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Double-Pulse Laser-Driven Jets on OMEGA

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Abstract

A double-pulse laser drive is used to create episodic supersonic plasma jets that propagate into a low density ambient medium. These are among the first laser experiments to generate pulsed outflow. The temporal laser-intensity profile consists of two 1-ns square pulses separated by 9.6 ns. The laser is focused on a truncated conical plug made of medium Z material inserted into a high-Z washer. Unloading material from the plug is collimated within the cylindrical washer hole, then propagates into the low-Z foam medium. The resulting jet is denser than the ambient medium. Double-pulse jet evolution is compared to that driven by a single laser pulse. The total drive energy is the same for both jets, as if a source with fixed energy generated a jet from either one or two bursts. Radiographs taken at 100 ns show that a single-pulse jet was broader than the double-pulse jet, as predicted by hydrodynamic simulations. Since the initial shock creating the jet is stronger when all the energy arrives in a single pulse, the jet material impacts the ambient medium with higher initial velocity. Detailed comparisons between single- and double-pulsed jet rheology and shock structure are presented. 2-D hydrodynamic simulations are compared to the experimental radiographs.

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Authors and Affiliations

  1. Laboratory for Laser Energetics, Rochester, NY, 14623, USA

    S. Sublett

  2. Department of Physics and Astronomy, University of Rochester, Rochester, NY, 14627, USA

    S. Sublett

  3. Laboratory for Laser Energetics, Rochester, NY, 14623, USA

    J. P. Knauer & I. V. Igumenshchev

  4. Department of Physics and Astronomy, University of Rochester, Rochester, NY, USA, 14627

    A. Frank

  5. Laboratory for Laser Energetics, Rochester, NY, 14623, USA

    D. D. Meyerhofer

  6. Department of Physics and Astronomy, University of Rochester, Rochester, NY, USA, 14627

    D. D. Meyerhofer

  7. Department of Mechanical Engineering, University of Rochester, Rochester, NY, USA, 14627

    D. D. Meyerhofer

Authors
  1. S. Sublett
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  2. J. P. Knauer
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  3. I. V. Igumenshchev
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  4. A. Frank
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  5. D. D. Meyerhofer
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Corresponding author

Correspondence to S. Sublett.

Additional information

PACS: 52.30.−q 41.75.Jv 42.62.−b 42.68.Sq 47.40.−x 47.56.+r

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Sublett, S., Knauer, J.P., Igumenshchev, I.V. et al. Double-Pulse Laser-Driven Jets on OMEGA. Astrophys Space Sci 307, 47–50 (2007). https://doi.org/10.1007/s10509-006-9206-9

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  • DOI: https://doi.org/10.1007/s10509-006-9206-9

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