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Simultaneous compression and opacity data from time-series radiography with a Lagrangian marker.

Damian C Swift¹, Andrea L Kritcher¹, James A Hawreliak¹

¹Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA.

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|July 10, 2021

Summary

Time-resolved radiography measures shock Hugoniot states. Adding Lagrangian markers helps determine material opacity and improve shock state accuracy, especially for high-pressure converging shocks.

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Area of Science:

High-pressure physics
Materials science
Shock wave physics

Background:

Time-resolved radiography is crucial for determining shock Hugoniot states.
One-dimensional converging shocks allow probing a range of pressures in a single experiment.
At high pressures, x-ray opacity decreases significantly due to increased temperature.

Purpose of the Study:

To investigate the use of Lagrangian markers to constrain opacity and Hugoniot states.
To improve the accuracy of deducing material properties from shock experiments.
To analyze converging shock waves in polystyrene using this technique.

Main Methods:

Utilizing time-resolved radiography to measure shock parameters.
Incorporating Lagrangian markers with known mass.
Analyzing shock wave propagation and material response.
Applying the technique to converging shock experiments in polystyrene.

Main Results:

Lagrangian markers provide additional constraints for opacity and Hugoniot state determination.
Opacity of shocked material can be uniquely determined under specific conditions.
Deducing non-assumed properties (equation of state or opacity) is more accurate with marker layers.
Demonstrated analysis for converging shock waves in polystyrene.

Conclusions:

Lagrangian markers enhance the accuracy of shock Hugoniot state and opacity measurements.
The technique is particularly valuable for high-pressure, high-temperature regimes.
This method offers a more robust approach to material property determination in dynamic experiments.