Proceedings of the 18th IEEE International Vacuum Electronics Conference (IVEC-2017)
The Organizing Committee is pleased to announce the Eighteenth International Vacuum Electronics Conference, IVEC 2017, organized and sponsored by the European Space Agency (ESA) with the Technical co‐sponsorship of IEEE Electron Devices Society (EDS), that will be held 24 - 26 April 2017 in the city of London, UK.
IVEC was originally created in 2000 by merging the US Power Tubes Conferences and the European Space Agency TWTA Workshops, and has now expanded to a fully international conference, being held every other year in the USA, and in Europe and Asia alternately every fourth year. After an exciting IVEC in Monterey, USA, in 2016, IVEC’17 returns to Europe to the marvellous city of London (UK). You can learn more about IVEC by visiting VacuumElectronics.org, the IEEE EDS Vacuum Electronics Technical Committee website.
IVEC 2017 aims at being an international forum of information and technical discussion between the various players in the field of vacuum electronics: designers, researchers, young and experienced engineers, scientists, device users, manufacturers, operators, government/institutions, academics and, of course, our valuable students. Therefore, we invite you to submit papers with the results of your work and experiences in the field of vacuum electronics. Submissions from all groups are highly encouraged and appreciated. IVEC 2017 will provide a unique place for the exchange of scientific and technical information and will foster collaboration and cooperation in the vacuum electronics domain both at European and worldwide level.
Linear theory methods of the coupled spacecharge waves for copropagating electron beams considering coefficients of electron interaction and a reduction of plasma oscillations are developed. Interaction of copropagating electron beams promising to amplification of microwaves in electron mode regimes to create devices of millimeter and submillimeter wavelength ranges. Equations of the coupled waves are written down and solutions of the dispersive equation in coupling regime of three and four waves are received. Large signal modes are investigated within model of large particles which has carried out the trajectory analysis of interaction processes of two copropagating electron beams with differ energy. Features of interaction modes with the gain and no gain waves are considered.
Spatially distributed generators on electron-oscillator flows are promising for high-power microwave radiation. In the case of multibeam generator output microwave energy of each beam can be made via antenna assemblies that determine the polarization of the field including a linear polarization in one direction of the coordinate axes. By the method of the non-linear nonstationary theory developed the discrete model of the multibeam microwave generator based on use of the equivalent self-oscillators with slowly varying amplitudes and phases. Formation of an antenna radiation field in three-dimensional approximation on the example of cylindrical ring system of radiators is considered. Each ring consists of a large number dipoles oriented in the longitudinal direction.
As part of simplified three-dimensional problem studied the self-excitation of the finite portion of the active medium on electron-oscillator flows at centrifugal electrostatic focusing. In addition to the study of the transverse motion of the electrons in each ensemble considered longitudinal movement and interaction of a large number of ensembles displaced in the longitudinal direction. Radiative interaction in multibeam microwave generator with electron-oscillators held by centrifugal electrostatic focusing leads to phase self-focusing in ensembles of oscillators and to rise of the dipole moment of the system over time. In the presence of feedback across the field this process leads to self-excitation of the small volumes of the active resonant medium and obtaining stationary generation. The impact of noise on the input of a flow determines the width of the spectral line. Radiative coupling of individual generators accompanied by their mutual synchronization and narrowing of a range of radiation.
In this paper, dispersion characteristics of "serpentine”-type slow-wave structures, which are promising for the terahertz range use, are calculated. For 3D-modeling, HFSS was used. Program described in work was used in the calculation. Using the obtained characteristics, octopole chain model of the slow-wave structure is constructed. Discrete approach is advisable in solving these problems. Justification of the applied mathematical model for the discrete interaction follows from the difference form of electrodynamic theory of excitation . Requirements to coefficients of the resulting finite-difference equation are high, because their accuracy determines how close the mathematical model of the discrete interaction to the physical laws is. These coefficients have a certain electrodynamic sense and are obtained through the octopole transmission matrix coefficients. In turn, this octopole is a mathematical model of the resonator slow-wave structure cell.