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Reflections from tokamak walls can distort plasma measurements. A new algorithm successfully subtracts these reflections, enabling accurate plasma boundary reconstruction even with metallic surfaces.

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Area of Science:

  • Plasma physics
  • Optical diagnostics
  • Fusion energy research

Background:

  • Plasma emissivity reconstruction is crucial for understanding fusion devices.
  • Specular reflections from metallic tokamak components introduce significant errors in optical measurements.
  • Accurate plasma boundary determination is essential for operational control and data interpretation.

Purpose of the Study:

  • To develop and validate an algorithm for accurate plasma boundary reconstruction in tokamaks.
  • To mitigate systematic errors caused by light reflections from specular surfaces.
  • To provide an independent method for estimating plasma boundary shape.

Main Methods:

  • Utilized data from a fast visible light camera on the COMPASS tokamak.
  • Performed tomographic reconstruction of plasma emissivity.
  • Implemented a background reflection subtraction technique.
  • Analyzed data from a D-shaped tokamak with a metallic vessel, including H-mode plasma conditions.

Main Results:

  • Demonstrated the feasibility of obtaining realistic plasma boundary reconstructions despite highly specular tokamak walls.
  • The developed algorithm proved robust against systematic errors in optical measurements and calibration.
  • Successfully subtracted background reflections to improve reconstruction accuracy.

Conclusions:

  • The developed algorithm provides a reliable method for plasma boundary reconstruction in tokamaks with metallic components.
  • Accurate optical measurements are achievable even in the presence of challenging reflective environments.
  • This technique offers an independent estimate of plasma boundary shape, aiding fusion research.