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A new 0.65 THz Solid-state Source Interferometer-Polarimeter (SSIP) accurately measures plasma density and Faraday rotation on the EAST tokamak. This advanced system shows excellent agreement with existing diagnostic tools.

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Area of Science:

  • Plasma Physics
  • Fusion Energy Research
  • Diagnostic Techniques

Background:

  • Accurate plasma diagnostics are crucial for understanding and controlling fusion plasmas.
  • Existing diagnostic systems may have limitations in resolution or measurement capabilities.

Purpose of the Study:

  • To introduce and validate a novel 0.65 THz Solid-state Source Interferometer-Polarimeter (SSIP) for plasma diagnostics.
  • To assess the SSIP's capability for line-integrated density and Faraday rotation measurements on the Experimental Advanced Superconducting Tokamak (EAST).

Main Methods:

  • Installation of a vertical-viewing SSIP system utilizing three independent solid-state diode sources operating at 0.65 THz.
  • Employing frequency multipliers (X48) for probing beam generation and optimized high-sensitivity mixers for intermediate frequency (IF) detection.
  • Achieving multichannel measurements with low phase noise, enabling high-resolution density and Faraday rotation determination.

Main Results:

  • The SSIP achieved a density resolution of 3.3 × 10^17 m^-2 and Faraday rotation resolution of approximately 1.5°.
  • Density measurements were successfully performed at an IF of ~0.85 MHz in a plasma with a current of ~300 kA.
  • The line-averaged density measured by SSIP (3.5 × 10^19 m^-3) demonstrated strong agreement with established POlarimeter-INTerferometer (POINT) and CO2 dispersion interferometer systems.

Conclusions:

  • The 0.65 THz SSIP is a viable and accurate diagnostic tool for EAST.
  • The SSIP system offers high sensitivity and resolution for crucial plasma parameters.
  • The successful validation confirms the SSIP's potential for future fusion research.