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Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..dppgp1058w&link_type=abstract
American Physical Society, 44th Annual Meeting of the Division of Plasma , abstract #GP1.058
Other
Scientific paper
Recent observations of core collapse supernovae provide increasing evidence that supernova explosions are intrinsically asymmetric. An explosion model based on the assumption that bipolar, non-relativistic jets form during core collapse predicts an efficient ejection of a highly asymmetric supernova envelope and helps in understanding many of the observations (Khokhlov, et. al. ApJ 524, L107, 1999). Since the complex numerical hydrodynamic simulations of these jets require validation, we have designed a series of hydrodynamically-scaled jet experiments on the Omega laser at the University of Rochester. The jet in these experiments is formed by the laser ablation of the end of a cylinder of aluminum or magnesium that is imbedded in a gold washer. The plug is allowed to accelerate through a vacuum region in the washer and then enters into low-density foam as a jet. Several time-dependent transmission images are obtained by irradiating two large disks of titanium or silver that backlight the jet. In the supernova jet calculations, some of the material is accelerated to higher velocities in the equatorial plane (perpendicular to the bipolar jet) by a Mach ring formation. To study this effect, we have fielded experiments that create a Mach ring by the collision of two plates of aluminum that have been accelerated towards each other into a CH plastic. The Mach ring forms in the CH plastic and several radiographs were obtained. We will compare the jet and Mach ring data to simulations done with the LANL RAGE, the AWE NYM/PETRA, and the NRL ALLA codes.*This work is performed under the auspices of the U. S. Department of Energy by the Los Alamos National Laboratory Laboratory under Contract No. W-7405-ENG-36, Lawrence Livermore National Laboratory under Contract No. W-7405-ENG-48, the Laboratory for Laser Energetics under Contract No. DE-FC03-92SF19460, the Office of Naval Research, and the NASA Astrophysical Theory Grant.
Drake Paul R.
Foster John M.
Gardner John H.
Khokhlov Alexei M.
Knauer J. P.
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