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Open AccessArticle

Low-Energy State Electron Beam in a Uniform Channel

Department of Electrical and Computer Engineering, University of New Mexico, Abuquerque, NM 87131-0001, USA
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Plasma 2019, 2(2), 222-228; https://doi.org/10.3390/plasma2020016
Received: 21 January 2019 / Revised: 20 May 2019 / Accepted: 21 May 2019 / Published: 27 May 2019
(This article belongs to the Special Issue High-Power Microwave and Plasma Interactions)
In our earlier work, we showed that a low-energy state of an electron beam exists in a nonuniform channel between two virtual cathodes in a magnetron with diffraction output, which consists of three uniform sections with increasing radius. A uniform axial magnetic field fills the interaction space. This led to magnetron operation with >90% efficiency when combined with a magnetic mirror field at the output end. In this present paper, we show that a low-energy state of an electron beam can be realized in a uniform channel in which an increasing magnetic field is used in order to create a magnetic mirror at the output end. We consider two cases, one where the injected beam current slightly exceeds the space-charge-limiting current and the other where the injected beam current greatly exceeds the space-charge-limiting current. On the time scale of relevance to planned experiments (∼30 ns), when the injected current slightly exceeds the space-charge-limiting current a stationary virtual cathode forms and when the injected current greatly exceeds the space-charge-limiting current the virtual cathode oscillates back and forth. View Full-Text
Keywords: high power microwaves; virtual cathode; magnetron with diffraction output; MDO; magnetic mirror high power microwaves; virtual cathode; magnetron with diffraction output; MDO; magnetic mirror
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Fuks, M.; Andreev, D.; Kuskov, A.; Schamiloglu, E. Low-Energy State Electron Beam in a Uniform Channel. Plasma 2019, 2, 222-228.

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