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Velocity-space tomography using prior information at MAST.

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  • 1Department of Physics, Technical University of Denmark, Kgs. Lyngby, Denmark.

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This summary is machine-generated.

Velocity-space tomography diagnoses fast ions in fusion plasmas using multiple instruments. This study analyzes fast-ion distributions before and after sawtooth crashes in a tokamak.

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Area of Science:

  • Plasma physics
  • Fusion energy research
  • Diagnostic techniques

Background:

  • Fast ions are crucial for heating and sustaining fusion plasmas.
  • Accurate measurement of fast-ion distribution functions is essential for understanding plasma behavior.
  • Existing diagnostic methods have limitations in resolving fast-ion velocity space.

Purpose of the Study:

  • To apply velocity-space tomography for diagnosing fast ions in a tokamak.
  • To analyze fast-ion velocity distributions and densities before and after sawtooth crashes.
  • To improve diagnostic capabilities for fusion plasma research.

Main Methods:

  • Utilized toroidally and vertically viewing fast-ion D-alpha diagnostics.
  • Performed velocity-space tomography on the fast-ion distribution function.
  • Incorporated prior information (non-negativity, null-measurement suppression, energy constraints) into inversion techniques due to limited data.

Main Results:

  • Successfully reconstructed fast-ion velocity distributions using tomographic methods.
  • Observed changes in fast-ion velocity distributions and densities correlated with sawtooth crashes.
  • Demonstrated the effectiveness of incorporating prior information for sparse data.

Conclusions:

  • Velocity-space tomography is a viable technique for diagnosing fast ions in tokamaks.
  • The study provides insights into fast-ion dynamics during sawtooth events.
  • Enhanced diagnostic approaches are critical for advancing fusion energy development.