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Wall reflection issues for optical diagnostics in fusion devices.

Ph Lotte1, M H Aumeunier, P Devynck

  • 1CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France. philippe.lotte@cea.fr

The Review of Scientific Instruments
|November 2, 2010
PubMed
Summary
This summary is machine-generated.

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Light reflection from metallic walls in fusion devices like Tore Supra disrupts optical diagnostics. New methods are needed to correct these reflections for accurate measurements in future fusion reactors.

Area of Science:

  • Fusion Energy Research
  • Plasma Physics
  • Optical Diagnostics

Background:

  • Metallic walls in next-step fusion devices cause significant light reflection, perturbing diagnostic measurements.
  • Tore Supra tokamak's reflective stainless-steel panels impact optical systems, particularly infrared imaging and visible spectroscopy.
  • Parasitic light from limiters and plasma affects motional Stark effect and Zeff measurements.

Purpose of the Study:

  • To investigate the impact of light reflection on optical diagnostics in fusion devices.
  • To analyze how reflective surfaces in Tore Supra affect infrared imaging and visible measurements.
  • To assess the feasibility of optical measurements in future devices like ITER.

Main Methods:

  • Analysis of light reflection issues in the Tore Supra tokamak.

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  • Examination of infrared imaging diagnostic data affected by reflected light.
  • Evaluation of motional Stark effect and Zeff measurements influenced by parasitic light.

    • Main Results:

    • Reflected light from the bottom limiter causes inaccuracies in infrared imaging of plasma-facing components.
    • Visible range diagnostics (motional Stark effect, Zeff) show drifts due to parasitic light from the limiter and plasma.
    • Reflective walls significantly perturb optical measurements during plasma heating.

    Conclusions:

    • Light reflection is a critical challenge for optical diagnostics in metallic fusion environments.
    • Accurate optical measurements in future devices like ITER require environmental modeling and online correction techniques.