Comparative analysis of microwave radiation generated by the interaction between electron beam and plasma under...

Area of Science:

• Plasma Physics
• Beam-Plasma Interactions
• Electromagnetic Wave Generation

Background:

• Understanding the interaction between charged particle beams and plasma is crucial for various applications, including fusion energy and space physics.
• Previous models have explored beam-plasma instabilities, but a comprehensive physical model detailing radiation characteristics is needed.

Purpose of the Study:

• To develop a physical model for surface electron beam-plasma interactions.
• To derive and analyze dispersion relations for these interactions.
• To investigate the influence of key parameters on radiation frequency and bandwidth.

Main Methods:

• Development of a physical model for surface electron beam-plasma interaction.
• Derivation of dispersion relations using perturbation and field matching methods.
• Parametric analysis of electron beam velocity, plasma density, and electron beam density on radiation characteristics.

Main Results:

• Increased electron beam velocity elevates kinetic energy, enhancing maximum radiation frequency and high-frequency bandwidth.
• Higher plasma density increases maximum radiation frequency but decreases high-frequency bandwidth while widening low-frequency bandwidth.
• A plasma density threshold exists beyond which high-frequency electromagnetic wave radiation ceases.

Conclusions:

• The physical model provides insights into the complex relationship between electron beam parameters, plasma properties, and generated radiation.
• Optimizing electron beam velocity and plasma density is key for controlling microwave radiation frequency and bandwidth.
• The identified plasma density threshold is critical for understanding the limits of high-frequency wave generation in such systems.