Electrodynamic Modeling of Accelerating Cavities

2020 ◽  
pp. 25-61
Author(s):  
N.P. Sobenin ◽  
B.V. Zverev
Keyword(s):  
Accelerating Cavities ◽  
Electrodynamic Modeling

The method of determining the metrological performance of unit reference standards of reflection coefficient in waveguides at millimeter waves

2020 ◽  
pp. 59-63
Author(s):  
A.S. Bondarenko ◽  
A.S. Borovkov ◽  
I.M. Malay ◽  
V.A. Semyonov
Keyword(s):  
Reflection Coefficient ◽  
Millimeter Waves ◽  
Primary Standard ◽  
Reference Standards ◽  
Measurement Scale ◽  
Current State ◽  
Coefficient Measurement ◽  
Mathematical Equations ◽  
Electrodynamic Modeling ◽  
Metrological Performance

The analysis of the current state of the reflection coefficient measurements in waveguides at millimeter waves is carried out. An approach for solving the problem of reproducing the reflection coefficient measurement scale is proposed. Mathematical equations, which are the basis of the reflection coefficient measurement equation are obtained. The method of determining the metrological performance of reflection coefficient unit’s reference standards is developed. The results of electrodynamic modeling and analytical calculations by the developed method are compared. It is shown that this method can be used for reproducing the reflection coefficient unit in the development of the State primary standard.

Mode Damping in NAL Main Ring Accelerating Cavities

1971 ◽  
Vol 18 (3) ◽  
pp. 260-261 ◽  
Author(s):  
R. A. Dehn ◽  
Q. A. Kerns ◽  
J. E. Griffin
Keyword(s):  
Main Ring ◽  
Accelerating Cavities

scholarly journals Field-Enhanced Superconductivity in High-Frequency Niobium Accelerating Cavities

2018 ◽  
Vol 121 (22) ◽  
Author(s):  
M. Martinello ◽  
M. Checchin ◽  
A. Romanenko ◽  
A. Grassellino ◽  
S. Aderhold ◽  
...  
Keyword(s):  
High Frequency ◽  
Accelerating Cavities ◽  
Enhanced Superconductivity

Calculation of the impedance characteristics of a microstrip loop antenna with a metallized dielectric substrate

2021 ◽  
Author(s):  
S.A. Korshunov
Keyword(s):  
Mathematical Models ◽  
Current Density ◽  
Mathematical Problem ◽  
Current Density Distribution ◽  
Dielectric Substrate ◽  
Microstrip Antennas ◽  
Radial Component ◽  
Method Of Integral Equations ◽  
Electrodynamic Modeling ◽  
Rigorous Model

In connection with the intensive development of electronic technology, an urgent task is the development of antennas in a microstrip way, the advantages of which are small dimensions, a relatively simple manufacturing technology, and the ability to control their characteristics by using various materials and forms of radiators in their design. Currently, there are many mathematical models of microstrip antennas with vibrator radiators located on dielectric substrates, while models of microstrip antennas with other radiator shapes are presented much less often. As a rule, the calculation of the characteristics of such antennas is performed in electrodynamic modeling systems based on the use of «closed» algorithms. In this regard, there is a need to develop rigorous mathematical models of microstrip antennas with radiators of various shapes. This work is dedicated to the development of a rigorous model of a microstrip antenna with a frame radiator located on a dielectric substrate, based on the use of the method of integral equations. An integral equation is obtained for the unknown distribution function of the radial component of the current density over a frame radiator, the numerical solution of which is a correct mathematical problem. In addition, the numerical results of calculating the current density distribution, as well as the input impedance of such an antenna for various parameters of the radiator and substrate, are presented.

STUDY OF THE INFLUENCE OF RFID TAG BENDING ON BASIC CHARACTERISTICS

2021 ◽  
pp. 85-89
Author(s):  
С.М. Фёдоров ◽  
Е.А. Ищенко ◽  
Е.В. Папина ◽  
К.А. Бердников ◽  
Ю.Д. Савкина
Keyword(s):  
Flexible Substrate ◽  
Passive Mode ◽  
Rfid Tag ◽  
Active Mode ◽  
Effective Scattering Area ◽  
Frequency Peak ◽  
Detection Mode ◽  
Basic Characteristics ◽  
Electrodynamic Modeling ◽  
Passive Rfid

Рассматривается пассивная радиочастотная метка, которая находится на гибкой подложке, что приводит к появлению проблемы с изменением характеристик при изгибе метки. В процессе исследования производилось моделирование для трех ситуаций: плоской метки, изогнутой внутрь и наружу. Благодаря современным методам электродинамического моделирования возможно определить все основные характеристики RFID метки - в активном режиме: обратные потери, диаграмму направленности; в пассивном режиме: диаграмму обратного рассеяния, токи и напряжения в нагрузке. При моделировании были построены графики зависимости амплитуд токов и напряжений в нагрузке от частоты, пиковые значения эффективной площади рассеяния. Благодаря полученным данным можно определить наиболее оптимальные частоты для облучения RFID метки, чтобы обеспечить ее работу в активном режиме (высокие токи и напряжения в нагрузке), а также в режиме обнаружения - большие значения ЭПР. Приводятся графики и таблицы для сравнения исследуемых случаев, по которым видны изменения характеристик при изгибе метки, что делает невозможным применение системы в широких диапазонах частот, так как стоит учитывать ее возможные изгибы The article discusses a passive RFID tag that sits on a flexible substrate, which leads to a problem with changing characteristics when the tag is bent. In the course of the study, we carried out modeling for three situations: a flat tag, curved inward and outward. Thanks to modern methods of electrodynamic modeling, it is possible to determine all the main characteristics of an RFID tag - in the active mode: return loss, radiation pattern; in passive mode: diagram of backscatter, currents and voltages in the load. During the simulation, we plotted graphs of the dependence of the amplitudes of currents and voltages in the load on frequency, peak values of the effective scattering area. Thanks to the data obtained, it is possible to determine the most optimal frequencies for irradiation of an RFID tag in order to ensure its operation in an active mode (high currents and voltages in the load), as well as in the detection mode - large ESR values. The article provides graphs and tables for comparing the cases under study, which show changes in characteristics when the tag is bent, which makes it impossible to use the system in wide frequency ranges, since its possible bends should be taken into account

Multifrequency optimization method of measurement the frequency dependency of electrophysical parameters of dielectric and magnetodielectric coatings

2021 ◽  
pp. 54-61
Author(s):  
Aleksandr I. Kaz'min
Keyword(s):  
Frequency Dependence ◽  
Radio Wave ◽  
Optimization Method ◽  
Metal Substrate ◽  
Geometric Parameters ◽  
Microwave Range ◽  
Electrodynamic Modeling ◽  
Wave Methods ◽  
Electrophysical Parameters

The issues of experimental determination of electrodynamic parameters of existing and new synthesized materials and coatings used in the microwave range are highlighted. Problems arising from measurements of the electrophysical and geometric parameters of dielectric and magnetodielectric coatings, taking into account their placement on a metal substrate, by radio wave methods are considered. We present the new radio wave method of joint measurements of the frequency dependence of the complex permittivity, the frequency dependence of the complex magnetic permeability, and the thickness of plane-layered samples of dielectric and magnetodielectric coatings on a metal substrate. Determination of electrophysical and geometric parameters of the coating in the proposed method is reduced to minimizing the objective function constructed based on the discrepancy between the experimental and design theoretical values of the attenuation coefficients of surface electromagnetic wave fields on a grid of discrete frequencies. The simulation model of measurements is shown, implemented on the basis of the electrodynamic modeling system CST Microwave studio (Simulia corporation, USA) and the Matlab system. The results of simulation are presented to determine the frequency dependences of the electrophysical parameters and the thickness of a sample of a radio-absorbing coating on a metal substrate. Errors in the estimates of permittivity and permeability in the measurement frequency band 9–13.5 GHz, which are no more than 10 % with a confidence level of 0.95 with a mean square deviation of the noise level of 0.006, have been obtained. The proposed method can be in demand in various science-intensive areas – microelectronic, aerospace, mechanical engineering, etc.

Feeding System of a High-Frequency Accelerating Cavities of the Novosibirsk Microtron-Recovery Unit for The Fel. Divider of a High CW Power on the Basis of a Rectangular Waveguide

2013 ◽  
Vol 8 (1) ◽  
pp. 32-43
Author(s):  
Vladimir Arbuzov ◽  
Eduard Gorniker ◽  
Evgeny Kozyrev ◽  
Alexey Kondakov ◽  
Viktor Petrov ◽  
...  
Keyword(s):  
Rectangular Waveguide ◽  
Current Source ◽  
Coaxial Line ◽  
Design Parameters ◽  
Thz Radiation ◽  
Recovery Unit ◽  
Accelerating Cavities ◽  
Continuous Power ◽  
A Current ◽  
Frequency Power

The article is devoted to the system of the Radio Frequency power transfer and distribution between accelerating cavities of the ERL for FEL of the Siberian center of SR and THz Radiation, SB RAS, Novosibirsk. The system of dividing is built on the basis of a rectangular waveguide, associated with each cavity of a coaxial line by the coaxial-to-waveguide adapter (CWA). It is shown that under a certain choice of waveguide sizes and CWA, the equivalent circuit of the CWA can be represented by a current source. The analysis of the properties of such a system has been carried out and shown its advantages. Also it is discussed the experimental results and the experience of the operation of the device. The article presents the basic design parameters of a waveguide divider 600 kW of continuous power, running at a frequency of 180.4 MHz

Sign in / Sign up

Export Citation Format

Share Document