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Updated: Jun 7, 2026

An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
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An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers

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Two-chord interferometry using 3.39 μm He-Ne laser on a flux-coil-generated FRC.

H Gota1, N Bolte, B H Deng

  • 1Tri Alpha Energy, Inc., Rancho Santa Margarita, California 92688, USA. hgota@trialphaenergy.com

The Review of Scientific Instruments
|November 2, 2010
PubMed
Summary

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Improved density profile measurements in the C-2U advanced beam-driven Field-Reversed Configuration (FRC) plasmas.

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A new infrared interferometer accurately measures plasma density in field-reversed configurations (FRCs). This system provides crucial data for understanding FRC plasma dynamics and stability.

Area of Science:

  • Plasma Physics
  • Fusion Energy Research
  • Optical Diagnostics

Background:

  • Field-reversed configurations (FRCs) are a promising approach to fusion energy.
  • Accurate measurement of plasma properties like electron density is critical for FRC development.
  • Existing diagnostic methods may have limitations in FRC environments.

Purpose of the Study:

  • To develop and demonstrate a two-chord infrared He-Ne laser interferometer system.
  • To measure electron density and estimate total temperature in a flux-coil-generated FRC plasma.
  • To validate interferometer measurements against other diagnostic techniques.

Main Methods:

  • Utilized a two-chord heterodyne interferometer system operating at λ(IR)∼3.39 μm.
  • Employed a visible He-Ne laser (λ(vis)∼632.8 nm) for system alignment.

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  • Incorporated a 40 MHz acousto-optic modulator, photodetectors, and quadrature phase detectors.
  • Performed initial measurements at two radial positions in the FRC midplane.

    • Main Results:

    • Measured average electron densities in the range of 2-10×10^19 m⁻³.
    • Observed a time shift in electron density corresponding to radial FRC expansion.
    • Demonstrated agreement between line-averaged density evolution and internal magnetic probe data using a rigid-rotor model.

    Conclusions:

    • The developed infrared interferometer is a viable diagnostic for FRC plasma.
    • The system provides reliable electron density measurements crucial for FRC research.
    • Observed density dynamics offer insights into FRC plasma behavior during expansion.