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Reconstruction of 2D line-integrated electron density using angular filter refractometry and a fast marching Eikonal

B McCluskey1,2, J Griff-McMahon1,2, D Haberberger3

  • 1Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey 08544, USA.

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This summary is machine-generated.

Angular filter refractometry (AFR) now directly reconstructs 2D electron density using a fast-marching Eikonal solver. This advanced method improves plasma diagnostics by accurately inverting AFR data for detailed density mapping.

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Area of Science:

  • Plasma Physics
  • Optical Diagnostics
  • Computational Physics

Background:

  • Angular Filter Refractometry (AFR) measures optical probe beam refraction in plasma.
  • AFR data yields 2D spatial profiles, but requires further analysis for electron density reconstruction.
  • Previous methods relied on limited 1D analysis or forward-fitting techniques.

Purpose of the Study:

  • To develop and validate a direct 2D inversion method for AFR data.
  • To reconstruct the full 2D line-integrated electron density from AFR measurements.
  • To apply and assess the method on experimental plasma plume data.

Main Methods:

  • Utilized a fast-marching Eikonal solver for direct inversion of AFR data.
  • Verified the analysis method using synthetic datasets.
  • Applied the technique to experimental data from single and colliding plasma plumes.

Main Results:

  • Successfully obtained full 2D line-integrated electron density distributions.
  • Calculated densities showed agreement with existing 1D analysis results.
  • Forward modeling confirmed consistency between reconstructed densities and original AFR measurements.

Conclusions:

  • The fast-marching Eikonal solver provides a direct and effective method for 2D electron density reconstruction from AFR data.
  • This technique enhances plasma diagnostics capabilities, offering more detailed insights than previous approaches.
  • Further improvements to the method's precision are discussed for future applications.