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Novel angular velocity estimation technique for plasma filaments.

M Lampert1, A Diallo1, S J Zweben1

  • 1Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540, USA.

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Summary
This summary is machine-generated.

A new method estimates filament rotation speed in fusion plasmas. This analysis of edge localized mode (ELM) filaments helps understand heat and particle loads, improving plasma-facing component lifetime.

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Area of Science:

  • Plasma physics
  • Fusion energy research
  • Computational physics

Background:

  • Filaments like blobs and edge localized modes (ELMs) transport heat and particles in fusion plasmas.
  • Their dynamics impact plasma-facing component lifetime and fusion reactor performance.
  • Understanding filament rotation is crucial for predicting plasma loads.

Purpose of the Study:

  • To introduce a novel analysis method for estimating filament angular velocity in fusion plasmas.
  • To enable frame-by-frame time resolution analysis of filament dynamics.
  • To improve the understanding of heat and particle transport mechanisms.

Main Methods:

  • Pre-processing of imaging data.
  • Two-dimensional (2D) Fourier transformation of image frames.
  • Transformation of spectra to log-polar coordinates.
  • Calculation of 2D cross-correlation coefficient function (CCCF) between consecutive frames.
  • Estimation of rotation angle from CCCF peak displacement.

Main Results:

  • The method accurately estimates the angular velocity of rotating Gaussian structures.
  • Validation confirms the robustness and accuracy of the proposed technique.
  • Application to National Spherical Torus Experiment (NSTX) gas-puff imaging data demonstrates real-world applicability.

Conclusions:

  • The developed method provides a reliable way to quantify filament rotation in fusion plasmas.
  • This technique enhances the study of plasma transport phenomena.
  • Improved understanding of filament dynamics can lead to better control strategies and extended component lifetimes.