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Telecommunications and Radio Engineering
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ISSN Imprimir: 0040-2508
ISSN En Línea: 1943-6009

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Telecommunications and Radio Engineering

DOI: 10.1615/TelecomRadEng.v55.i10-11.220
6 pages

On the Feedback in Smith-Purcell Experiments

Boris Kuz'mich Skrynnik
Senior Researcher and Head of department in the Institute of Radio Engineering and Electronics, Ukrainian National Academy of Sciences. Rewarded with the Prize of the USSR Council of Ministers.
M. Yu. Demchenko
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine. 12, Academician Proskura St., Kharkov 61085, Ukraine

SINOPSIS

Excitation of fast (bulk) waves 0.9 and 3.6 mm band and at angles close to 90° from an electron beam which is not modulated by an external signal has been experimentally detected. The above experiments were similar to those of Smith-Purcell, but they were made over the millimeter wavelength range and at an accelerating voltage from 2.5 to 5.2 kV. The minus first space harmonic of a slow (surface) wave of the periodic structure excited in the wavelength range from 11 to 0.5 mm in the BWT regime has been used for the self-modulation of the electron beam.
Analysis of the known conditions has been performed notably the excitation of fast and slow waves, modulation of an electron beam by a slow wave, both spatial and time retardation of the higher-order harmonics of an electron beam. The results have been verified experimentally.
It is stated that a principally unavoidable positive feedback via a slow wave of a plane grating has been used to obtain the electron beam modulation in the Smith-Purcell experiments as in the case of this particular experiment.


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