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Synthetic diagnostic for electron cyclotron emission imaging
1Department of Electrical and Computer Engineering, University of California, Davis, California 95616, USA.
The Review of Scientific Instruments
|November 8, 2018
Summary
Synthetic diagnostics simulate experimental conditions for quantitative data analysis. The upgraded Electron Cyclotron Emission Imaging system with Field Curvature Adjustment lenses improves resolution and suppresses artifacts in tokamak plasma diagnostics.
Area of Science:
- Plasma physics
- Fusion energy research
- Optical diagnostics
Background:
- Previous Electron Cyclotron Emission Imaging (ECEI) systems faced limitations due to curved image planes, causing crosstalk and reducing vertical resolution.
- The Experimental Advanced Superconducting Tokamak (EAST) upgrade requires enhanced diagnostic capabilities for accurate plasma analysis.
Purpose of the Study:
- To evaluate the performance improvement of the upgraded EAST ECEI system using synthetic diagnostics.
- To assess the impact of Field Curvature Adjustment (FCA) lenses on ECEI system aberrations and artifacts.
Main Methods:
- Development and application of a synthetic ECEI diagnostic tool.
- Simulation of the upgraded EAST ECEI system incorporating FCA lenses.
- Quantitative analysis of synthetic diagnostic data to evaluate image quality and resolution.
Main Results:
- The synthetic ECEI diagnostic confirmed significant advantages of the upgraded system with FCA lenses.
- Correction of spherical aberrations and suppression of field curvature artifacts were observed.
- Improved focusing on high poloidal wavenumber structures was achieved.
Conclusions:
- FCA lenses enhance the upgraded EAST ECEI system's ability to resolve fine plasma structures.
- Synthetic diagnostics are crucial for evaluating and optimizing advanced tokamak diagnostic systems.
- The upgraded system shows potential for better decoupling of density and temperature fluctuations in plasma.
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