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Hohlraum-driven ignitionlike double-shell implosions on the omega laser facility.

Peter A Amendt1, Harry F Robey, H-S Park

  • 1Lawrence Livermore National Laboratory, Livermore, California 94550, USA.

Physical Review Letters
|March 24, 2005
PubMed
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Experiments on the Omega laser facility demonstrated repeatable neutron production during double-shell implosions. Controlling fuel-pusher mix is crucial for ignition in future fusion energy research.

Area of Science:

  • * Nuclear Fusion and Plasma Physics
  • * Inertial Confinement Fusion (ICF) research

Background:

  • * Achieving ignition in inertial confinement fusion (ICF) requires precise control over implosion dynamics.
  • * Double-shell targets are a promising approach for ICF, but are susceptible to fuel-pusher mix.
  • * Previous experiments have explored various hohlraum designs and diagnostic techniques.

Purpose of the Study:

  • * To investigate high-convergence ignitionlike double-shell implosions on the Omega laser facility.
  • * To experimentally infer neutron production during the compressional phase of double-shell implosions.
  • * To assess the impact of design optimization and fabrication on implosion performance and mix mitigation.

Main Methods:

  • * Utilized cylindrical gold hohlraums with 40 drive beams on the Omega laser.

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  • * Employed time-resolved core x-ray imaging to diagnose the implosion dynamics.
  • * Focused on fall-line design optimization and stringent fabrication standards for targets.

    • Main Results:

    • * Achieved repeatable, dominant primary (2.45 MeV) neutron production.
    • * Inferred neutron production from the mix-susceptible compressional phase.
    • * Demonstrated experimental evidence supporting the importance of precise implosion control.

    Conclusions:

    • * Effective control of fuel-pusher mix during final compression is essential for ignition.
    • * These findings are critical for the development of double-shell targets for the National Ignition Facility (NIF).
    • * Highlights the necessity of advanced target fabrication and diagnostic capabilities for fusion energy research.