Three-dimensional modeling of microwave discharges in a waveguide-based plasma source with experimental comparison

Area of Science:

• Physics
• Plasma Science
• Electromagnetics

Background:

• Microwave-induced plasmas in waveguides are crucial for various applications.
• Accurate simulation of transient discharge processes is computationally demanding.
• Understanding power coupling and discharge evolution is essential for optimizing plasma sources.

Purpose of the Study:

• To develop a computationally efficient transient 3D model for microwave-induced plasma discharges.
• To investigate the influence of waveguide geometry and material properties on plasma behavior.
• To accurately predict power coupling efficiency and discharge dynamics.

Main Methods:

• A transient three-dimensional (3D) model was developed for simulating microwave-induced discharges.
• A plane-symmetric simplification was applied to reduce computational resources.
• Numerical simulations captured the entire discharge process from breakdown to steady state.

Main Results:

• The model accurately simulates microwave breakdown and stable plasma column formation.
• Power coupling efficiencies were calculated for varying glass tube properties.
• The study revealed electromagnetic waveguide structure changes during discharge.

Conclusions:

• The proposed 3D model with plane-symmetric simplification is valid and efficient.
• The method accurately predicts microwave plasma discharge characteristics.
• This approach enables detailed investigation of waveguide-based plasma sources.