Generation of powerful subnanosecond microwave pulses by intense electron bunches moving in a periodic backward wave structure in the superradiative regime.
Generation of powerful subnanosecond microwave pulses by intense electron bunches moving in a periodic backward wave structure in the superradiative regime.
复制标题
通过在超辐射范围内以周期性后向波结构移动的强电子束产生强大的亚纳秒微波脉冲。
DOI：
10.1103/physreve.60.3297
复制
发表时间：
1999
影响因子：
2.4
通讯作者：
V. Tarakanov
中科院分区：
文献类型：
--
作者：
N. Ginzburg;N. Novozhilova;I. Zotova;A. Sergeev;N. Peskov;A. Phelps;S. M. Wiggins;A. Cross;K. Ronald;Wenlong He;V. Shpak;M. Yalandin;S. Shunailov;M. R. Ul’maskulov;V. Tarakanov
给出了观察亚纳秒电子束通过周期波导并与后向波相互作用产生的相干受激辐射的实验结果。产生了KA和W波段的亚纳秒微波脉冲，重复频率高达25赫兹。微波脉冲的产生机制与自聚束以及由于波相对于电子的滑移而引起的电子脉冲不同部分的相互影响有关，这可被解释为超辐射。一组霓虹灯的照明产生了与TM01模式的激发相对应的精细结构的图案。对环境空气的射频击穿的观察以及热载流子锗探测器的直接测量，导致估计在38 GHz的300-ps脉冲的绝对峰值功率高达60 mW。将这些结果与数值模拟结果进行了比较。初步观测到了75 GHz、10-15 mW、持续时间小于150ps的辐射脉冲。
Experimental results of the observation of coherent stimulated radiation from subnanosecond electron bunches moving through a periodic waveguide and interacting with a backward propagating wave are presented. The subnanosecond microwave pulses in Ka and W bands were generated with repetition frequencies of up to 25 Hz. The mechanism of microwave pulse generation was associated with self-bunching, and the mutual influence of different parts of the electron pulse due to slippage of the wave with respect to the electrons; this can be interpreted as superradiance. The illumination of a panel of neon bulbs resulted in a finely structured pattern corresponding to the excitation of the TM01 mode. Observation of rf breakdown of ambient air, as well as direct measurements by hot-carrier germanium detectors, leads to an estimate of the absolute peak power as high as 60 MW for the 300-ps pulses at 38 GHz. These results are compared with numerical simulations. The initial observation of 75-GHz, 10-15-MW radiation pulses with a duration of less than 150 ps is also reported.