Long-path second-harmonic interferometer with nanosecond time resolution: reliable diagnostic tool for electron...

Area of Science:

• Plasma Physics
• Optical Diagnostics

Background:

• Pulsed plasma devices require accurate density measurements.
• Limited optical access poses challenges for diagnostics.

Purpose of the Study:

• To evaluate the performance of a second-harmonic interferometer (SHI) for measuring electron plasma density.
• To assess SHI's suitability for long optical paths and pulsed plasma environments.

Main Methods:

• Utilized a second-harmonic interferometer (SHI).
• Measured electron plasma density in merged plasmoids.
• Employed a 12-meter optical path.
• Achieved time resolution better than 50 ns.

Main Results:

• Demonstrated successful measurement of electron plasma density.
• Verified SHI performance over an extended optical path (>12 m).
• Highlighted excellent mechanical stability and high time resolution (<50 ns).

Conclusions:

• Second-harmonic interferometry is a viable technique for electron plasma density measurement.
• SHI offers excellent stability and time resolution, suitable for pulsed plasma devices.
• The method is particularly advantageous in scenarios with limited optical access.