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Two-dimensional plasma density evolution local to the inversion layer during sawtooth crash events using beam
Sayak Bose1, William Fox1, Dingyun Liu2
1Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540, USA.
The Review of Scientific Instruments
|October 1, 2022
Summary
New methods analyze Beam Emission Spectroscopy (BES) data to reveal plasma density changes during tokamak sawtooth crashes. These techniques improve understanding of fusion plasma dynamics and edge light interference.
Area of Science:
- Plasma Physics
- Fusion Energy Research
- Spectroscopy
Background:
- Sawtooth crashes are dynamic events in tokamak plasmas.
- Beam Emission Spectroscopy (BES) offers localized, fast 2D measurements.
- Traditional analysis struggles with sawtooth-induced signals.
Purpose of the Study:
- Develop methods to analyze BES data during sawtooth events.
- Improve accuracy of plasma density measurements.
- Characterize density evolution and spatial variations.
Main Methods:
- Developed edge light pulse removal technique for BES data.
- Performed cross-calibration of 64 BES channels.
- Utilized non-linear relationship between BES signal and density variation.
Main Results:
- Successfully removed sawtooth-induced edge light pulses.
- Observed large-amplitude, spatially varying density oscillations.
- Density variations peaked near the temperature crash time.
Conclusions:
- The presented methods enable accurate BES data analysis for sawtooth events.
- Techniques can be applied to study other impulsive MHD phenomena.
- Improved understanding of plasma dynamics during sawtooth crashes.
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