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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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A new dispersion interferometer on HL-2A.

H X Wang1, Y Zhou1, Y Li1

  • 1Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.

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|November 3, 2017
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Summary
This summary is machine-generated.

A new CO2 dispersion interferometer effectively measures plasma density on the HL-2A tokamak, overcoming challenges from high density and vibrations. This advanced system ensures accurate density feedback control for fusion research.

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Area of Science:

  • Plasma physics
  • Fusion energy research
  • Optical diagnostics

Background:

  • High plasma density and pellet injection can cause fringe jumps in interferometers.
  • Accurate real-time plasma density measurement is crucial for fusion device control.

Purpose of the Study:

  • To design and commission a new CO2 dispersion interferometer for HL-2A.
  • To achieve reliable average line-density measurement and density feedback control.
  • To mitigate fringe jumps and phase shifts caused by plasma conditions and vibrations.

Main Methods:

  • Utilized a CO2 dispersion interferometer with second harmonic technology.
  • Implemented a digital phase comparator for real-time signal processing.
  • Conducted experiments to characterize system performance, including stability and resolution.

Main Results:

  • Achieved a density measurement resolution better than 8 × 10^17/m^3.
  • Demonstrated effective tracking of rapid plasma density evolution on HL-2A.
  • Confirmed system stability against mechanical vibrations and phase shifts.

Conclusions:

  • The new CO2 interferometer successfully addresses fringe jump issues.
  • The system provides accurate and stable plasma density measurements for feedback control.
  • This diagnostic is valuable for advancing fusion energy research on HL-2A.