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Use of field emission cathodes with high density of electronic current is capable to improve characteristics of electrovacuum devices and to give additional acceleration in development of vacuum microelectronics. For obtaining high density of current it is necessary to increase efficiency and concentration of emission centers. Improvement of field emission of characteristics at production on the flat...
This report summarizes the results obtained in the papers relating to the generation of high frequency signal in crossed electric and magnetic fields. We consider the radial resonator system, with two coaxial cylinders and inhomogeneous magnetic induction, and determine electron trajectories in crossed fields. Trajectories were determined in case of ac magnetic and electric fields with other frequency...
The method and code of electron gun calculation in time domain are presented. The Poisson equation in 2D axial region is solved by integral equation method. For modeling in time domain algorithm «step by step» is used. Three meshes — one spherical and two rectangular — are used for potential calculation and equation of motion solving. The consistent scheme of distribution between mesh points of particle...
This report considers investigation of parametric generation of high frequency oscillations in radial resonator system with crossed electric and magnetic fields. Usually an investigation in that system was conduct in case of parametric resonance or in case of frequency's double multiplications of ac fields. In this report, the authors show the fundamental possibility of parametric generation in crossed...
The paper describes the basic design and technological features of vacuum photosensitive devices. Investigation of the possibility of intensification of the photoemission process using planar nanostructures with controlled localization of the electrostatic field, which are based on the film of diamond-like carbon, is carried out. It is proposed a phenomenological model that describes the tunneling...
The field emission structure with thin conductive substrate of sufficient width and length with a double-sided emitting surface are tangent to the axis and coated with a nanoscale film of diamond-graphite clusters with pulling electrons grid is considered. The grid potential of the order of several (or tens) of volts generates a potential barrier. The electrons are emitted with approximately the Fermi...
The structure of periodic ferrite with thin's modulation which load on periodic ferroelectric studied. The dispersion characteristics was calculated using the modification of finite element method. It is shown, that when ferroelectric load superimposed on the thickest part of the ferrite then changes of permittivity of ferroelectric load influence to band's gap width. It explains the reasons for the...
The ability to achieve the limit values of the klystron efficiency based on COM-bunching mode being considered. It is shown that the most important parameter affecting the transition to this regime is the lumped bunching length (LBL). The dependence of optimal LBL value on the number of cavities was obtained by the step-by-step optimization of different klystrons. It was shown that such a dependences...
Analytical expressions for the longitudinal and radial components of the magnetic induction in the reverse magnetic system cell with two ring inserts in case of inner diameter of ring inserts greater than the diameter of the drift tube have been found with the magnetostatic potential approximation. The electron optics calculations of the klystron with magnetic focusing system containing high harmonic...
This report tells about the behavior of charged particles in the crossed fields with parametric generation of high-frequency oscillations in the initial period of time. Authors consider the radial resonator system, with two coaxial cylinders and inhomogeneous magnetic induction, and determine electron trajectories in crossed fields. Trajectories were determined in case of ac magnetic and electric...
The paper discusses the possibility of forming electron beam in a field emission cells with high (∼ 1000) ratio of the tips' height of the glassy carbon to their radius of curvature. The possibility of creating such a field emission cell, protected by ions, without beam loss on the grid and on the anode is shown. A comparison of the characteristics between considered cells and Grigoriev-Shesterkin...
The Global Scaling Principle (GSP) is formulated. GSP allows to build a 2,5-parametric class of klystrons fully equivalent to one given prototype. Klystrons included in the constructed class, may differ significantly on the operating frequency, power, voltage, according to the number of rays and other key parameters. At the same time all the physical processes in a class of devices are identical....
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