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Comprehensive imaging of C-2W plasmas: Instruments and applications
E M Granstedt1, D Gupta1, J Sweeney1
1TAE Technologies, Inc., 19631 Pauling, Foothill Ranch, California 92610, USA.
The Review of Scientific Instruments
|July 10, 2021
Summary
High-speed cameras on the C-2W device visualize plasma, aiding magnetic field calculations and confirming field reversal in FRC plasmas. This imaging supports understanding plasma dynamics and electrode behavior.
Area of Science:
- Plasma physics
- Fusion energy research
- Magnetic confinement fusion
Background:
- The C-2W device (Norman) sustains beam-driven field-reversed configuration (FRC) plasmas in a magnetic mirror.
- Accurate plasma visualization is crucial due to the device's complex geometry and internal dynamics.
- Previous magnetic field measurements faced challenges from eddy currents and internal plasma currents.
Purpose of the Study:
- To deploy and utilize a suite of calibrated, high-speed imaging systems for comprehensive plasma monitoring.
- To apply advanced imaging techniques for non-perturbative plasma diagnostics.
- To validate magnetic field models and investigate plasma behavior in the FRC.
Main Methods:
- Deployment of spatially and radiometrically calibrated, high-speed camera systems.
- Tomographic reconstruction of passive impurity (O4+) emission for plasma geometry visualization.
- Observation of Balmer-α emission to estimate ionization rates.
- Automated image processing for identifying electrode arcing.
Main Results:
- Tomographic reconstruction provided independent visualization of plasma geometry, supporting magnetic modeling and indicating field reversal.
- Balmer-α emission measurements enabled ionization rate estimation for particle balance and circuit models.
- High-speed imaging successfully identified arcing events on electrode surfaces.
Conclusions:
- The imaging suite is essential for global plasma visualization and stability monitoring in the C-2W device.
- Tomographic impurity emission serves as a valuable tool for validating magnetic field models and confirming FRC field reversal.
- Imaging-based diagnostics contribute to understanding plasma dynamics, ionization processes, and operational issues like electrode arcing.
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