Generation of powerful subnanosecond microwave pulses by intense electron bunches moving in a periodic backward wave structure in the superradiative regime

被引:94
作者
Ginzburg, NS [1 ]
Novozhilova, NY
Zotova, IV
Sergeev, AS
Peskov, NY
Phelps, ADR
Wiggins, SM
Cross, AW
Ronald, K
He, W
Shpak, VG
Yalandin, MI
Shunailov, SA
Ulmaskulov, MR
Tarakanov, VP
机构
[1] Russian Acad Sci, Inst Appl Phys, Nizhnii Novgorod 603600, Russia
[2] Univ Strathclyde, Glasgow G4 0NG, Lanark, Scotland
[3] RAS, Inst Electrophys, Ekaterinburg 620049, Russia
[4] Russian Acad Sci, High Energy Res Ctr, Moscow 127412, Russia
来源
PHYSICAL REVIEW E | 1999年 / 60卷 / 03期
关键词
D O I
10.1103/PhysRevE.60.3297
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
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 390-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. [S1063-651X(99)00709-6].
引用
收藏
页码:3297 / 3304
页数:8
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