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

Ginzburg, N S and Novozhilova, N Y and Zotova, I V and Sergeev, A S and Peskov, N Y and Phelps, A D R and Wiggins, S M and Cross, A W and Ronald, K and He, W and Shpak, V G and Yalandin, M I and Shunailov, S A and Ulmaskulov, M R and Tarakanov, V P (1999) Generation of powerful subnanosecond microwave pulses by intense electron bunches moving in a periodic backward wave structure in the superradiative regime. Physical Review E: Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics, 60 (3). pp. 3297-3304. ISSN 1063-651X

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Official URL: https://doi.org/10.1103/PhysRevE.60.3297

Abstract

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].

Author(s):	Ginzburg, N S, Novozhilova, N Y, Zotova, I V, Sergeev, A S, Peskov, N Y, Phelps, A D R ORCID: https://orcid.org/0000-0002-1100-1012, Wiggins, S M ORCID: https://orcid.org/0000-0001-7804-6146, Cross, A W ORCID: https://orcid.org/0000-0001-7672-1283, Ronald, K ORCID: https://orcid.org/0000-0002-8585-0746, He, W ORCID: https://orcid.org/0000-0001-7018-0527, Shpak, V G, Yalandin, M I, Shunailov, S A, Ulmaskulov, M R and Tarakanov, V P
Item type:	Article
ID code:	36131
Keywords:	superradiance, superradiant, BWO, electron beam, electron bunch, millimetre wave devices, millimeter sources, Ka-band, W-band, Plasma physics. Ionized gases, Physics and Astronomy(all), Mathematical Physics, Statistical and Nonlinear Physics, Condensed Matter Physics
Subjects:	Science > Physics > Plasma physics. Ionized gases
Department:	Faculty of Science > Physics
Depositing user:	Pure Administrator
Date deposited:	28 Nov 2011 11:02
Last modified:	03 Jan 2020 08:30
URI:	https://strathprints.strath.ac.uk/id/eprint/36131
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