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Faraday-effect polarimeter-interferometer system for current density measurement on EAST.

H Q Liu1, Y X Jie1, W X Ding2

  • 1Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, People's Republic of China.

The Review of Scientific Instruments
|November 29, 2014
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Summary
This summary is machine-generated.

A new multichannel far-infrared laser system, the POlarimeter-INTerferometer (POINT), is being developed for the EAST tokamak. It will measure plasma current and electron density with high resolution and low noise.

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Area of Science:

  • Plasma physics
  • Fusion energy research
  • Optical diagnostics

Background:

  • Accurate measurement of plasma parameters like electron density and current density is crucial for understanding and controlling fusion plasmas.
  • Existing diagnostic systems may have limitations in resolution, real-time feedback, or spatial coverage.

Purpose of the Study:

  • To develop and calibrate a novel multichannel far-infrared laser-based POlarimeter-INTerferometer (POINT) system.
  • To enable real-time measurements of current density and electron density profiles in the EAST tokamak.

Main Methods:

  • Utilizing a multichannel far-infrared laser with a three-wave technique.
  • Employing a double-pass optical arrangement with novel molybdenum retro-reflectors.
  • Developing a high-bandwidth (250 kHz) Digital Phase Detector for real-time data acquisition.

Main Results:

  • Achieved electron line-integrated density resolution better than 5 × 10^16 m⁻² (approximately 2°).
  • Demonstrated Faraday rotation angle root-mean-square phase noise below 0.1°.
  • The developed Digital Phase Detector provides real-time Faraday rotation angle and density phase shift output.

Conclusions:

  • The POINT system shows promising capabilities for high-resolution, real-time plasma diagnostics.
  • The developed diagnostic is suitable for advanced control and physics studies in fusion devices like the EAST tokamak.
  • The novel optical design and digital detection electronics contribute to improved measurement performance.