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Separated reactant mix width across diffusion-dominated and hydrodynamically dominated interface mix in inertial

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Material mix in inertial confinement fusion (ICF) is primarily diffusion-driven at the fuel-shell interface. Cooler, slower ICF implosions show increased mix, suggesting a transition in mixing mechanisms.

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Area of Science:

  • Physics
  • Plasma Physics
  • Nuclear Fusion

Background:

  • Inertial confinement fusion (ICF) research investigates plasma behavior and energy production.
  • Understanding material mix is crucial for optimizing ICF performance and achieving ignition.
  • Two primary mix regimes exist: diffusion-dominated and hydrodynamic-dominated.

Purpose of the Study:

  • To characterize diffusion-dominated mix in ICF.
  • To investigate the sensitivity of a novel ICF mix platform to fuel-shell interface mixing.
  • To expand the analysis of ICF mix across various implosion conditions.

Main Methods:

  • Utilized a thin (150 nm) separated reactants ICF mix platform for high-resolution analysis.
  • Expanded the experimental platform to a series of OMEGA ICF implosions.
  • Employed hydrodynamic simulations incorporating a buoyancy-drag mix model.

Main Results:

  • A diffusion mechanism dominates material mix in moderate convergence (CR~12) ICF implosions.
  • Increased mix width and amount were observed in cooler, slower, and more compressive implosions.
  • Hydrodynamic simulations necessitate a buoyancy-drag model to replicate observed mix widths.

Conclusions:

  • Material mix in ICF is predominantly diffusion-driven at the fuel-shell interface.
  • Implosion conditions significantly influence the extent of material mix.
  • A transition between diffusion and hydrodynamic mix mechanisms is suggested by the data.