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We propose a model which describes the sideband electrons emission from a vertically aligned monolayer graphene with an internal time-oscillating barrier and static surface barrier. Our results show that electron emission is governed by the over-barrier emission process, where the emitting current line density J [nA/nm] is only dependent on the amplitude V1 and frequency ω of the oscillating barrier,...
A periodic cusped magnetic (PCM) focusing W-Band sheet beam electron optics system is designed. The beam voltage and current are 75 kV and 3.8 A, respectively. The guns with different focusing electrode potentials are simulated and its influences on the electron beam transmission are presented. The PCM focusing structure is modified to match the focusing magnetic field and the injected beam state...
Some physical phenomena had been observed in the collector region of the C-band and S-band MBKs made by Institute of Electronics, Chinese Academy of Sciences (IECAS). One of them is the overheating of the collector inner surface, which will lead to the evaporation of the copper. The second one is the potential drop at the entrance of the collector, which will lead to the electron reflection. The third...
The reasons of limitations in field emitter implementation in powerful RF tubes are investigated, overcoming ways are discussed. The results of electron beam optic system (EOS) design with planar type matrices of field emission cathodes and intense beams with power above 100 kW in CW mode are presented.
Many emerging applications for high power RF sources place a premium on electrical efficiency. For pulsed systems, much of the energy is lost in the rising and falling edges of the beam current. This paper presents the concept of a pulsed depressed collector and the resulting improvements in system efficiency.
The technique of resonance effects analysis in the quantum exchange interaction of the electron and positron flows is developed. At the framework of macroscopic quantum theory conducted a joint decision of the Schrödinger and Poisson equations for the macroscopic wave function of the electrons and positrons. Resonance effects in the quantum exchange interaction leads to self-organization of the active...
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