Physics – Plasma Physics
Scientific paper
Nov 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aps..dpp.qi103d&link_type=abstract
American Physical Society, 41st Annual Meeting of the Division of Plasma Physics, November 15-19, 1999 Seattle, WA, abstract #QI
Physics
Plasma Physics
Scientific paper
We have used the Nova laser, and plan to use the Omega laser, to perform experimental simulations of some very young supernova remnants, on space and time scales over which their structure can be approximated as planar. Our special focus has been the remnant forming from SN1987A, in which the stellar ejecta have begun a dramatic collision with a circumstellar ring. In the supernova, the blast wave launches ejecta outward from the star. In the experiments (R.P. Drake, et al., Ap. J. Lett. 500, L157 (1998).) an ablation-driven, strong shock launches ejecta outward from a layer of plastic into vacuum. In both cases: (a) the ejecta expand and cool to produce a low-pressure but high-Mach-number plasma flow; (b) the ejecta drive a strong forward shock into the nearby matter; (c) a reverse shock forms where these ejecta stagnate against the moving interface with this matter; (d) the interface between the ejecta and this matter is unstable to the Rayleigh Taylor (RT) instability. A careful theoretical analysis(D.D. Ryutov, et al., ApJ 518, 821 (1999).) has established that the experiment is a well-scaled hydrodynamic model of SN1987A. Using x-ray backlighting, we have measured the motion of the forward shock and of the stagnated ejecta(R.P. Drake, et al., Phys. Rev. Lett. 81, 2068 (1998). ) and also the growth of the RT instability. Simulations of the resulting turbulence with the laboratory code, CALE , and with the astrophysics code, VH-1, and related simulations of turbulence in SNRs with PROMETHEUS(J. Kane, et al., Ap. J. 511, 335 (1999).) will be discussed. These systems are examples of flow-driven hydrodynamics, which abounds in nature but has been studied little in the laboratory. 1.R.P. Drake, et al., Ap. J. Lett. 500, L157 (1998). 2. D.D. Ryutov, et al., ApJ 518, 821 (1999). 3. R.P. Drake, et al., Phys. Rev. Lett. 81, 2068 (1998). 4. J. Kane, et al., Ap. J. 511, 335 (1999).
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