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Scanning-probe Single-electron Capacitance Spectroscopy
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Development of a triple probe array for mode conversion study of electron cyclotron wave.

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Researchers developed a triple probe array for electron density measurements in tokamaks. This tool aids in understanding electron cyclotron to electron Bernstein wave mode conversion research.

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Area of Science:

  • Plasma Physics
  • Fusion Energy Research

Background:

  • Mode conversion research is crucial for understanding plasma behavior in fusion devices.
  • Electron cyclotron waves transforming into electron Bernstein waves impacts plasma heating and stability.

Purpose of the Study:

  • To design and implement a novel triple probe array for measuring electron density profiles.
  • To investigate mode conversion from electron cyclotron to electron Bernstein waves in a tokamak.

Main Methods:

  • A modified triple probe technique was employed using an array of 36 molybdenum tips.
  • The probe array was installed on the Sino-UNIted Spherical Tokamak.
  • Measurements focused on the radial profile of electron density in the plasma edge region.

Main Results:

  • The triple probe array successfully measured the radial electron density profile of ohmic heated plasmas.
  • Temporal evolution of the density profile was recorded and analyzed.
  • Data provided insights into the mode conversion processes occurring within the plasma.

Conclusions:

  • The developed triple probe array is effective for electron density diagnostics in tokamaks.
  • The study contributes to the understanding of wave-particle interactions and mode conversion phenomena.
  • Further research can utilize this technique to optimize plasma control and heating in fusion reactors.