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Gigabar spherical shock generation on the OMEGA laser.

R Nora1, W Theobald2, R Betti1

  • 1Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623, USA and Fusion Science Center, University of Rochester, Rochester, New York 14623, USA and Department of Physics and Astronomy and/or Mechanical Engineering, University of Rochester, Rochester, New York 14623, USA.

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Summary

Researchers experimentally demonstrated launching high-pressure shocks in spherical targets, a key step for shock ignition. This achieved over 300 Mbar ablation pressures, significantly advancing inertial confinement fusion research.

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Area of Science:

  • Physics
  • Plasma Physics
  • High-Energy-Density Physics

Background:

  • Shock ignition is a proposed method for inertial confinement fusion.
  • Achieving high pressures is crucial for efficient fusion.
  • Previous experiments have not reached the required shock strengths.

Purpose of the Study:

  • To experimentally demonstrate the capability to launch strong shocks in spherical targets.
  • To infer shock-launching pressures using radiation-hydrodynamic simulations.
  • To investigate the enhancement of shock strength by suprathermal electrons.

Main Methods:

  • Experimental demonstration of shock launching in spherical targets.
  • Utilizing temporal delay between shock launching and convergence for pressure inference.
  • Radiation-hydrodynamic simulations to analyze shock dynamics.
  • Measurement of absorbed laser intensities and converted energy.

Main Results:

  • First experimental demonstration of launching shocks of several-hundred Mbar in spherical targets.
  • Inferred peak ablation pressures exceeding 300 Mbar at absorbed laser intensities of ~3x10^15 W/cm^2.
  • Significant shock strength enhancement due to suprathermal electron coupling (up to 8% converted energy).
  • Estimated shock pressure exceeding 1 Gbar at the end of the laser pulse due to convergence.

Conclusions:

  • The study successfully demonstrated the capability to launch strong shocks, a milestone for shock ignition.
  • Suprathermal electron coupling plays a significant role in enhancing shock strength.
  • The achieved pressures and shock strengths are promising for advancing inertial confinement fusion research.