Pulsewidth limitation in the relativistic backward wave oscillator

Sergei D. Korovin, Gennady A. Mesyats, Igor V. Pegel, Sergei D. Polevin, Vladimir P. Tarakanov

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Abstract

Spontaneous pulse shortening occurring in a relativistic backward wave oscillator (BWO) at gigawatt power levels is studied in experiment and theory. It is experimentally demonstrated that this phenomenon is accompanied by formation of an explosive-emission plasma at the surface of the corrugated slow-wave structure (SWS). Termination of microwave emission is explained by the increase of the BWO starting current from the absorption of the operating electromagnetic wave by electrons emitted from the plasma, whereas the intensity of the absorption radically increases owing to the presence of positive ions emitted from the plasma. Application of oil-free vacuum and electrochemical polishing of the SWS surface in an X-band BWO allowed generation of 3-GW, 26-ns microwave pulses with an energy of approx. 80 J, thereby demonstrating pulse lengthening by a factor of four.

Original language	English
Pages (from-to)	485-495
Number of pages	11
Journal	IEEE Transactions on Plasma Science
Volume	28
Issue number	3
DOIs	https://doi.org/10.1109/27.887654
Publication status	Published - 1 Jun 2000
Externally published	Yes

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ASJC Scopus subject areas

Nuclear and High Energy Physics
Condensed Matter Physics

Cite this

Korovin, S. D., Mesyats, G. A., Pegel, I. V., Polevin, S. D., & Tarakanov, V. P. (2000). Pulsewidth limitation in the relativistic backward wave oscillator. IEEE Transactions on Plasma Science, 28(3), 485-495. https://doi.org/10.1109/27.887654

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AU - Korovin, Sergei D.

AU - Mesyats, Gennady A.

AU - Pegel, Igor V.

AU - Polevin, Sergei D.

AU - Tarakanov, Vladimir P.

PY - 2000/6/1

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AB - Spontaneous pulse shortening occurring in a relativistic backward wave oscillator (BWO) at gigawatt power levels is studied in experiment and theory. It is experimentally demonstrated that this phenomenon is accompanied by formation of an explosive-emission plasma at the surface of the corrugated slow-wave structure (SWS). Termination of microwave emission is explained by the increase of the BWO starting current from the absorption of the operating electromagnetic wave by electrons emitted from the plasma, whereas the intensity of the absorption radically increases owing to the presence of positive ions emitted from the plasma. Application of oil-free vacuum and electrochemical polishing of the SWS surface in an X-band BWO allowed generation of 3-GW, 26-ns microwave pulses with an energy of approx. 80 J, thereby demonstrating pulse lengthening by a factor of four.

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10.1109/27.887654