A. G. Sazontov

Institute of Applied Physics

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N. K. Vdovicheva

Institute of Applied Physics

ИП

И. П. Смирнов

Nizhny Novgorod State Technical University

АИ

А. И. Малеханов

Institute of Applied Physics

V. E. Semenov

Institute of Applied Physics

E. Yu. Gorodetskaya

Institute of Applied Physics

M. Lisak

Chalmers University of Technology

J. Puech

Centre National d'Études Spatiales

L. Lapierre

Laboratoire d'Informatique, de Robotique et de Microélectronique de Montpellier

E. Rakova

Institute of Applied Physics

V. A. Sazontov

Institute of Applied Physics

Cooperative Institutions

Institute of Applied Physics

Russian Academy of Sciences

N. I. Lobachevsky State University of Nizhny Novgorod

Chalmers University of Technology

Yaroslav-the-Wise Novgorod State University

Centre National d'Études Spatiales

Saratov State University

Institute for Physics of Microstructures

Radiophysical Research Institute

XLIM

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Calculation of the degree of coherence and form of a pulse sound signal in an oceanic waveguide with a rough surface

Acoustical Physics (1995)

A. G. Sazontov V. A. Farfel

Degree of coherence

SIGNAL (programming language)

Degree (music)

Waveguide

Rough surface

Source

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Citations (3)

Multipactor discharge on a dielectric surface: Statistical theory and simulation results

Physics of Plasmas (2005)

A. G. Sazontov V. E. Semenov M. Buyanova N. K. Vdovicheva D. Anderson

This paper presents a novel theory for describing the initial stage of a single-surface multipactor discharge on a dielectric surface in the presence of a dc electric field, which returns secondary emitted electrons to the surface. The calculations employ a statistical method based on an exact analytical solution for the probability density of the arrival times of the secondary electrons. A general integral equation determining the steady-state distribution of the emission phases of the secondary electrons and the threshold of the multipactor growth is formulated. A computer program has been developed to implement this theory for realistic secondary yield curves and arbitrary, nonuniform, distributions for velocities and angles of emitted electrons. Susceptibility diagrams, applicable to a wide range of materials, are obtained in terms of the rf and dc electric fields and are found to be relatively independent of the emission distribution of the electrons.

Secondary emission

Secondary electrons

10.1063/1.2011348

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Citations (56)

ACOUSTIC COHERENCE EFFECTS ON LARGE-ARRAY BEAMFORMING IN SHALLOW WATER

E. Yu. Gorodetskaya А. И. Малеханов A. G. Sazontov N. K. Vdovicheva

10.25144/18846

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Citations (0)

Scattering effects on ocean acoustics coherence for low-frequency long-range propagation

Journal de Physique IV (Proceedings) (1994)

A. G. Sazontov V. A. Farfel

Underwater Acoustics

10.1051/jp4:19945248

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Citations (0)

Statistical Prediction of Microwave Window Breakdown: Effects of RF Magnetic Field

IEEE Transactions on Plasma Science (2011)

A. G. Sazontov V. E. Nechaev N. K. Vdovicheva

This paper analyzes the effects of RF magnetic field on the initiation and temporal evolution of multipactor discharge on a dielectric exposed to a linearly polarized electromagnetic wave. It is revealed that the RF magnetic field changes considerably the electron dynamics in the range of small dc fields: It leads to a widening of the susceptibility region and gives the dominant contribution to the total buildup time of the discharge. The nonlinear integral equation for obtaining the saturation level for the given material and velocity spread is formulated.

Saturation (graph theory)

10.1109/tps.2011.2176147

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Citations (12)

Array beamforming in long-range deep-water environments

The Journal of the Acoustical Society of America (1997)

E. Yu. Gorodetskaya А. И. Малеханов A. G. Sazontov N. K. Vdovicheva

Realistic estimations of the deep-water acoustic coherence effects on the array gain for linear and quadratic beamformers, optimal ones included, were obtained for the North-West Pacific environments. An advanced technique was developed to calculate the signal coherence under the basic assumption that the long-range acoustic fluctuations are caused by internal waves in the summer channel or surface wind waves in the winter channel. Simulations were carried out both for horizontal and vertical arrays for the frequency of 250 Hz and ranges 500–1000 km. The following effects were shown to be the most essential points: (i) angular displacement and degradation of the plane-wave beampattern; (ii) large-array gain loss; (iii) coherence-induced gain ‘‘gap’’ between the optimal quadratic and linear beamformers; and (iv) gain dependence on the ambient modal noise. The optimal quadratic beamformer was shown to reduce the gain loss at a cost of increased processor complexity: The number of partial weight-sum channels is equal to the number of the largest signal eigenvalues. In some environments, a proper performance/complexity was realized using suboptimal beamformers which are, therefore, of particular interest for large-array applications. [Work supported by RFBR.]

Array gain

Coherence time

SIGNAL (programming language)

10.1121/1.420890

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Citations (1)

Statistical theory of multipactor discharges between two parallel plates with different emission properties

A. G. Sazontov N. K. Vdovicheva Dan Anderson M. Lisak J. Puech

Statistical Analysis

Source

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Citations (1)

A MULTIPACTOR THRESHOLD IN WAVEGUIDES: THEORY AND EXPERIMENT

NATO science series. Series II, Mathematics, physics and chemistry (2005)

J. Puech L. Lapierre J. Sombrin V. Semenov A. G. Sazontov

Secondary emission

Klystron

10.1007/1-4020-3638-8_23

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Citations (5)

Deep-water acoustic coherence at long ranges: theoretical prediction and effects on large-array signal processing

IEEE Journal of Oceanic Engineering (1999)

E. Yu. Gorodetskaya А. И. Малеханов A. G. Sazontov N. K. Vdovicheva

This paper presents results of combined consideration of sound coherence and array signal processing in long-range deep-water environments. Theoretical evaluation of the acoustic signal mutual coherence function (MCF) of space for a given sound-speed profile and particular scattering mechanism is provided. The predictions of the MCF are employed as input data to investigate the coherence-induced effects on the horizontal and vertical array gains associated with linear and quadratic beamformers with emphasis on the optimal ones. A method of the radiation transport equation is developed to calculate the MCF of the multimode signal under the assumption that internal waves or surface wind waves are the main source of long-range acoustic fluctuations in a deep-water channel. Basic formulations of the array weight vectors and small signal deflection are then exploited to examine optimal linear and quadratic processors in comparison with plane-wave beamformers. For vertical arrays, particular attention is paid also to evaluation of the ambient modal noise factor. The numerical simulations are carried out for range-independent environments from the Northwest Pacific for a sound frequency of 250 Hz and distances up to 1000 km. It was shown distinctly that both signal coherence degradation and modal noise affect large-array gain, and these effects are substantially dependent on the processing technique used. Rough surface sound scattering was determined to cause the most significant effects.

SIGNAL (programming language)

Coherence time

Array Processing

10.1109/48.757268

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Citations (99)

Source Localization in a Range-Dependent Waveguide with Incomplete Information on Spatial Variability of the Propagation Medium

Acoustical Physics (2022)

A. G. Sazontov

Waveguide

SIGNAL (programming language)

Rank (graph theory)

Multiple signal classification

Mode (computer interface)

10.1134/s1063771022060124

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Citations (1)