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A new soft x-ray diagnostic system on the Versatile Experiment Spherical Torus visualizes 2D plasma profiles and instabilities. This system aids in understanding magnetohydrodynamics modes for improved fusion energy research.

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Area of Science:

  • Plasma Physics
  • Fusion Energy Research
  • Diagnostic Systems

Background:

  • Understanding plasma behavior is crucial for fusion energy.
  • Magnetohydrodynamics (MHD) modes are key plasma instabilities.
  • Accurate measurement of plasma properties is essential for control.

Purpose of the Study:

  • Develop and validate a new soft x-ray (SXR) array diagnostic system.
  • Measure 2D SXR emissivity profiles.
  • Identify poloidal mode structures in plasma.

Main Methods:

  • Utilized tomographic inversion techniques on line-integrated SXR data.
  • Employed two 20-channel SXR detector arrays (absolute extreme ultraviolet photodiode arrays).
  • Implemented a filter wheel system for energy-dependent measurements and high-speed data acquisition (up to 125 MHz).

Main Results:

  • Successfully acquired 2D SXR emissivity profiles.
  • Enabled visualization of plasma instability structures, including MHD modes.
  • Demonstrated the system's capability with initial measurements from Ohmic plasma in VEST.

Conclusions:

  • The new SXR diagnostic system effectively measures 2D emissivity profiles and identifies poloidal mode structures.
  • This advancement provides valuable insights into plasma instabilities.
  • The system is a promising tool for fusion research on the VEST device.