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Updated: Aug 2, 2025

Emission Spectroscopic Boundary Layer Investigation during Ablative Material Testing in Plasmatron

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Published on: June 9, 2016

Inverse Bremsstrahlung Absorption.

D Turnbull¹, J Katz¹, M Sherlock²

¹University of Rochester Laboratory for Laser Energetics, Rochester 14623, New York, USA.

Physical Review Letters

|April 21, 2023

Summary

This summary is machine-generated.

Accurate inverse bremsstrahlung absorption measurements in plasmas require accounting for the Langdon effect, laser-frequency dependence, and ion screening. These factors are crucial for understanding laser-target coupling in fusion energy research.

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Area of Science:

Plasma physics
Fusion energy research
Laser-plasma interactions

Background:

Inverse bremsstrahlung absorption is a key process in laser-plasma interactions.
Current models used in radiation-hydrodynamic simulations often lack necessary corrections.
Accurate modeling is essential for understanding energy coupling in inertial confinement fusion.

Purpose of the Study:

To experimentally measure inverse bremsstrahlung absorption in a well-characterized plasma.
To identify and quantify necessary corrections to existing absorption models.
To inform more accurate simulations of laser-target coupling in fusion implosions.

Main Methods:

Transmission measurements through a finite-length plasma.
Spatially resolved Thomson scattering for plasma characterization.
Comparison of experimental data with theoretical models, varying absorption components.

Main Results:

Experimental data requires inclusion of the Langdon effect for accurate modeling.
A laser-frequency dependence in the Coulomb logarithm is necessary, differing from transport theories.
A correction for ion screening significantly improves model-data agreement.

Conclusions:

Standard models for inverse bremsstrahlung absorption in fusion simulations are incomplete.
Updated models incorporating the Langdon effect, laser-frequency dependence, and ion screening are vital.
Revising these models will enhance our understanding of laser-target coupling in inertial confinement fusion.