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Related Experiment Videos

Systematic Fuel Cavity Asymmetries in Directly Driven Inertial Confinement Fusion Implosions.

R C Shah1, B M Haines1, F J Wysocki1

  • 1Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

Physical Review Letters
|April 15, 2017
PubMed
Summary

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Researchers used X-ray images to study laser-driven implosions. They linked emission asymmetry in titanium tracer layers to drive asymmetry, impacting fusion performance.

Area of Science:

  • Nuclear Fusion Science
  • Plasma Physics
  • High-Energy-Density Physics

Background:

  • Inertial confinement fusion (ICF) relies on symmetric implosions for optimal performance.
  • Understanding and mitigating asymmetries is crucial for achieving ignition.

Purpose of the Study:

  • To investigate the origins of asymmetry in ICF implosions.
  • To correlate observed emission patterns with drive asymmetries.

Main Methods:

  • Acquisition of narrow-band self-emission X-ray images from a titanium tracer layer.
  • Placement of the tracer layer at the fuel-shell interface in 60-laser-beam implosion experiments.
  • Utilizing full-sphere 3D implosion modeling to analyze emission asymmetry.

Main Results:

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  • Systematic asymmetry in X-ray emission was observed during the deceleration phase.
  • Inferred convergences ranged from approximately 9 to 14.
  • The observed emission asymmetry was directly linked to low-mode drive asymmetry.

Conclusions:

  • Low-mode drive asymmetry is a significant factor limiting ICF performance.
  • X-ray imaging of tracer layers provides valuable insights into implosion dynamics.
  • 3D modeling is essential for understanding and diagnosing asymmetry in ICF experiments.