3D simulation of electron beam squeezed-state generation in a two-section drift tube and analysis of its characteristics

In this paper, we propose a novel approach for the design of a virtual cathode oscillator. As a new concept, we suggest a microwave system containing an annular relativistic electron beam travelling through the drift space with dielectric inserts characterized by different values of permittivity. In this case, a virtual cathode which is the source of powerful electromagnetic oscillations forms at the junction of different dielectric materials. According to the mechanism of virtual cathode formation, we have called this device as a virpertron. We have carried out a detailed numerical investigation of virtual cathode formation features in this system via 3D electromagnetic PICsimulation using CST Particle Studio. We have also studied the spectral properties of the microwave radiation generated by the virpertron.

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“…23 Such behavior of the electron beam is typical for traditional magnetically insulated vircators. [23][24][25]…”

Section: Virpertron Design and Featuresmentioning

confidence: 99%

Virpertron: A novel approach for a virtual cathode oscillator design

et al. 2017

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Higher-order modes excitation in generator with photonic crystal

et al. 2019

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Generation of high-current pulses by a magnetized squeezed electron beam

et al. 2019

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The space charge limited current of an electron beam generated in a magnetically insulated foil-less diode by a cylindrical or hollow cathode and injected into a cylindrical drift tube depends on the energy of the electrons and on the ratio of the beam radius to the tube radius. When this beam drifts into a tube of larger radius, it exceeds the corresponding space charge limit. This leads to the formation of a virtual cathode and to the reduction of the energy of the beam. The latter is known as a squeezed beam state. When the cylindrical tube consists of more segments of different radii and lengths, the dynamics of the beam can be manipulated. We propose a simple configuration resulting in the production of a high-frequency periodic train of high-current electron beam pulses.

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3D simulation of electron beam squeezed-state generation in a two-section drift tube and analysis of its characteristics

Cited by 3 publications

References 10 publications

Virpertron: A novel approach for a virtual cathode oscillator design

Virpertron: A novel approach for a virtual cathode oscillator design

Higher-order modes excitation in generator with photonic crystal

Generation of high-current pulses by a magnetized squeezed electron beam

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