Bulletin of the American Physical Society
54th Annual Meeting of the APS Division of Plasma Physics
Volume 57, Number 12
Monday–Friday, October 29–November 2 2012; Providence, Rhode Island
Session KI3: Laboratory Astrophysical Plasmas II
3:00 PM–5:00 PM,
Tuesday, October 30, 2012
Room: Ballroom BC
Chair: S. Lebedev, Imperial College London
Abstract ID: BAPS.2012.DPP.KI3.2
Abstract: KI3.00002 : Radiative Reverse Shock Laser Experiments Relevant to Accretion Processes in Cataclysmic Variables*
3:30 PM–4:00 PM
Preview Abstract Abstract
(University of Michigan)
We present results from experiments that explore radiative reverse shock waves and their contribution to the evolving dynamics of the cataclysmic variable (CV) system in which they reside. CVs are close binary star systems containing a white dwarf (WD) that accretes matter from its late-type main sequence companion star. In the process of accretion, a reverse shock forms when the supersonic infalling plasma is impeded. It provides the main source of radiation in the binary systems. In the case of a non-magnetic CV, the impact on an accretion disk produces this ``hot spot,'' where the flow obliquely strikes the rotating accretion disk. This collision region has many ambiguities as a radiation hydrodynamic system, but shock development in the infalling flow can be modeled . We discuss the production of radiative reverse shocks in experiments at the Omega-60 laser facility. The ability of this high-intensity laser to create large energy densities in targets having millimeter-scale volumes makes it feasible to create supersonic plasma flows. Obtaining a radiative reverse shock in the laboratory requires a sufficiently fast flow ($>$ 60 km/s) within a material whose opacity is large enough to produce energetically significant emission from experimentally achievable layers. We will show the radiographic and emission data from three campaigns on Omega-60 with accompanying CRASH  simulations, and will discuss the implications in the context of the CV system. \\[4pt]  Armitage, P. J. and Livio, M., ApJ, 493, 898 (1998).\\[0pt]  van der Holst, B., Toth, G., Sokolov, I.V., et al., ApJS, 194, 23 (2011).
*This work is funded by the NNSA-DS and SC-OFES Joint Program in High-Energy-Density Laboratory Plasmas, grant number DE-FG52-09NA29548, by the National Laser User Facility Program, grant number DE-NA0000850, and by other sponsors.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2012.DPP.KI3.2
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