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A new soft x-ray array system on the EXL-50 spherical tokamak provides detailed measurements. This system effectively observes tungsten emissions and analyzes the impact of hard x rays on plasma diagnostics.

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Area of Science:

  • Plasma Physics
  • Fusion Energy Research
  • X-ray Spectroscopy

Background:

  • Tokamak devices are crucial for fusion energy research.
  • Soft x-ray diagnostics are essential for understanding plasma behavior.
  • The EXL-50 spherical tokamak required advanced measurement capabilities.

Purpose of the Study:

  • To describe a novel toroidal soft x-ray array system for the EXL-50.
  • To enable spectrum and intensity measurements of plasma emissions.
  • To investigate tungsten emissions and the effects of hard x rays.

Main Methods:

  • Utilized a 21-channel toroidal soft x-ray array.
  • Employed Silicon Drift Detectors and digital multichannel analyzers.
  • Achieved spatial resolution of ~10 cm with co- and counter-current observation.

Main Results:

  • Attained an average energy resolution of 147 eV at 5.89 keV.
  • Successfully observed tungsten emissions from limiter coatings.
  • Measured soft x-ray spectra with high count rates (>500 kcps).

Conclusions:

  • The developed soft x-ray array system is effective for EXL-50 diagnostics.
  • The system provides valuable data on plasma impurities like tungsten.
  • Understanding hard x-ray influence is critical for accurate soft x-ray measurements.