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Angular filter refractometry analysis using simulated annealing.

P Angland1, D Haberberger1, S T Ivancic1

  • 1Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14636, USA.

The Review of Scientific Instruments
|November 3, 2017
PubMed
Summary
This summary is machine-generated.

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A new analysis method for angular filter refractometry (AFR) uses an annealing algorithm to accurately determine plasma density profiles. This technique achieves 5%-20% uncertainty, advancing laser-produced plasma characterization.

Area of Science:

  • Plasma Physics
  • Laser-Plasma Interactions
  • Optical Diagnostics

Background:

  • Angular filter refractometry (AFR) is a key diagnostic for laser-produced plasmas.
  • Characterizing density profiles of long-scale-length plasmas is crucial for fusion energy research.
  • Existing analysis methods for AFR can be limited in accuracy and scope.

Purpose of the Study:

  • To develop a novel, robust analysis method for angular filter refractometry (AFR) images.
  • To improve the accuracy and reduce uncertainty in determining plasma density profiles.
  • To apply the new analysis technique to experimental data from laser-irradiated targets.

Main Methods:

  • Development of an annealing algorithm for iterative image analysis.
  • Construction of synthetic AFR images based on user-defined density profiles (eight parameters).

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  • Optimization using the minimization of the chi-squared (χ²) test statistic for parameter convergence and uncertainty calculation.

    • Main Results:

    • Successful application of the annealing algorithm to experimental AFR data.
    • Accurate characterization of plasma density profiles from a flat, laser-irradiated target.
    • Achieved an average uncertainty of 5%-20% in the plasma density profile within the region of interest.

    Conclusions:

    • The novel annealing algorithm provides a reliable method for analyzing AFR images.
    • This technique significantly enhances the characterization of laser-produced plasma density profiles.
    • The method offers a valuable tool for future research in high-energy-density physics and inertial confinement fusion.