具有变态光子带隙结构的相对论Cherenkov辐射源的研究

提出了一种变态光子带隙结构，研究了由这种结构构成的周期慢波系统的Cherenkov辐射源的特性. 利用高频仿真软件以及三维粒子模拟软件对变态及常态光子带隙慢波系统中类TM₀₁模的色散特性及注-波互作用物理过程进行了模拟研究. 结果表明，在变态光子带隙慢波系统中，类TM₀₁模纵向场分量沿角向分布均匀性得到明显改善，能有效抑制非对称模式，提高输出频谱纯度及注-波互作用效率. 关键词： Cherenkov辐射源 变态光子带隙结构 慢波系统 三维粒子模拟

Relativistic Cherenkov source with modified photonic band-gap cells

A relativistic Cherenkov source with slow wave system consisting of modified photonic band-gap cells is proposed and investigated. The high frequency structure simulator and three-dimensional particle-in-cell simulation code are used to study the dispersion characteristic of TM₀₁-like mode and the interaction between electromagnetic wave and electron beam. The results show that, in the slow wave system with modified photonic band-gap cells, the TM₀₁-like mode has much better azimuthal symmetry, the non-axisymmetry mode can be efficiently suppressed and the operation efficiency can be enhanced greatly.