Mesyats G A, Ginzburg N S, Golovanov A A, Denisov G G, Romanchenko I V, Rostov V V, Sharypov K A, Shpak V G, Shunailov S A, Ulmaskulov M R, Yalandin M I, Zotova I V
P. N. Lebedev Physical Institute, Russian Academy of Sciences, 119991 Moscow, Russia.
Institute of Applied Physics, Russian Academy of Sciences, 603950 Nizhny Novgorod, Russia.
Phys Rev Lett. 2017 Jun 30;118(26):264801. doi: 10.1103/PhysRevLett.118.264801.
For the first time, we demonstrate experimentally the possibility of Cherenkov superradiant generation with a phase imposed by an ultrashort seed microwave pulse. The phases of seed and initiated Ka-band microwave pulses were correlated with the accuracy of 0.5-0.7 rad for the power ratio down to -35 dB. Characteristics of such a process were determined in the frame of a basic theoretical model that describes both spontaneous and stimulated emission of an electron beam moving in corrugated waveguides. The obtained results open up opportunities of reaching extremely high radiation power density in phased arrays of short-pulse coherently operating microwave generators.
首次通过实验证明了在超短种子微波脉冲施加的相位作用下产生切伦科夫超辐射的可能性。对于低至 -35 dB 的功率比，种子微波脉冲和产生的 Ka 波段微波脉冲的相位相关性精度为 0.5 - 0.7 弧度。在描述电子束在波纹波导中运动的自发和受激辐射的基本理论模型框架内确定了该过程的特性。所得结果为在短脉冲相干运行微波发生器的相控阵中实现极高的辐射功率密度开辟了道路。
