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A new multi-energy soft x-ray camera on the Madison Symmetric Torus uses a photon-counting detector for precise plasma measurements. This advanced system offers unique spatial and spectral resolution for inferring key plasma properties.

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Area of Science:

  • Plasma Physics
  • Fusion Energy Research
  • X-ray Detection Technology

Background:

  • The Madison Symmetric Torus (MST) requires advanced diagnostics for plasma characterization.
  • Existing x-ray diagnostics may lack the necessary spatial and spectral resolution for detailed plasma property inference.

Purpose of the Study:

  • To introduce and calibrate a novel multi-energy soft x-ray pin-hole camera system.
  • To assess the system's capability for measuring plasma x-ray emissivity with high resolution.
  • To demonstrate the inference of crucial plasma parameters like electron temperature (Te) and effective charge (Zeff).

Main Methods:

  • Installation of a PILATUS3 100 K x-ray detector on the MST.
  • Utilizing the detector's pixel-specific energy threshold capabilities for multi-energy measurements.
  • Calibration of energy dependence across different ranges (1.6-6 keV and 4-14 keV) using fluorescence targets and trimbit settings.
  • Fitting calibration data to an 'S-curve' model to map trimbit settings to energy thresholds.

Main Results:

  • Successful calibration of the detector for the 1.6-6 keV range with an effective threshold resolution of ΔE < 100 eV.
  • Calibration for the 4-14 keV range achieved with a resolution of ΔE < 200 eV.
  • Demonstrated potential for unique spatial and spectral resolution in plasma x-ray emissivity measurements.

Conclusions:

  • The new multi-energy soft x-ray camera system provides high-resolution diagnostics for the MST.
  • The system enables accurate inference of essential plasma properties (Te, nZ, Zeff).
  • This technology advances the capabilities for understanding and controlling fusion plasmas.