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The multi-spectral imaging diagnostic.

B L Linehan1, R T Mumgaard1, M Wensing2

  • 1Plasma Science and Fusion Center MIT, Cambridge, Massachusetts 02139, USA.

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Summary
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A novel Multi-Spectral Imaging (MSI) system captures simultaneous atomic line intensity images. This diagnostic enables 2D mappings of atomic line ratios and absolute intensities for advanced plasma diagnostics.

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Area of Science:

  • Plasma physics
  • Optical diagnostics
  • Spectroscopy

Background:

  • Advanced diagnostics are crucial for understanding fusion plasmas.
  • Existing imaging systems face limitations in throughput and spectral resolution.
  • Multi-spectral imaging offers potential for simultaneous multi-wavelength measurements.

Purpose of the Study:

  • To introduce and validate a novel Multi-Spectral Imaging (MSI) system for plasma diagnostics.
  • To demonstrate the capability of MSI for 2D mapping of atomic line intensities and ratios.
  • To assess the performance of the MSI system in terms of resolution, calibration, and throughput.

Main Methods:

  • A modified polychromator design enables sequential filtering and focusing of images.
  • Commercial CMOS cameras are utilized for image acquisition.
  • Absolute calibration is performed using an integrating sphere and cross-referencing with CAD models.
  • The system was tested on Alcator C-Mod and TCV tokamak devices.

Main Results:

  • The MSI system successfully captured simultaneous spectrally filtered images.
  • 2D mappings of atomic line ratios and absolute intensities were achieved with high spatial registration.
  • Minimal vignetting and aberrations were observed.
  • The system demonstrated high throughput and accurate spectral transmission calibration.

Conclusions:

  • The developed Multi-Spectral Imaging system is a viable and effective diagnostic tool for fusion research.
  • MSI enables advanced plasma characterization through simultaneous multi-wavelength imaging.
  • The system's calibration and registration capabilities allow for quantitative analysis of plasma properties.