Blast wave energy diagnostic.

Area of Science:

• Plasma Physics
• High-Energy-Density Physics
• Radiation Hydrodynamics

Background:

• Supersonically propagating radiation waves in optically thick, diffusive media are energy-sensitive.
• Blast waves form when radiation waves transition from supersonic to transonic speeds, becoming visible via radiography as density perturbations.
• Previous work demonstrated blast wave positions can measure time-integrated drive energy with <10% uncertainty at the Z Facility.

Purpose of the Study:

• To characterize the energy emerging through a 2.4 mm aperture using blast waves.
• To present experimental results of blast wave energy characterization.
• To compare experimental findings with simulation data.

Main Methods:

• Utilizing blast waves as a diagnostic tool.
• Employing radiography to observe blast wave density perturbations.
• Conducting experiments to measure energy loss through a defined aperture.
• Performing simulations for comparison with experimental data.

Main Results:

• Blast waves were successfully used to characterize energy emerging through a 2.4 mm aperture.
• Experimental results were obtained and compared against simulations.
• The study demonstrates radiography of blast waves as a viable complementary diagnostic for energy loss.

Conclusions:

• Radiography of high-compression blast waves serves as a valuable complementary technique for measuring time-integrated energy loss through apertures.
• This method is particularly useful when direct energy loss measurements via bolometric or x-ray radiometric diagnostics are not possible.
• The study validates the use of blast waves for characterizing energy transport in diffusive media.