETING I
Physics
Plasma Physics
Scientific paper
The interaction of supernova shocks and interstellar clouds is an important astrophysical phenomenon since it can result in stellar and planetary formation. Our experiments attempt to simulate this mass-loading as it occurs when a shock, for example from a supernova, passes through an interstellar cloud. We drive a strong shock using a 5 kJ laser into a foam-filled cylinder with an imbedded 120 μm Al sphere simulating an interstellar cloud. The density ratio between Al and foam is ˜9. X-ray images (from area and point-projection backlighting) show the sphere getting compressed by the shock (t ≈ 5 ns), undergoing a classical Kelvin-Helmholtz roll-up (10 ns) followed by a Widnall instability (20 ns), an inherently 3D effect that breaks the 2D symmetry of the experiment, and then a second Kelvin-Helmholtz roll-up (40 ns). At late times (80 ns), the former sphere has become undetectable, possibly indicating the transition to a turbulent state. UCRL-POST-205355. Work performed under the auspices of the Department of Energy by the Lawrence Livermore National Laboratory under contract number W-7405-ENG-48.
Hansen John Freddy
Klein Ralf
McKee Christopher F.
Miles Aaron
Robey Harry F.
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