研究目的
To design and experimentally validate a radial sheet beam terahertz source driven by a radial pseudospark discharge plasma electron gun for compact, inexpensive, high-power terahertz generation without external magnetic fields.
研究成果
The radial sheet beam THz source design shows promise for high-power output without external magnetic fields, with PIC simulations predicting kilowatt-level power at 0.22 THz. Preliminary experiments confirmed beam generation but highlighted issues with voltage stability and plasma effects. Future work should incorporate background plasma in simulations and improve the PSDP-EGUN for longer beam duration.
研究不足
Background plasma was not considered in the simulation, which may overestimate output power. The experimental beam current duration is limited to a narrow range (10-30 ns) due to quick voltage collapse. Assembly difficulty for small gap power extraction in THz band and sensitivity to gas pressure are constraints.
1：Experimental Design and Method Selection:
The study employs theoretical analysis and particle-in-cell (PIC) simulation for designing a radial sheet beam THz source. A radial pseudospark discharge plasma electron gun (PSDP-EGUN) is used to generate a circular plate-shaped sheet beam, eliminating the need for external magnetic fields. The beam-wave interaction cavity is designed based on radial TM01 mode analysis and beam conductance theory.
2：Sample Selection and Data Sources:
The experiment uses a self-breakdown one-gap radial PSDP-EGUN fabricated and tested with air as the operation gas. Data on discharge characteristics, beam current, and voltage are collected.
3：List of Experimental Equipment and Materials:
Equipment includes a radial PSDP-EGUN, DC power source (40 kV, 60 mA), external energy storage capacitor (2 nF), discharging current limiting resistor (CuSO4 solution, 150 Ω), Rogowski coil, voltage divider, circular Faraday cup, and a perspex container. Materials include air gas and copper for the EIO structure.
4：Experimental Procedures and Operational Workflow:
The PSDP-EGUN is sealed in a circular perspex container. Gas pressure is varied using a leak valve. Discharge is initiated with a self-breakdown mechanism, and waveforms of beam current and voltage are measured using a Rogowski coil and voltage divider. PIC simulation is conducted with specific beam voltage and current waveforms to model the THz source output.
5：Data Analysis Methods:
Data analysis involves numerical calculation of beam conductance, PIC simulation for output power estimation, and experimental measurement of discharge parameters. Time-frequency analysis is used for output electric field characterization.
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