We consider the possibilities of producing wideband chaotic terahertz-range radiation in gyrotrons with excitation of cyclotron harmonics. The transition to the chaotic generation mode in gyrotrons requires a significant excess of the operating current over the starting value, which excludes selective operation at cyclotron harmonics due to the intensification of mode competition. At the same time, it is attractive to use a competition-free frequency multiplication effect that arises due to the nonlinear properties of the electron beam. The implementation of the frequency multiplication regime is simplified when using low-energy electron beams. Based on the averaged model of electron-wave interaction, we simulate generation in a 250-GHz low-voltage gyrotron and demonstrate the regime of a double frequency multiplication providing 0.5 THz chaotic radiation with a bandwidth of about 20 GHz and an average power of 0.5 mW. A significant expansion of the spectrum is achieved through to additional resonant interaction at the intersection points of the dispersion characteristics of the operating mode and the electron beam at the second cyclotron harmonic.

我们考虑在回旋加速器谐波激励下在回旋加速器中产生宽带混沌太赫兹范围辐射的可能性。回旋加速器向混沌生成模式的转变需要工作电流显着超过起始值，这排除了由于模式竞争加剧而在回旋加速器谐波下的选择性操作。同时，由于电子束的非线性特性而产生的无竞争倍频效应的使用也很有吸引力。当使用低能电子束时，倍频机制的实现被简化。基于电子波相互作用的平均模型，我们模拟了 250 GHz 低压回旋管的产生，并演示了双倍频的机制，提供了 0.5 THz 混沌辐射，带宽约为 20 GHz，平均功率为 0.5毫瓦。通过在工作模式的色散特性和第二回旋加速器谐波处的电子束的交点处的附加共振相互作用，实现了光谱的显着扩展。