研究目的
To design a 0.22THz folded-waveguide oscillator with higher output power and efficiency than BWOs, using analytic Pierce theory and time-domain simulations.
研究成果
The maximum output power of the oscillator can reach 5W with the 18kV/50mA electron beam, with an efficiency of about 1%. The simulation data provides a design method for a 0.22THz folded-waveguide oscillator using helical corrugation waveguide later.
研究不足
The electric tunable bandwidth is limited to about 1GHz in the range of 0.219THz ~ 0.22THz. Increasing the beam voltage beyond a certain point causes the stable oscillation to break down.
1：Experimental Design and Method Selection:
The design was conducted using analytic Pierce theory and time-domain simulations.
2：Sample Selection and Data Sources:
The folded-waveguide slow wave structure parameters were determined by fitting to the circuit dispersion and impedance as functions of frequency by the 3D finite element EM code.
3：List of Experimental Equipment and Materials:
The design parameters include wide side, narrow side, straight side, half period number, beam channel diameter, cathode voltage, and cathode current.
4：Experimental Procedures and Operational Workflow:
The folded-waveguide slow wave structure was divided into two sections with different phase velocities to increase electron beam efficiency.
5：Data Analysis Methods:
The output power was simulated in PIC software, and the results were analyzed for maximum output power and efficiency.
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