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Mixing with applications to inertial-confinement-fusion implosions.

V Rana1, H Lim1, J Melvin1

  • 1Department of Applied Mathematics and Statistics, Stony Brook University, Stony Brook, New York 11794-3600, USA.

Physical Review. E
|February 18, 2017
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Summary
This summary is machine-generated.

Simulations for the National Ignition Facility (NIF) suggest designs are near a performance cliff. Multimode plastic (CH) mix into deuterium-tritium (DT) hot-spots could significantly impact fusion performance.

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Area of Science:

  • Plasma Physics
  • Computational Physics
  • Fusion Energy

Background:

  • One-dimensional (1D), 2D, and 3D simulations are crucial for designing and analyzing experiments at the National Ignition Facility (NIF).
  • 1D simulations are particularly important for design optimization in inertial confinement fusion (ICF).

Purpose of the Study:

  • To investigate the potential for mix in National Ignition Campaign (NIC) designs using coupled 1D simulation codes.
  • To assess the impact of modeling errors, design features, and unmodeled instabilities on fusion performance.

Main Methods:

  • Coupling a 1D buoyancy-drag mix model with a 1D ICF simulation code.
  • Developing a package of plasma transport parameters relevant to NIC experiments.
  • Analyzing multimode plastic (CH) mix into deuterium-tritium (DT) hot-spots.

Main Results:

  • NIC designs are predicted to be close to a performance cliff, sensitive to mix effects.
  • Single instabilities are unlikely to cause hot-spot mix, but combined effects can impact hot-spot thermodynamics.
  • Potential mix effects include interactions with the DT ice-gas boundary, Eulerian diffusion, and ablation-driven instabilities.

Conclusions:

  • Combined mode mixing effects, coupled with stagnation Rayleigh-Taylor instability, pose a risk to hot-spot performance.
  • The developed plasma transport parameters help approximate quantities and rule out certain mix possibilities.
  • Accurate modeling of mix is essential for optimizing ICF designs and achieving ignition.