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Emission Spectroscopic Boundary Layer Investigation during Ablative Material Testing in Plasmatron

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Published on: June 9, 2016

Equivalence between pressure- and structure-defined ionization in hot dense carbon.

Jean Clérouin^1,2, Augustin Blanchet^1,2, Christophe Blancard^1,2

¹CEA-DAM-DIF, F-91297 Arpajon, France.

Physical Review. E

|November 18, 2022

Summary

Determining system ionization in hot dense matter is challenging. New definitions based on plasma structure and pressure, validated by advanced simulations, offer a more accurate approach to understanding ionization states.

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Area of Science:

Plasma physics
Computational physics
Materials science

Background:

Accurate determination of ionization in hot dense matter is crucial but challenging.
Existing average atom models show inconsistencies with electronic transport properties from quantum molecular dynamics simulations.

Purpose of the Study:

Propose new definitions for ionization based on plasma structure and pressure.
Investigate the ionization of carbon under hot dense conditions.
Compare new definitions with existing models and experimental data.

Main Methods:

Utilized effective one-component plasma (eOCP) concept and pair distribution functions (PDF).
Introduced definitions based on total pressure and electronic pressure models.
Performed extensive simulations using Ext. First principles molecular dynamics (Fpmd) and Spectral quadrature DFT (Sqdft).

Main Results:

Demonstrated the equivalence of the proposed ionization definitions for carbon.
Compared simulation results with the average-atom code Qaam, revealing discrepancies.
Interpreted deviations from eOCP as indicators of bonding onset in the system.

Conclusions:

The new definitions provide a more accurate measure of ionization in hot dense plasmas.
Disagreements highlight limitations of average atom models and muffin-tin approximations.
The study offers a refined understanding of plasma behavior and bonding under extreme conditions.