Radiophysics and Quantum Electronics最新文献_第5页

Modified Spectral Approach with Iterative Refinement of the Boundary Radiation Conditions for Calculation of Linear Active Modes in a Gyrotron 回旋管线性有源模式计算的边界辐射条件迭代改进谱法

IF 0.7 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-04-27 DOI: 10.1007/s11141-026-10477-9

A. B.Adilova, A. G. Rozhnev

{"title":"Modified Spectral Approach with Iterative Refinement of the Boundary Radiation Conditions for Calculation of Linear Active Modes in a Gyrotron","authors":"A. B.Adilova, A. G. Rozhnev","doi":"10.1007/s11141-026-10477-9","DOIUrl":"10.1007/s11141-026-10477-9","url":null,"abstract":"We present a method for numerical modeling of the properties of linear active oscillation modes in gyrotrons, i.e., powerful vacuum generators of electromagnetic waves, which operate in the range from ultra-high to terahertz frequencies. The method is based on the mathematical model of the linear stationary gyrotron theory within the approximation of an unfixed field structure. To formulate a linear spectral problem, we use the method of linearization of the boundary conditions of radiation over the frequency. Using the finite difference method, the boundary value problem is reduced to a linear generalized matrix eigenvalue problem, which is solved by the shift-invert Arnoldi method. An algorithm is proposed for sequentially calculating the spectrum of complex frequencies of linear modes in a gyrotron to find a given number of modes without an additional procedure of searching for initial approximations. The developed technique ensures the calculation of the properties of a given number of linear oscillation modes in a gyrotron, specifically, frequencies, increments (decrements) of instabilities and distributions of the complex field amplitudes, and the current grouped in the electron beam along the cavity. Additionally, the instability boundaries on the plane of the corresponding parameters (starting generation conditions) are calculated. The data of test calculations for an actual gyrotron design are presented. The proposed methods and algorithms will significantly facilitate the process of developing gyrotrons intended for various practical applications.","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 7","pages":"528 - 549"},"PeriodicalIF":0.7,"publicationDate":"2026-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147865740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Minimal Scheme for the Lattice Maxwell Method 晶格麦克斯韦法的最小格式

IF 0.7 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-04-27 DOI: 10.1007/s11141-026-10469-9

A. V. Berezin, V. D. Levchenko, A. Yu. Perepelkina, A. M. Fedotov

引用次数: 0

Passive Microwave Radiometer of the 3-mm Wavelength Range for Routine Observations of Natural Environments 用于自然环境常规观测的3毫米波长范围的被动微波辐射计

IF 0.7 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-04-27 DOI: 10.1007/s11141-026-10474-y

A. V. Filatov, D. A. Pokamestov, Ya. V. Kryukov, A. S. Shinkevich, G. A. Shalin

引用次数: 0

Exoatmospheric Astronomy of Visible, Near- and Middle-Infrared Radiation Bands 可见、近红外和中红外辐射波段的大气外天文学

IF 0.7 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-04-27 DOI: 10.1007/s11141-026-10463-1

V. G. Surdin

引用次数: 0

Ensemble Numerical Experiments with Earth System Models 地球系统模式的集合数值实验

IF 0.7 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-04-27 DOI: 10.1007/s11141-026-10472-0

A. V. Eliseev

引用次数: 0

Simulation of Space-Diversity Reception of Radio Reflections from Meteor Trails 流星尾迹无线电反射的空间分集接收模拟

IF 0.7 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-04-27 DOI: 10.1007/s11141-026-10473-z

A. I. Sulimov, A. I. Karpov, A. O. Savastyanov

{"title":"Simulation of Space-Diversity Reception of Radio Reflections from Meteor Trails","authors":"A. I. Sulimov, A. I. Karpov, A. O. Savastyanov","doi":"10.1007/s11141-026-10473-z","DOIUrl":"10.1007/s11141-026-10473-z","url":null,"abstract":"We present a simulation method for synchronous reception of radio reflections from meteor trails with allowance for the numerical solution to the problem of oblique diffraction of radio waves by meteor ionization trails. Spatial correlation of the characteristics of random wind drift of meteor trails and nonspecular multiple-ionization points scattering from wind-distorted meteor trails is taken into account. A method for statistical modeling of the signal parameters synchronously recorded at two or more spaced receivers is described. Spatial correlation curves of the amplitude–time and phase–time responses of meteor radio reflections are obtained using a simulation approach. It is shown that the coherence radius of the signal amplitude can reach 350–400 km, which is consistent with known theoretical and experimental results. Estimates of the phase coherence radius of meteor radio reflections are made for the first time. It is shown that the phase coherence radius does not exceed 10–15 wavelengths. However, correction of phase measurements for the geometric phase increment and phase addition during radio wave scattering by a meteor trail expands the potential correlation region up to 6–18 km.","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 7","pages":"471 - 490"},"PeriodicalIF":0.7,"publicationDate":"2026-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147865737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nano- and Subnanosecond Electromagnetic Pulses Observed in Experiments with Long Spark Discharges Produced by Impulse Voltage Generators and in a Physical Model of a Thundercloud 在脉冲电压发生器产生的长时间火花放电实验和雷云物理模型中观察到的纳米和亚纳秒电磁脉冲

IF 0.7 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-04-27 DOI: 10.1007/s11141-026-10475-x

I. Yu. Zudin, M. E. Gushchin, Yu. V. Shlugaev, V. S. Syssoev, I. M. Vershinin, E. V. Basov, N. A. Bogatov, A. G. Galka, A. A. Istomin, S. V. Korobkov, K. N. Loskutov, P. A. Mikryukov, A. S. Nikolenko, M. Yu. Naumova, Yu. A. Kuznetsov, A. I. Orlov, E. A. Mareev

{"title":"Nano- and Subnanosecond Electromagnetic Pulses Observed in Experiments with Long Spark Discharges Produced by Impulse Voltage Generators and in a Physical Model of a Thundercloud","authors":"I. Yu. Zudin, M. E. Gushchin, Yu. V. Shlugaev, V. S. Syssoev, I. M. Vershinin, E. V. Basov, N. A. Bogatov, A. G. Galka, A. A. Istomin, S. V. Korobkov, K. N. Loskutov, P. A. Mikryukov, A. S. Nikolenko, M. Yu. Naumova, Yu. A. Kuznetsov, A. I. Orlov, E. A. Mareev","doi":"10.1007/s11141-026-10475-x","DOIUrl":"10.1007/s11141-026-10475-x","url":null,"abstract":"We detect and study the generation of ultrawideband nano- and subnanosecond electromagnetic pulses in various experiments simulating lightning discharges. Ultrawideband electromagnetic pulses with similar characteristics are observed in spark discharges in air gaps from 1 m to 4 m long, which are ignited by impulse voltage generators, as well as in discharges approximately 1 m long, which are caused by a water aerosol cloud charged to a high potential. The experiments show that ultrawideband electromagnetic pulses originate from processes occurring in the near-electrode regions of the discharges, mainly on the cathode side. The pulsed radiation may originate from fast electron avalanches developing, for example, on the cathode of the positive discharge during the initiation of a connecting leader. The ultrawideband electromagnetic pulses observed in the model experiments can be regarded as hazardous lightning factors previously unaccounted for, which can be significant, for example, during the interaction of long spark discharges with various grounded or isolated objects.","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 7","pages":"500 - 514"},"PeriodicalIF":0.7,"publicationDate":"2026-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147865742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Solution to the Problem of Passive Coherent Radar Based on the Results of Measurements by a Single-Position HF Radio Direction Finder 基于单位置高频无线电测向仪测量结果的无源相干雷达问题的解决

IF 0.7 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-04-27 DOI: 10.1007/s11141-026-10476-w

V. Yu. Nesterov, G. G. Vertogradov

引用次数: 0

Common and Distinctive Features of the Methods for Stabilizing the Frequency of a Self-Oscillator by an External Signal and by a Reflected Wave 利用外部信号和反射波稳定自振荡器频率的方法的共同和特点

IF 0.7 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-04-25 DOI: 10.1007/s11141-026-10467-x

Yu. V. Novozhilova, M. I. Petelin, M. Yu. Glyavin, G. G. Denisov, A. P. Fokin

引用次数: 0

Large-Eddy Simulation of a Near-Surface Water Layer Laden With Microbubbles 含微泡的近地表水层大涡模拟

IF 0.7 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-04-25 DOI: 10.1007/s11141-026-10466-y

O. A. Druzhinin

{"title":"Large-Eddy Simulation of a Near-Surface Water Layer Laden With Microbubbles","authors":"O. A. Druzhinin","doi":"10.1007/s11141-026-10466-y","DOIUrl":"10.1007/s11141-026-10466-y","url":null,"abstract":"We perform a large-eddy numerical simulation of a near-surface water layer laden with microbubbles having diameters less than 1 mm in the presence of a specified stationary surface wave in order to investigate the influence of the wave-induced turbulence on the bubble transport. The mathematical model employed is based on solving the three-dimensional equations of the waterphase motion, which are filtered over subgrid fluctuations, in the Eulerian formulation, and the Lagrangian equations of the bubbles motion. The turbulent-viscosity concept, where the kinetic energy of the pulsations unresolved by the calculation grid is determined by solving a prognostic equation, is used to close the subgrid stresses in the water velocity equation. The results show that the influence of the turbulence on the bubble transport leads to a reduction of the transfer of the bubbles, as compared to the Stokes drift, in the vicinity of the water surface, and an enhancement of the transfer in the water depth (i.e., turbulent diffusion of the bubble Stokes drift) occurs. The results also show that the turbulence does not affect significantly the vertical component of the concentration flux, which is controlled by the established bubble velocity in quiescent water.","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 5-6","pages":"391 - 399"},"PeriodicalIF":0.7,"publicationDate":"2026-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147865783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0