研究目的
Investigating the optimization of volume free-electron lasers with photonic crystal structures for operation in the sub-terahertz frequency range.
研究成果
The study demonstrated the possibility of advancing volume free-electron lasers with photonic crystal structures to the sub-terahertz frequency range by optimizing geometric parameters and electron beam dynamics. Excitation of higher order modes and generation at the fifth harmonic of the fundamental frequency were achieved, with an output power of about 3.6 kW. Further optimization could enable excitation of even higher order modes.
研究不足
The miniaturization of the model is limited by the current level of technological development. The study suggests that more precise optimization of system parameters could allow excitation of higher order modes.
1：Experimental Design and Method Selection:
Numerical simulations were carried out using a self-made computational 3D electromagnetic particle-in-cell (PIC) code based on Maxwell equations and relativistic equations of charged particles motion.
2：Sample Selection and Data Sources:
The study considered two configurations of emitters, with two or four electron beams, to investigate the excitation of various modes.
3：List of Experimental Equipment and Materials:
The system consists of a cylindrical drift tube, electron beams, and a photonic crystal made of periodically alternating metal pins.
4：Experimental Procedures and Operational Workflow:
The electron beams are injected into the drift tube, interact with the photonic crystal, and generate electromagnetic radiation.
5：Data Analysis Methods:
The dynamics of the electron beam and the generated electromagnetic fields were analyzed to determine the efficiency and frequency of generation.
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