Bulletin of the American Physical Society
2006 APS April Meeting
Saturday–Tuesday, April 22–25, 2006; Dallas, TX
Session B3: Laboratory Astrophysics: Supernovae and Jets |
Hide Abstracts |
Sponsoring Units: DPP GPAP Chair: Paul Bellan, California Institute of Technology Room: Hyatt Regency Dallas Landmark C |
Saturday, April 22, 2006 10:45AM - 11:21AM |
B3.00001: Structure of Supernova Remnant Shock Waves Invited Speaker: The traditional model of supernova remnants as spherical blast waves works in few cases, but not many. In young SNRs, the asymmetry of the supernova explosion itself is important, as jets, dense clumps and large rings of material interact with the interstellar gas or with shocked ejecta. In older remnants, the inhomogeneous density distribution of the ambient gas dominates the structure, and both dynamical (Rayleigh-Taylor, thin shell, Kelvin-Helmholtz) and thermal instabilities can become important. This talk gives an overview of the processes and the parameter ranges important for supernova remnant studies. [Preview Abstract] |
Saturday, April 22, 2006 11:21AM - 11:57AM |
B3.00002: Modeling Supernova Shocks with Intense Lasers. Invited Speaker: Large-scale directional outflows of supersonic plasma are ubiquitous phenomena in astrophysics, with specific application to supernovae. The traditional approach to understanding such phenomena is through theoretical analysis and numerical simulations. However, theoretical analysis might not capture all the relevant physics and numerical simulations have limited resolution and fail to scale correctly in Reynolds number and perhaps other key dimensionless parameters. Recent advances in high energy density physics using large inertial confinement fusion devices now allow controlled laboratory experiments on macroscopic volumes of plasma of direct relevance to astrophysics. This talk will present an overview of these facilities as well as results from current laboratory astrophysics experiments designed to study hydrodynamic jets and Rayleigh-Taylor mixing. This work is performed under the auspices of the U. S. DOE by Lawrence Livermore National Laboratory under Contract No. W-7405-ENG-48, Los Alamos National Laboratory under Contract No. W-7405-ENG-36, and the Laboratory for Laser Energetics under Contract No. DE-FC03-92SF19460. [Preview Abstract] |
Saturday, April 22, 2006 11:57AM - 12:33PM |
B3.00003: Modeling Astrophysical Jets in a Laboratory Experiment Invited Speaker: We will present experimental results on formation of supersonic radiatively cooled plasma jets with dimensionless parameters (Mach number $\sim $20, cooling parameter $\sim $1 and density contrast $\rho $j/$\rho $a $\sim $10) similar to those in proto-stellar jets. Two different experimental configurations are used. In the first the produced jets are purely hydrodynamic and are used to study deflection of the jets by the cross-wind. The ``cross wind'' leads to deflection of the jet through formation of internal oblique shocks in the jet and we will discuss the relevance of these observations to the astrophysical systems. In the second configuration the jets have toroidal magnetic field and the plasma beta in these jets is of the order of unity. We will present experimental data on the dynamics of ``magnetic bubble'' surrounding the jet and on the development of m=0,1 instabilities in the jet. Although at later times the jet column is observed to go unstable, we observe that the jet retains its collimation. Modifications of the experimental configuration allowing addition of the poloidal magnetic field and angular momentum to the jet will be also discussed. The experiments are scalable to astrophysical flows in that critical dimensionless numbers such as the plasma collisionality, the plasma beta and the magnetic Reynolds number are all in the astrophysically appropriate ranges. In collaboration with A. Ciardi, D. Ampleford, S.N. Bland, S.C. Bott, J.P. Chittenden, G. Hall, C. Jennings, J. Rapley A. Frank, E. G. Blackman, T. Lery. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700