等离子体填充盘荷波导高频特性分析

从麦克斯韦方程和流体理论出发，推导了填充磁化等离子体慢波结构的基本方程.在大磁场情况下，对等离子体填充盘荷波导的色散特性和耦合阻抗作了研究，结果表明填充等离子体使色散曲线上移，耦合阻抗提高.等离子体填充产生出模式谱非常丰富的周期性低频等离子体模式(TG模式).当等离子体密度增加到一定程度后，场模TM₀₁模的频率范围和TG₀₁模的频率范围相近，两个模式互相耦合产生出新的混合模G₁,G₂.如果相对论行波管工作在混合模上，将会产生新的工作机理. 关键词： 盘荷波导 等离子体填充 色散特性 相对论行波管

High-frequency properties of the disk-loaded waveguide filled with plasma

Based on the Maxwell equations, the general equation of the slow-wave structure filled with plasma in the finite magnetic field is derived. The dispersion equation and interaction impedance expression of the disk-loaded waveguide filled with plasma in the strong longitudinal magnetic field are studied. The result shows that the frequency of the TM₀₁ mode upshifts and interaction impedance increases as the density of the plasma increases. When a periodic structure is loaded with plasma, the spectrum consists of abundant TG modes (Trivelpiece-Gould modes). As the plasma density increases to a certain degree, the TM₀₁ mode of the disk-loaded waveguide overlaps the TG mode and these two modes will couple with each other and form the new hybrid modes G₁, G₂. If the relativistic Traveling-Wave Tube (TWT) works on the hybrid mode, there will be new working mechanism.