Papers by Gennadiy Churyumov
New Trends in Physical Science Research Vol. 6
Journal of Physics: Conference Series, 2022
This paper presents the simulation results of the oscillation modes excited in the interaction sp... more This paper presents the simulation results of the oscillation modes excited in the interaction space of an anode block of a magnetron and the azimuthal distributions of a longitudinal electric component of the RF field for either of the excited modes. Using CST code, there were considered available anode blocks with different configurations of the resonators: a rising sun anode block and a rising sun hole-and-slot anode block. The dispersion characteristics and distributions of the azimuthal components of the RF field for different geometrics of their cavities as applied to the X- and Ku-bands are given. The condition of acceptable separation both in frequency and in phase velocity between the operating JV/2 -mode (or 7T-mode) and neighboring (JV/2 - l)-mode has been determined. It suggested that the mechanism of forming the total RF field connects with possible interference of the RF fields excited severally in the resonant system consisting of the small and large cavities. The fea...
Microwave Heating - Electromagnetic Fields Causing Thermal and Non-Thermal Effects, 2021
In this chapter, the results of theoretical and experimental studies of the interaction of an ele... more In this chapter, the results of theoretical and experimental studies of the interaction of an electromagnetic field with a plasma (fundamental interaction of the wave-particle type) both in the regime of standing waves (in the case of a resonator) and in the case of traveling waves in a waveguide are presented. The results of computer modeling the distribution of a regular electromagnetic field for various designs of electrodynamic structures are considered. The most attractive designs of electrodynamic structures for practical application are determined. A brief review and analysis of some mechanisms of stochastic plasma heating are given as well as the conditions for the formation of dynamic chaos in such structures are determined. Comparison analysis of microwave plasma heating in a regular electromagnetic field (in a regime with dynamical chaos) with plasma heating by random fields is considered. It is shown, that stochastic heating of plasma is much more efficient in comparison...
2019 International Vacuum Electronics Conference (IVEC), 2019
A possible scenario of forming the re-entrant electron cloud in a cold cathode magnetron at the f... more A possible scenario of forming the re-entrant electron cloud in a cold cathode magnetron at the front of anode voltage impulse is considered. The role of the RF fields of the low-voltage modes is shown as well as their influence on the secondary emission mechanism of space charge accumulation at the front of the anode voltage impulse have been refined.
2019 IEEE 2nd Ukraine Conference on Electrical and Computer Engineering (UKRCON), 2019
A novel design of autophase traveling wave tube for operation in amplification and electromagneti... more A novel design of autophase traveling wave tube for operation in amplification and electromagnetic energy reverse conversion modes is described. Independent supply of electromagnetic energy into bunching section and autophase section is proposed, implementation of bunching section as a section of backward wave tube is examined. This allows switching from amplification mode to reverse conversion mode simply by changing the sign of the electric field in autophase section. A version of the device with multiple energy inputs/outputs in the autophase section is also proposed. Simulation results of the proposed design are presented.
2018 IEEE Second International Conference on Data Stream Mining & Processing (DSMP), 2018
This paper analyzes the current state of the problem of obtaining and processing big data streams... more This paper analyzes the current state of the problem of obtaining and processing big data streams by a group of mobile technical objects (drones) under the influence of powerful electromagnetic field. Recommendations regarding to the design of mobile systems characterized by increased survivability are given.
This article presents a design of the low-voltage ${K}_{u}$ -range magnetron with two outputs of ... more This article presents a design of the low-voltage ${K}_{u}$ -range magnetron with two outputs of energy: an active with matched load and a passive that is matched with a load having reactive impedance and providing frequency tuning (or its adjustment). Studying the magnetron is carried out in continuous and pulsed modes under the following input operating parameters: an operating anode voltage varied in a range of 450–500 V, a magnetic field of 0.25 T, a pulse length of 5–20 $\mu $ s, a pulse repetition rate between 100 and 300 Hz, and the magnetron weight ~0.85 kg subject to air cooling. The results of computer modeling the mode spectrum of a cold resonant anode block of the magnetron show that the separation between the operating N/2-mode and the closest low-voltage (N/2-1)-mode is ~1.6 GHz. Under these conditions, it is shown that the maximum frequency tuning of the cold resonant anode block is ~250 MHz. It is shown that the results of experimental studies of frequency tuning in ...
The paper discusses a combined solar simulator, consisting of an electrodeless sulfur lamp with m... more The paper discusses a combined solar simulator, consisting of an electrodeless sulfur lamp with microwave excitation and a halogen lamp. It is shown that the emission spectrum of such a design of the combined solar simulator is closest to the spectral distribution of solar radiation in the wavelength range of 400 … 1100 nm and has an increased service life compared to the solar simulator based on a xenon arc lamp. The spectral irradiance data of the solar simulator based on ASTM E927-10 in the wavelength range of 400 … 700 nm have been measured. An excellent correspondence has been found between the observed results and existing spectral distribution of sunlight in the visible optical range at the level of AM 1.5G in according to standard ASTM G173-03.
Proceedings 17th International Conference on Microwave and High Frequency Heating, Sep 9, 2019
Advanced Information Systems
The subject matter is analysis and evaluation of efficiency of noise-like signals in wireless inf... more The subject matter is analysis and evaluation of efficiency of noise-like signals in wireless information transmission systems. The aim is quality of service improvement for mobile subscribers, due to communication channel multiplexing using complex signal-code structures. The objective is development of a systemic view of the technology of information transmission using ultra-short pulse signals focusing on main phenomena that arise at different stages of signal transmission in a wireless information transmission system. The methods use dare sequential analysis, simulation modeling and digital signal coding. The following results have been obtained. An antenna design featuring an expanding slit has been proposed for effective emission and reception of noise-like signals. A method for controlling radiation pattern of such antenna array has been developed. Gaussian Monocycle coding of information with time position-pulse modulation has been justified to be used as a noise-like signal. It has been shown that for the organization of independent channels in one frequency band, it is practical to use a system of orthogonal codes, e.g. Walsh sequence. Due to accumulation of pulses of a useful information signal in the receiver correlator, significant increase in signal-to-noise ratio becomes possible, which enables information transmission over a wide frequency range well below the noise level. As a result, a systematic understanding of the technology of information transmission using ultra-short pulse signals in wireless information transmission systems is developed and a quantitative evaluation of the efficiency of the proposed technical solutions is provided. Conclusion. The use of noise-like signals in wireless information transmission systems provides for high data transmission rates with high interference immunity and tapping protection communication channel. The ability to operate with low emitted power and the high penetrability of noise-like signals through various obstacles, for example, walls, allow meeting the requirements for electromagnetic compatibility and ensuring stable communication in conditions of multipath propagation of radio waves. These circumstances form the basis for the development and implementation of information transfer technology using noise-like signals when designing office networks.
2016 9th International Kharkiv Symposium on Physics and Engineering of Microwaves, Millimeter and Submillimeter Waves (MSMW), 2016
Electromagnetic Fields and Waves [Working Title]
This chapter contains new simulation results concerning the physical foundations of how microwave... more This chapter contains new simulation results concerning the physical foundations of how microwave tubes operate based on Cherenkov's mechanism of radiation (interaction with slow electromagnetic wave) and some experimental results connected with improving the output characteristics of the magnetrons (a mm band surface wave magnetron and a magnetron with two RF outputs of energy), as well as results of computer modeling of a 320-GHz band traveling wave tube (TWT). The results of analytical calculations and computer modeling, a phase bunching process in the mm band surface wave magnetron, are considered. It is shown that the process of phase focusing has two features associated with a concentration of RF wave energy close to the vanes of an anode block and higher electron hub of a space charge as compared to the classical magnetrons. The features and examples of practical application of the magnetron with two RF outputs of energy are presented. It is shown that the main advantage of the magnetrons is its extended functionalities (for example, possibility of frequency tuning including electronic tuning of a frequency from a pulse to pulse). The presented materials will be of interest not only for starting researchers but also for those who have microwave tube experience.
Emerging Microwave Technologies in Industrial, Agricultural, Medical and Food Processing
Nowadays, electrodeless sulfur lamps with microwave excitation (ESLME) are finding ever-widening ... more Nowadays, electrodeless sulfur lamps with microwave excitation (ESLME) are finding ever-widening application in energy-efficiency lighting systems. A reason of increased interest to these lamps is due to high values of their parameters including a high light flux (120-145 klm), a light intensity (~ 9000 cd), a high value of light output (80-110 lm/W), color rendition coefficient (Ra ~ 90), as well as an application of environmentally friendly materials (argon and sulfur). This chapter presents a novel approach of creating an energy-efficiency lighting source on the basis of the ESLME. For an electrodynamic structure of the lighting system, one can propose to use an optically transparent (mesh) waveguide instead of a microwave cavity. It is shown that the use of proximity of the spectra of optical radiation generated by the sulfur lamp and solar radiation allows more efficiently (in comparison with other light sources) their application as the simulators of sunlight for testing photoelectric converters and solar cells. For extending application of the lighting systems on the basis of the sulfur lamp and further increasing an energy efficiency of these systems, their integration with other electron devices (for example, solar cells) is proposed.
2016 IEEE International Vacuum Electronics Conference (IVEC), 2016
This paper presents the experimental and theoretical investigations of the two constructions of t... more This paper presents the experimental and theoretical investigations of the two constructions of the magnetrons: the low-voltage X and Ku ranges magnetrons with two RF outputs of energy and the cold secondary emission cathode magnetron with ancillary side cold cathode. It is shown that the electronic frequency tuning in the magnetrons with two RF output can be obtained in the range more than 200 MHz. The electronic control of the frequency tuning from pulse to pulse is performed by the microwave switch on basis the p-i-n diodes. By using the computer modeling, the features of secondary emission multiplication mechanism of the electron beam at the front and droop of anode voltage pulses are shown. The prospects for developing such magnetrons and expansion of areas of their application are discussed.
2016 International Conference Radio Electronics & Info Communications (UkrMiCo), 2016
IEEE Transactions on Plasma Science, 2000
Rigorous 3-D finite-difference time-domain computer simulations are used to investigate the elect... more Rigorous 3-D finite-difference time-domain computer simulations are used to investigate the electromagnetic characteristics of the diffraction output of a millimeter (mm)wave-band relativistic magnetron. In the simulations, the diffraction output is outfitted with a dielectric grating that can be tuned in either reflection or transmission mode at definite operation wavelengths. This grating acts as a tunable filter of high-power oscillations generated by the magnetron and is similar to gratings widely used in optics to control ultrashort power optical pulses. Specifically, computer simulations establish a relation between the generation wavelength of the magnetron and the configuration of the grating, as well as predict that the grating provides the field reduction of up to −40 dB. The application of the grating suggests an approach to spectral measurements of mm-wave-band relativistic magnetrons with a measurement accuracy of better than 0.3 mm. The implementation of the approach solves a series of engineering and metrological problems arising during spectral measurements of a variety of high-power vacuum microwave devices.
IEEE Transactions on Electron Devices, 2016
2014 IEEE 41st International Conference on Plasma Sciences (ICOPS) held with 2014 IEEE International Conference on High-Power Particle Beams (BEAMS), 2014
2016 13th International Conference on Modern Problems of Radio Engineering, Telecommunications and Computer Science (TCSET), 2016
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Papers by Gennadiy Churyumov