Influence of positive ions on oscillatory processes in an electron beam with virtual cathode |
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Authors: | R A Filatov Yu A Kalinin A E Khramov D I Trubetskov |
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Institution: | (1) N. G. Chernyshevsky State University of Saratov, Saratov, Russia |
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Abstract: | We numerically simulate the influence of positive ions on characteristics of the microwave oscillations in a nonrelativistic
electron beam with the virtual cathode formed in a decelerating field (low-voltage vircator). A numerical scheme allowing
for ionization of a residual gas by an electron flow is proposed. It is shown that the residual-gas ionization in the operating
chamber of a low-voltage vircator leads to a forcing of the virtual cathode out of the transit gap and to a cutoff of microwave
oscillations. The obtained numerical data are confirmed by an experimental study using a low-voltage vircator model.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 49, No. 10, pp. 853–863, October 2006. |
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