Diagnosing plasmas with wideband terahertz pulses

Area of Science:

• Plasma physics
• Terahertz (THz) science and technology
• Diagnostic methods

Background:

• Accurate characterization of electron plasma density and temperature is crucial for understanding and optimizing various plasma applications.
• Existing diagnostic methods may have limitations in spatial resolution or applicability to specific plasma regimes.

Purpose of the Study:

• To present a novel diagnostic method for measuring electron plasma density and temperature.
• To describe the accompanying model used for data analysis.
• To highlight the utility of this diagnostic for specific plasma environments.

Main Methods:

• Exploitation of wideband terahertz (THz) pulses.
• Development and application of a theoretical model to interpret THz-plasma interactions.
• Characterization of plasma parameters along a symmetry axis.

Main Results:

• The presented method successfully provides measurements of electron plasma density and temperature.
• The model enables the characterization of the plasma density and temperature profile.
• The diagnostic's effectiveness is demonstrated for relevant plasma conditions.

Conclusions:

• The wideband THz pulse diagnostic offers a powerful tool for plasma characterization.
• This method is particularly well-suited for diagnostics in plasma acceleration schemes and laser-produced plasma channels.
• The developed model is essential for the accurate interpretation of diagnostic data.