缓变截面波导型回旋共振放大器理论

本文先采用波动法对缓变截面波导型回旋共振放大器进行理论分析,推导出它的色散方程,这仅适用于小信号情况。另外还利用场与电子流的动功率守恒定理对这类放大器进行理论计算,它可不受小信号限制,可用来计算放大器的饱和输出功率和效率。针对由三段角锥组成的变截面波导系统,对这放大器进行了具体计算。理论计算表明:这种结构的放大器的突出优点是在高功率输出下磁场变化对输出功率影响较小。此外,与均匀波导的同类放大器相比,在相同的输出功率与增益下有更宽的工作频带,互作用长度则有所缩短。 关键词：

THEORY OF ELECTRON CYCLOTRON RESONANCE AMPLIFIER WITH A TAPERED WAVEGUIDE

In this paper the wave approach is used for analysing the ECR amplifier, its dispersion relation is derived, but it is suitable only for the small signal regime. Then by using kinetic power conservation theorem, a theoretical analysis is employed to treat this amplifier, it can be applied beyond the small signal regime to calculate the saturated output power and efficiency of this device. For a concrete waveguide form, the performence of the amplifier has been calculated numerically. The theoretical results show that the amplifiers of this type exhibit an obvious advantage, i.e. the variation of static magnetic field has less influence on its output power, besides, in comparison with the amplifier with a regular waveguide under the condition of same output powers and gains, this amplifier has a wider bandwidth and its interaction length is somewhat shortened.