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Related Experiment Video

Updated: Jun 7, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

Two-color CO2/HeNe laser interferometer for C-2 experiment.

O Gornostaeva¹, B H Deng, E Garate

¹Tri Alpha Energy, Inc., P.O. Box 7010, Rancho Santa Margarita, California 92688, USA.

The Review of Scientific Instruments

|November 2, 2010

Summary

This summary is machine-generated.

A new interferometer system reliably measures plasma electron density in the C-2 experiment using a CO(2) laser. This advanced diagnostic tool offers high time resolution for fusion research.

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Area of Science:

Plasma Physics
Fusion Energy Research
Optical Diagnostics

Background:

Accurate plasma electron density measurements are crucial for understanding and controlling fusion plasmas.
The C-2 field-reversed configuration experiment requires advanced diagnostic tools for plasma characterization.

Purpose of the Study:

To develop and implement a robust multi-channel interferometer system for electron density diagnostics.
To assess the performance and reliability of the interferometer in the C-2 plasma environment.

Main Methods:

A six-channel, two-color interferometer utilizing a CO(2) laser for density probing.
Incorporation of visible HeNe laser beams for active vibration compensation.
Real-time data acquisition and analysis for plasma density determination.

Main Results:

The developed interferometer system demonstrated reliable performance as a turn-key diagnostic.
Achieved a maximum residual phase noise of ±5° after vibration compensation.
Measured line integral densities up to 3×10^18 m⁻², with a time resolution of 2 μs.

Conclusions:

The six-channel interferometer is a reliable and effective tool for electron density measurements in the C-2 experiment.
The system's vibration compensation ensures high-accuracy density data.
The achieved performance metrics support its utility in ongoing fusion energy research.