First Liquid Layer Inertial Confinement Fusion Implosions at the National Ignition Facility.

Area of Science:

• Physics
• Nuclear Fusion
• Plasma Physics

Background:

• Previous inertial confinement fusion (ICF) experiments at the National Ignition Facility (NIF) focused on high convergence ratios (CR>30).
• High convergence amplifies asymmetries, hindering ignition and causing simulation-experiment disagreements.
• Achieving ignition at NIF has been prevented by these asymmetries.

Purpose of the Study:

• To demonstrate cryogenic deuterium (D2) and deuterium-tritium (DT) liquid layer implosions at NIF.
• To explore low-to-moderate hot-spot convergence ratios (12
• To investigate the relationship between convergence ratio and hot-spot formation robustness.

Main Methods:

• Conducting first-of-their-kind cryogenic D2 and DT liquid layer implosions at NIF.
• Utilizing radiation hydrodynamic simulations to model implosion dynamics.
• Comparing experimental data with simulation results to validate understanding.

Main Results:

• Achieved high neutron yields in initial liquid layer experiments with CRs of 12-17.
• Demonstrated well-understood hot-spot formation in low-to-moderate CR implosions.
• Showed good agreement between experimental data and radiation hydrodynamic simulations.

Conclusions:

• The new NIF liquid layer implosion capability provides a platform to study ICF physics.
• Lower convergence ratios reduce the impact of asymmetries, aiding hot-spot formation.
• These experiments offer insights into achieving controlled fusion.