Counterpropagating Radiative Shock Experiments on the Orion Laser

Area of Science:

• Plasma Physics
• Astrophysical Fluid Dynamics
• High-Energy-Density Physics

Background:

• Radiative shocks are crucial in astrophysics and inertial confinement fusion.
• Understanding shock dynamics and interactions is key for modeling extreme environments.
• Previous studies have limitations in capturing the complex physics of colliding radiative shocks.

Purpose of the Study:

• To experimentally investigate the formation and collision of radiative shocks.
• To provide a benchmark platform for validating radiation hydrodynamic codes.
• To study the interaction between counterpropagating radiative shocks and their precursors.

Main Methods:

• Experiments conducted at the Orion laser facility using xenon gas cells.
• Point-projection X-ray backlighting to observe shock dynamics.
• Optical laser interferometry to measure electron density in radiative precursors.

Main Results:

• Successfully created and studied colliding radiative shocks in xenon.
• Observed inherently three-dimensional shock structures.
• Experimental data showed good agreement with 2D radiation hydrodynamic code simulations (nym and petra).

Conclusions:

• The experimental platform is suitable for benchmarking numerical codes.
• The study provides valuable data for understanding radiative shock physics.
• Validated the predictive capabilities of radiation hydrodynamic codes for these phenomena.