Design and Simulation of an Electron Optical System for Terahertz Vacuum Devices

Area of Science:

• Physics
• Electrical Engineering
• Applied Electromagnetics

Background:

• High-frequency electronic systems require precise control of electron beams.
• Existing electron optic systems face challenges in maintaining beam stability and transmission efficiency at high frequencies.
• The development of advanced electron optic systems is crucial for next-generation terahertz devices.

Purpose of the Study:

• To design and optimize an electron optic system (EOS) for 340-GHz frequency applications.
• To achieve stable and efficient transmission of a sheet electron beam through a narrow beam tunnel.
• To evaluate the performance of a pole offset periodic cusped magnet (PO-PCM) in beam confinement.

Main Methods:

• Utilized computer simulation technology (CST) to design and optimize the sheet electron beam gun (SEB) and EOS.
• Designed a sheet electron beam with specific voltage, compression ratio, and beam waist parameters.
• Employed a pole offset periodic cusped magnet (PO-PCM) to generate an axial magnetic field for beam guidance.

Main Results:

• Successfully designed a sheet electron beam with 29 kV voltage, 16 compression ratio, and 0.17 mm × 0.044 mm beam waist.
• The EOS demonstrated efficient transmission of a 6.9 mA beam through a 0.516 mm × 0.091 mm beam tunnel.
• Achieved a 100% stable beam transmission rate with a 0.32 T axial magnetic field from the PO-PCM.

Conclusions:

• The developed electron optic system, incorporating a sheet electron beam gun and PO-PCM, is highly effective for 340-GHz applications.
• The system ensures stable and lossless transmission of electron beams, crucial for high-frequency device performance.
• This design represents a significant advancement in electron optics for terahertz frequency ranges.