Advertisement

Laboratory experiments to study supersonic astrophysical flows interacting with clumpy environments

  • P. A. RosenEmail author
  • J. M. Foster
  • B. H. Wilde
  • P. Hartigan
  • B. E. Blue
  • J. F. Hansen
  • C. Sorce
  • R. J. R. Williams
  • R. Coker
  • A. Frank
Original Article

Abstract

A wide variety of objects in the universe drive supersonic outflows through the interstellar medium which is often highly clumpy. These inhomogeneities affect the morphology of the shocks that are generated. The hydrodynamics are difficult to model as the problem is inherently 3D and the clumps are subject to a variety of fluid instabilities as they are accelerated and destroyed by the shock. Over the last two years, we have been carrying out experiments at the University of Rochester’s Omega laser to address the interaction of a dense-plasma jet with a localised density perturbation. More recently, we have turned our attention to the interaction of a shock wave with a spherical particle. We use a 1.6-mm diameter, 1.2-mm length Omega hohlraum to drive a composite plastic ablator (which includes bromine to prevent M-band radiation from preheating the experiment). The ablator acts as a “piston” driving a shock into 0.3 g cm−3 foam containing a 0.5-mm diameter sapphire sphere. We radiograph along two orthogonal lines of sight, using nickel or zinc pinhole-apertured X-ray backlighters, to study the subsequent hydrodynamics. We present initial experimental results and two-dimensional simulations of the experiment.

Keywords

Laboratory astrophysics Supersonic astrophysical flows Shocked clumps Omega laser 

References

  1. Canny, J.: IEEE Trans. Pattern Anal. Mach. Intell. 8, 679 (1986) CrossRefGoogle Scholar
  2. Coker, R.F., et al.: Astrophys. Space Sci. 307, 57–62 (2007) CrossRefADSGoogle Scholar
  3. Foster, J.M., et al.: Astrophys. J. Lett. 634, L77 (2005) CrossRefADSGoogle Scholar
  4. Gittings, M.L.: Numerical Methods Symposium, April 28–30 (1992). Copies may be ordered from the Defence Nuclear Agency, 56801 Telegraph Road, Alexandria, VA 22310-3398 Google Scholar
  5. Haas, J.-F., Sturtevant, B.: J. Fluid Mech. 181, 41 (1987) CrossRefADSGoogle Scholar
  6. Hansen, J.F., et al.: Astrophys. Space Sci. 307, 147–152 (2007) zbMATHCrossRefADSGoogle Scholar
  7. Hartigan, P., et al.: Proposal 06B-0182 (2007a) Google Scholar
  8. Hartigan, P., et al.: Proposal 11179 (2007b) Google Scholar
  9. Lyon, S.P., Johnson, J.D.: Sesame: the Los Alamos national laboratory equation of state database. Los Alamos National Laboratory, Los Alamos, NM, LA-UR-92-3407 (1992) Google Scholar
  10. Jacobs, J.: Phys. Fluids A 5, 2239 (1993) CrossRefADSGoogle Scholar
  11. Klein, R.I., McKee, C.F., Colella, P.: Astrophys. J. 420, 213 (1994) CrossRefADSGoogle Scholar
  12. Klein, R.I., et al.: Astrophys. J. Suppl. Ser. 127, 379–383 (2000) CrossRefADSGoogle Scholar
  13. Klein, R.I., et al.: Astrophys. J. 583, 245 (2003) CrossRefADSGoogle Scholar
  14. Poludnenko, A., et al.: Astrophys. J. 576, 832 (2002) CrossRefADSGoogle Scholar
  15. Poludnenko, A., et al.: Astrophys. J. 604, 213 (2004) CrossRefADSGoogle Scholar
  16. Ranjan, D., Anderson, M., Oakley, J., Bonazza, R.: Phys. Rev. Lett. 94, 184507 (2005) CrossRefADSGoogle Scholar
  17. Robey, H.F., et al.: Phys. Rev. Lett. 89, 85001 (2002) CrossRefADSGoogle Scholar
  18. Rose, S.J.: J. Phys. B 25, 1667 (1992) CrossRefADSGoogle Scholar
  19. Ryutov, D., Drake, R.P., Kane, J., Liang, E., Remington, B.A., Wood-Vasey, W.M.: Astrophys. J. 518, 821 (1999) CrossRefADSGoogle Scholar
  20. Youngs, D.L.: In: Morton, K.W., Baines, M.J. (eds.) Numerical Methods for Fluid Mechanics. Academic Press, London (1982) Google Scholar
  21. Youngs, D.L.: Physica D 12, 32 (1984) CrossRefADSGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • P. A. Rosen
    • 1
    Email author
  • J. M. Foster
    • 1
  • B. H. Wilde
    • 2
  • P. Hartigan
    • 3
  • B. E. Blue
    • 4
  • J. F. Hansen
    • 5
  • C. Sorce
    • 5
  • R. J. R. Williams
    • 1
  • R. Coker
    • 2
  • A. Frank
    • 6
  1. 1.AWE AldermastonReadingUK
  2. 2.Los Alamos National LaboratoryLos AlamosUSA
  3. 3.Rice UniversityHoustonUSA
  4. 4.General AtomicsSan DiegoUSA
  5. 5.Lawrence Livermore National LaboratoryLivermoreUSA
  6. 6.University of RochesterRochesterUSA

Personalised recommendations