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Density measurements for the National Ignition Facility (NIF) opacity platform
Y P Opachich1, R F Heeter1, H M Johns2
1Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
The Review of Scientific Instruments
|December 3, 2022
Summary
The National Ignition Facility
Area of Science:
- Plasma physics
- Astrophysics
- Stellar evolution
Background:
- Opacity measurements are critical for validating astrophysical models.
- Previous methods lacked in situ density measurements.
- The National Ignition Facility (NIF) provides unique experimental conditions.
Purpose of the Study:
- To present a novel opacity platform for astrophysical research.
- To detail a new in situ density measurement technique.
- To report experimental opacity data for Fe and MgO.
Main Methods:
- Utilizing the NIF to create high-temperature plasmas (150-210 eV).
- Employing a new platform for in situ sample expansion measurement.
- Analyzing plasma conditions by inferring sample density over time.
Main Results:
- Successful implementation of the NIF opacity platform.
- Demonstrated capability for in situ density measurements.
- Acquired new opacity data for Iron (Fe) and Magnesium Oxide (MgO).
Conclusions:
- The NIF opacity platform enhances the validation of radiation-hydrodynamic models.
- In situ density measurements improve understanding of plasma conditions.
- Experimental opacity data contribute to astrophysical simulations.
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