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Development of a 3-D tomography technique for Large Helical Device bolometry using EMC3-EIRENE grids.

Koyo Munechika1, Hiroaki Tsutsui1, Byron J Peterson2,3

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A new 3-D tomography technique enhances bolometry in the Large Helical Device. This method improves data accuracy for fusion energy research by using advanced smoothing and multiple bolometer types.

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Area of Science:

  • Plasma physics
  • Fusion energy research
  • Diagnostic techniques

Background:

  • Bolometry is crucial for measuring plasma radiation in fusion devices.
  • Existing tomography techniques have limitations in resolution and coverage.
  • Accurate plasma diagnostics are essential for understanding and controlling fusion reactions.

Purpose of the Study:

  • To develop and validate a novel three-dimensional (3-D) tomography technique for the Large Helical Device (LHD) bolometry system.
  • To improve the spatial resolution and accuracy of plasma radiation measurements.
  • To compare the performance of a new 3-D smoothing method against conventional techniques.

Main Methods:

  • Development of a 3-D tomography technique using EMC3-EIRENE mesh coordinates.
  • Integration of resistive bolometers and infra-red imaging video bolometers (1088 channels total).
  • Application of 3-D extended relative gradient smoothing and tetrahedralization for geometry matrix calculation.

Main Results:

  • Achieved a high resolution of 59,400 voxels in the reconstructed solution.
  • Obtained physically meaningful solutions with minimal negative power, validated by phantom emission and synthetic data.
  • Demonstrated superior performance of 3-D extended relative gradient smoothing compared to conventional minimum Fisher regularization.

Conclusions:

  • The developed 3-D tomography technique significantly enhances bolometric measurements in the LHD.
  • The combination of multiple bolometer types and advanced 3-D smoothing provides more accurate and comprehensive plasma radiation data.
  • This advancement contributes to better plasma diagnostics and control in fusion research.