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Emission Spectroscopic Boundary Layer Investigation during Ablative Material Testing in Plasmatron

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Published on: June 9, 2016

Plasma adiabatic lapse rate.

Peter Amendt¹, Claudio Bellei, Scott Wilks

¹Lawrence Livermore National Laboratory, California 94551, USA.

Physical Review Letters

|September 26, 2012

Summary

This summary is machine-generated.

Researchers discovered a new plasma temperature gradient source in binary ion mixtures, crucial for understanding fusion implosions. This finding impacts simulations of plastic ablators, revealing effects not captured by current models.

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Area of Science:

Plasma physics
Fusion energy research
Astrophysical fluid dynamics

Background:

The adiabatic lapse rate describes temperature variations with height in Earth's atmosphere.
Understanding plasma temperature gradients is essential for modeling fusion processes and astrophysical phenomena.
Current simulations often use single-fluid models, potentially missing multi-species plasma complexities.

Purpose of the Study:

To derive the plasma analog of the atmospheric adiabatic lapse rate.
To identify and characterize new sources of plasma temperature gradients.
To assess the impact of these gradients on inertial-confinement-fusion implosions.

Main Methods:

Theoretical derivation of plasma temperature gradient in binary ion mixtures.
Analysis of the dependence on concentration gradients and ionization states.
Application of derived physics to inertial-confinement-fusion (ICF) plastic ablator simulations.

Main Results:

A novel source of plasma temperature gradient was identified, proportional to concentration gradient and difference in average ionization states.
This effect is potentially significant in plastic (CH) ablators used in ICF.
An associated plasma thermodiffusion coefficient was derived, and charge-state diffusion in single-species plasma was predicted.

Conclusions:

The newly discovered temperature gradient mechanism is not accounted for in standard single-fluid plasma simulations.
This finding necessitates improved multi-species modeling for accurate ICF implosion predictions, particularly for plastic ablators.
The derived coefficients and predictions offer new avenues for plasma transport and diffusion research.