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Simulation of oscillatory processes in a beam-plasma system with a virtual cathode in gas-filled interaction space

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Abstract

Physical processes occurring in an intense electron beam with a virtual cathode in an interaction space filled with neutral gas are studied in a two-dimensional model. A mathematical model is proposed for investigating complicated self-consistent processes of neutral gas ionization by the beam electrons and the dynamics of an electron beam and heavy positive ions in the common space charge field with allowance for the two-dimensional motion of charged particles. Three characteristic dynamic regimes of the system are revealed: complete suppression of oscillations of the virtual cathode as a result of neutralizing its space charge by positive ions; the pulsed generation regime, in which the ions dynamics repeatedly suppresses and restores the virtual cathode oscillations; and the continuous generation regime with an anomalously high level of noisy oscillations.

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  1. Chernyshevsky Saratov State University, Astrakhanskaya ul. 83, Saratov, 410026, Russia

    R. A. Filatov & A. E. Hramov

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  1. R. A. Filatov
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Original Russian Text © R.A. Filatov, A.E. Hramov, 2011, published in Fizika Plazmy, 2011, Vol. 37, No. 5, pp. 429–443.

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Filatov, R.A., Hramov, A.E. Simulation of oscillatory processes in a beam-plasma system with a virtual cathode in gas-filled interaction space. Plasma Phys. Rep. 37, 395–408 (2011). https://doi.org/10.1134/S1063780X11040040

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  • DOI: https://doi.org/10.1134/S1063780X11040040

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