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Diffusion-dominated mixing in moderate convergence implosions.

A B Zylstra1, N M Hoffman1, H W Herrmann1

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This summary is machine-generated.

Diffusion, not hydrodynamic instabilities, is the primary driver of high-Z material mix in inertial fusion implosions. This finding, based on high-resolution Omega data, suggests diffusion dominates over instability-driven mix.

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Area of Science:

  • Nuclear Fusion Science
  • Plasma Physics
  • Hydrodynamics

Background:

  • High-Z material contamination in inertial fusion (IF) fuel is a known impediment to achieving ignition.
  • The prevailing assumption attributes fuel degradation primarily to hydrodynamic instabilities.
  • Understanding the dominant mix mechanism is critical for optimizing IF performance.

Purpose of the Study:

  • To investigate the primary mechanism responsible for high-Z material mix in inertial fusion implosions.
  • To challenge the conventional understanding of mix being dominated by hydrodynamic instabilities.
  • To provide high-resolution experimental data to elucidate the mix process.

Main Methods:

  • Utilized data from the Omega laser facility.
  • Employed specialized target shells with approximately 150nm deuterated layers.
  • Achieved unprecedented resolution to analyze mix phenomena in moderate-temperature (≲6 keV) and convergence (∼12) implosions.

Main Results:

  • Experimental data provide strong evidence that diffusion is the dominant mechanism for high-Z material mix.
  • Instability-driven or turbulent mix at small scales was found to be negligible in these specific implosion conditions.
  • The findings challenge the long-held assumption of hydrodynamic instabilities as the primary mix driver.

Conclusions:

  • Diffusion, rather than hydrodynamic instabilities, is identified as the principal driver of high-Z material mix.
  • This discovery has significant implications for modeling and improving inertial fusion implosion designs.
  • Future IF research should prioritize understanding and mitigating diffusion-driven mix.