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Enhancements in Laser-Direct-Drive Nuclear Performance with Target Radius.

C A Thomas1, W Theobald1,2, J P Knauer1

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Summary
This summary is machine-generated.

Achieving inertial confinement fusion requires larger targets. Larger targets show significantly improved performance, approaching ignition criteria faster than previously thought, especially when accounting for instabilities.

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Area of Science:

  • Nuclear fusion science
  • Plasma physics
  • Laser-matter interaction

Background:

  • Inertial confinement fusion (ICF) requires advanced technology for large-target implosions at high energies.
  • Previous studies may have underestimated the impact of target radius on ICF performance.

Purpose of the Study:

  • To assess the impact of target radius on nuclear performance in direct-drive cryogenic implosions.
  • To quantify the relationship between target radius and neutron yield and areal density.

Main Methods:

  • Experiments were conducted on the OMEGA laser using direct-drive cryogenic implosions.
  • Nuclear performance metrics (neutron yield, areal density) were measured as a function of target radius (R_{t}).

Main Results:

  • Neutron yield scales as R_{t}^{5.0±0.2}, and areal density scales as R_{t}^{1.8±0.2}.
  • These dependencies are stronger than previously assumed, indicating significant sensitivity to target radius.

Conclusions:

  • Larger targets demonstrate superior relative quality and approach ignition criteria more rapidly.
  • Multidimensional effects and instabilities significantly impact implosion performance, with larger targets showing greater relative improvement when imperfections are constant.