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提出采用中等能量的相对论环状电子注激励轴对称三曲面反射镜、绕射光栅系统,产生毫米波、远红外波段辐射的新型准光学可调辐射源实验方案,这是一种基于史密斯帕塞尔效应的自由电子激光。由于引入新型准光学谐振腔系统,可以改变能量输出方向的角度,从原理上讲,可制造一系列模型,产生可调频率的短毫米波、远红外波段相干辐射。采用环状电子注比带状电子注稳定性高,便于成型和聚焦;采用新腔体后增长了电子注与高频场的互作用范围;新型准光腔具有较小的绕射损耗。新方案的这些特点,进一步提高器件的输出功率,改善了高频特性。介绍这种新辐射源在3mm波段的粒子模拟计算初步结果,其输出功率达数百千瓦以上;同时给出准光学谐振腔高频系统的模拟计算和冷测实验的典型曲线。
A new type of quasi-optical tunable radiation source experiment scheme based on the middle energy relativistic cyclic electron injection-excited axisymmetric triloidal reflector and diffraction grating system is proposed, which is based on Smiths Paci Effect of Free Electron Laser. Due to the introduction of a new quasi-optical resonator system, the angle of the energy output direction can be changed. In principle, a series of models can be made to produce tunable frequencies of short millimeter wave and far-infrared band coherent radiation. The ring electron injection is more stable than the strip electron injection, which facilitates the molding and focusing. The new cavity increases the interaction between the electron injection and the high frequency field. The new quasi-cavity has a small diffraction loss. These new features of the program to further improve the output power of the device to improve high-frequency characteristics. The preliminary results of the particle simulation of this new radiation source in 3mm band are introduced. The output power of the new radiation source is over hundreds of kilowatts. The typical curves of the simulation and the cold test of the high frequency system of the quasi-optical resonator are given.