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Comprehensive imaging of C-2W plasmas: Instruments and applications.

E M Granstedt1, D Gupta1, J Sweeney1

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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.

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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.