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Multi-channel poloidal correlation reflectometry on experimental advanced superconducting tokamak.

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A new multi-channel poloidal correlation reflectometry system was developed for plasma density fluctuation measurements. This advanced system observed a coherent mode with increasing velocity in the pedestal region of the Experimental Advanced Superconducting Tokamak.

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Area of Science:

  • Plasma physics
  • Fusion energy research
  • Diagnostic techniques

Background:

  • Accurate measurement of plasma density fluctuations is crucial for understanding plasma confinement and stability in fusion devices.
  • Previous diagnostic methods had limitations in spatial resolution and temporal coverage for detailed fluctuation analysis.

Purpose of the Study:

  • To develop and implement a novel multi-channel poloidal correlation reflectometry system.
  • To enhance the capability for spatially resolved measurements of plasma density fluctuations.
  • To investigate plasma dynamics within the pedestal region of the Experimental Advanced Superconducting Tokamak.

Main Methods:

  • Utilized eight dielectric resonator oscillators (12.5-18 GHz) as sources, up-converted to V band.
  • Employed a single launch antenna and two poloidally separated receive antennas.
  • Implemented I/Q demodulators and a filter bank for signal processing after down-conversion.

Main Results:

  • The system successfully measured density fluctuations at 8 radial × 2 poloidal spatial points.
  • A coherent mode exhibiting an increasing velocity from 50 kHz to 100 kHz was detected.
  • The observed mode was localized within the steep gradient region of the plasma pedestal.

Conclusions:

  • The developed multi-channel poloidal correlation reflectometry is an effective diagnostic for studying plasma fluctuations.
  • The system's capability to resolve spatial and temporal characteristics provides valuable insights into pedestal dynamics.
  • Further research can utilize this system to explore turbulence and transport mechanisms in fusion plasmas.