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Area of Science:

  • Plasma Physics
  • Fusion Energy Research
  • Tomography

Background:

  • Soft x-ray (SX) tomography is crucial for diagnosing fusion plasmas.
  • JT-60SA, a large tokamak, will have limited sight lines for its SX diagnostic, common in future devices.
  • Limited sight lines introduce artifacts in SX tomography, hindering magnetohydrodynamics (MHD) mode analysis.

Purpose of the Study:

  • Investigate L1 regularization to reduce artifacts in SX tomography with limited sight lines.
  • Evaluate alternative basis functions for analyzing MHD modes in elongated tokamak plasmas.

Main Methods:

  • Applied L1 regularization alongside traditional L2 regularization for SX tomography.
  • Utilized Fourier-Bessel series (FBS) and introduced Saito's Laplacian eigenfunction (LEF) as basis functions.
  • Simulated a high beta scenario in JT-60SA prone to MHD modes.

Main Results:

  • L1 regularization significantly reduces artifacts in SX tomography compared to L2 regularization alone.
  • Saito's LEF offers an advantage over FBS as it does not require interior plasma measurements.
  • Both FBS and LEF, when combined with L1 regularization, improve the reconstruction of plasma spatial structures.

Conclusions:

  • L1 regularization is effective in mitigating artifacts in SX tomography with limited sight lines.
  • Saito's LEF is a viable and practical basis function for analyzing MHD modes in tokamaks.
  • The developed methods show promise for improving tomographic analysis in current and future fusion devices.