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Radiophysics and Quantum Electronics最新文献

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Signals Scattered in the Main and Back Lobes of the Antenna Pattern of ISTP SB RAS Coherent Scatter Radars isp SB - RAS相干散射雷达天线方向图主、后瓣散射信号
IF 0.7 4区 地球科学
Radiophysics and Quantum Electronics Pub Date : 2026-03-20 DOI: 10.1007/s11141-026-10458-y
O. I. Berngardt, R. R. Fedorov
{"title":"Signals Scattered in the Main and Back Lobes of the Antenna Pattern of ISTP SB RAS Coherent Scatter Radars","authors":"O. I. Berngardt,&nbsp;R. R. Fedorov","doi":"10.1007/s11141-026-10458-y","DOIUrl":"10.1007/s11141-026-10458-y","url":null,"abstract":"<p>Based on the analysis of data from two coherent scatter radars of the Institute of Solar–Terrestrial Physics of the Siberian Branch of the Russian Academy of Sciences (ISTP SB RAS), we show that these radars record a significant (up to 35%) number of signals coming from the back lobe of the antenna pattern, which had not been previously taken into account in automatic data processing. The complexity of such analysis is due to the uncertainty in calculating the elevation angle of the received signals (the spacing between two linear antenna arrays exceeds the wavelength of the radio wave). In this paper, we discuss a fast and simple method for detecting such back lobe signals that is based on threshold processing of the elevation angle of the received radio waves. The optimal threshold elevation angle that minimizes the errors in separating signals into mainlobe and back lobe ones is calculated on the basis of modeling and the Bayesian approach. This elevation angle is 28° for the EKB radar and 38° for the MAGW radar. The presence of the effect and its significance at the MAGW radar have been proven to the first time by direct measurementsof the elevation angle using a specially deployed antenna array perpendicular to two other antenna arrays of the radar. The optimality of the threshold elevation angle has been proven for the first time by a ray tracing analysis of all the signals observed by the radars in 2021, rather than only ground backscatter signals, which are commonly used. Based on these experimental results it has been proven for the first time that the found threshold elevation angle is the optimal angle for separating signals into interpretable and uninterpretable from the point of view of radio wave propagation in the main beam. Statistics of observations of signals outside the main lobe of the antenna pattern of the MAGW and EKB ISTP SB RAS radars are presented for the first time.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 4","pages":"286 - 299"},"PeriodicalIF":0.7,"publicationDate":"2026-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147636906","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
A Calculation of the Surface Current and Radiation Field of an Ideal Half-Plane Excited by a Slot Perpendicular to its Edge 垂直于狭缝激励的理想半平面表面电流和辐射场的计算
IF 0.7 4区 地球科学
Radiophysics and Quantum Electronics Pub Date : 2026-02-13 DOI: 10.1007/s11141-026-10454-2
E. I. Nefedov, I. I. Ponomarev, V. P. Zayarnyi, E. S. Semenov
{"title":"A Calculation of the Surface Current and Radiation Field of an Ideal Half-Plane Excited by a Slot Perpendicular to its Edge","authors":"E. I. Nefedov,&nbsp;I. I. Ponomarev,&nbsp;V. P. Zayarnyi,&nbsp;E. S. Semenov","doi":"10.1007/s11141-026-10454-2","DOIUrl":"10.1007/s11141-026-10454-2","url":null,"abstract":"<p>The problem of establishing the relationship between the surface currents and the radiation field of a perfectly conducting half-plane excited by slots of various shapes (constant width, linearly or exponentially expanding, etc.) perpendicular to the edge of the half-plane is solved. The relationships are obtained which allow one to calculate the currents induced on the surface of a half-plane affecting the radiation-field creation. The relationship of the surface currents on the half-plane with radiation patterns (RP) of the corresponding slot antennas (SA) is established. The curves of the surface currents and RP for SA of constant width are calculated on the basis of the obtained formulas. The patterns of variation in the current dependences on the geometric dimensions of the slot and their effect on the corresponding RP were established. It has been shown that experimentally measured RP for similar experimental SA confirm the identified regularities for the corresponding design currents and RP, and make it possible to establish the applicability range for the obtained mathematical models. The SA studies were carried out in the frequency range 8–12 GHz (the average frequency is 10 GHz). The validity of the obtained models in this frequency range is shown.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 3","pages":"231 - 240"},"PeriodicalIF":0.7,"publicationDate":"2026-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147338804","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
Radical Acceleration of the Method for Synthesizing Waveguide Emitters of Gyrodevices Based on the Iterative Physical Optics Method 基于迭代物理光学法合成陀螺器件波导发射器方法的径向加速
IF 0.7 4区 地球科学
Radiophysics and Quantum Electronics Pub Date : 2026-02-13 DOI: 10.1007/s11141-026-10451-5
A. P. Gashturi, G. G. Denisov, D. I. Sobolev
{"title":"Radical Acceleration of the Method for Synthesizing Waveguide Emitters of Gyrodevices Based on the Iterative Physical Optics Method","authors":"A. P. Gashturi,&nbsp;G. G. Denisov,&nbsp;D. I. Sobolev","doi":"10.1007/s11141-026-10451-5","DOIUrl":"10.1007/s11141-026-10451-5","url":null,"abstract":"<p>We present a modification of the method for synthesizing the surface of waveguide transducers, which are developed at the Institute of Applied Physics of the Russian Academy of Sciences (IAP RAS), in combination with solving of a system of scalar integral equations for the surface electric current. Since the synthesis procedure operates on the components of the electromagnetic field on the surface, which are unambiguously related to the current, the specified equations are integrated into it seamlessly. The equations are derived from the original vector integral equation of iterative physical optics, which is a method for analysis of electromagnetic fields in oversized systems, for a waveguide with a smooth wall deformation. The method is used in the calculation of high-power microwave devices (gyrotrons) and for the synthesis of waveguide emitters that convert the high-frequency operating mode into a quasi-Gaussian field distribution at the output by using a smooth shallow deformation of the waveguide. The possibility of significantly accelerating the synthesis while maintaining the high efficiency of the obtained profile is shown using the example of an emitter operated at a frequency of 184 GHz with the TE<sub>28.13</sub> mode.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 3","pages":"205 - 208"},"PeriodicalIF":0.7,"publicationDate":"2026-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147338806","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
Conversion of Intense Laser Pulses to Electromagnetic Fields of Terahertz and Sub-Terahertz Ranges Using Extended Targets 利用扩展目标将强激光脉冲转换为太赫兹和次太赫兹范围的电磁场
IF 0.7 4区 地球科学
Radiophysics and Quantum Electronics Pub Date : 2026-02-13 DOI: 10.1007/s11141-026-10453-3
N. D. Bukharskii, Ph. A. Korneev
{"title":"Conversion of Intense Laser Pulses to Electromagnetic Fields of Terahertz and Sub-Terahertz Ranges Using Extended Targets","authors":"N. D. Bukharskii,&nbsp;Ph. A. Korneev","doi":"10.1007/s11141-026-10453-3","DOIUrl":"10.1007/s11141-026-10453-3","url":null,"abstract":"<p>We consider effects leading to the generation of quasi-stationary fields and radiation of electro-magnetic waves during the propagation of an optically excited discharge pulse in extended targets. The results of numerical simulation are presented for the interaction of an ultrashort laser pulse of relativistic intensity with an extended dense target and for the transformation of this pulse into a powerful discharge current pulse. It is shown that, under certain conditions, such a pulse can be used to generate strong electromagnetic fields with specified spatiotemporal properties. Particular attention is paid to the influence of parameters of the discharge pulse on the properties of the induced electromagnetic fields. Analysis of the discharge-pulse profile as a function of the target thickness is provided and the dynamics of the evolution of the discharge-pulse profile on a time scale of about ∼ 10 ps, when the distance traveled by the pulse along an extended target is of the order of 3 mm, is studied.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 3","pages":"218 - 230"},"PeriodicalIF":0.7,"publicationDate":"2026-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147339091","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
Relativistic Gyrotron with Coupled Mode-Transforming Cavities, Working at the Third Cyclotron Harmonic 在第三次回旋加速器谐波下工作的耦合模变换腔的相对论回旋加速器
IF 0.7 4区 地球科学
Radiophysics and Quantum Electronics Pub Date : 2026-02-13 DOI: 10.1007/s11141-026-10450-6
E. V. Ilyakov, Yu. K. Kalynov, I. S. Kulagin, N. A. Zavolsky, Yu. D. Grom, V. N. Manuilov, A. S. Shevchenko
{"title":"Relativistic Gyrotron with Coupled Mode-Transforming Cavities, Working at the Third Cyclotron Harmonic","authors":"E. V. Ilyakov,&nbsp;Yu. K. Kalynov,&nbsp;I. S. Kulagin,&nbsp;N. A. Zavolsky,&nbsp;Yu. D. Grom,&nbsp;V. N. Manuilov,&nbsp;A. S. Shevchenko","doi":"10.1007/s11141-026-10450-6","DOIUrl":"10.1007/s11141-026-10450-6","url":null,"abstract":"<p>We present the results of calculating and studying experimentally a gyrotron working at the third harmonic of the cyclotron frequency. It used an electron-optical system that generated an electron beam with a particle energy of 280 keV and a current of up to 50 A. Coupled cavities with mode transformation were used as a selective element. The pulsed output power of the gyrotron radiation reached 0.8 MW at a frequency of 80 GHz with an efficiency of about 14%. The generation power was limited by a microwave breakdown in the first section of the cavity.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 3","pages":"195 - 204"},"PeriodicalIF":0.7,"publicationDate":"2026-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147338803","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
Torsional Alfvén Oscillation in the Firehose-Instability Regime as a Mechanism of Plasma Stratification in a Laboratory Experiment Modeling a Coronal Arch 在模拟冠状拱的实验室实验中，火管不稳定状态下的扭转alfv<s:1>振动作为等离子体分层的机制
IF 0.7 4区 地球科学
Radiophysics and Quantum Electronics Pub Date : 2026-02-13 DOI: 10.1007/s11141-026-10448-0
S. A. Koryagin, M. E. Viktorov
{"title":"Torsional Alfvén Oscillation in the Firehose-Instability Regime as a Mechanism of Plasma Stratification in a Laboratory Experiment Modeling a Coronal Arch","authors":"S. A. Koryagin,&nbsp;M. E. Viktorov","doi":"10.1007/s11141-026-10448-0","DOIUrl":"10.1007/s11141-026-10448-0","url":null,"abstract":"<p>The compact laboratory setup “Solar Wind” (IAP RAS) forms an arch-shaped structure of the coronal-loop type, in which the plasma pressure varies from zero to values of the order of or above the magnetic pressure. The arc discharge at each footpoint of the magnetic tube creates a plasma characterized by a significantly higher ion temperature along the magnetic field line than across it. In the stationary state (when the ion pressure remains below the threshold for rupture of the system at the loop apex), the plasma is found to be stratified either as a cylindrical layer along the outer wall of the tube or, possibly, as two belts along the upper and lower vaults of the arch. The paper discusses the excitation of a torsional Alfvén oscillation in the loop under firehose-instability conditions. In the case of rapid growth (with an increment on the order of the ion cyclotron frequency), the unstable Alfvén oscillation substantially redistributes particles between the central axis and the tube wall, manifesting itself as the observed cylindrical layer.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 3","pages":"165 - 182"},"PeriodicalIF":0.7,"publicationDate":"2026-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147338802","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
Peculiarities of Modeling of Propagation of HF Radio Waves Along a Long Path When Recording Z Structures Caused by Traveling Ionospheric Disturbances on Oblique Sounding Ionograms 斜测电离层扰动引起的Z结构记录高频无线电波沿长路径传播的建模特点
IF 0.7 4区 地球科学
Radiophysics and Quantum Electronics Pub Date : 2026-02-13 DOI: 10.1007/s11141-026-10449-z
N. A. Semenova, F. I. Vybornov, S. M. Grach
{"title":"Peculiarities of Modeling of Propagation of HF Radio Waves Along a Long Path When Recording Z Structures Caused by Traveling Ionospheric Disturbances on Oblique Sounding Ionograms","authors":"N. A. Semenova,&nbsp;F. I. Vybornov,&nbsp;S. M. Grach","doi":"10.1007/s11141-026-10449-z","DOIUrl":"10.1007/s11141-026-10449-z","url":null,"abstract":"<p>We present the results of modeling of propagation of HF radio waves on the Cyprus—Nizhny Novgorod path during recording of traveling ionospheric disturbances (TIDs) manifested on the distance–frequency characteristic as <i>z</i>-structures. The ray paths of waves propagating in a smoothly inhomogeneous magnetized ionospheric plasma were calculated for the conditions of experiments conducted in the summer of 2023. The model disturbance of the ionospheric electron density profile during the passage of a TID was specified as a periodic structure with a certain number of periods, which was simulated by a harmonic function exponentially limited in altitude. The model parameters were selected by the best match between the modeling results (calculated distance–frequency characteristics (DFCs)) and the experimentally recorded DFCs of oblique ionospheric sounding.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 3","pages":"183 - 194"},"PeriodicalIF":0.7,"publicationDate":"2026-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147338805","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
Generation of a Frequency-Tunable Signal by Stimulated Backscattering on a Weakly-Relativistic Electron Beam with Controlled Energy Changes 控制能量变化的弱相对论电子束受激后向散射产生频率可调信号
IF 0.7 4区 地球科学
Radiophysics and Quantum Electronics Pub Date : 2026-02-13 DOI: 10.1007/s11141-026-10452-4
L. A. Yurovsky, N. S. Ginzburg, I. V. Zotova, M. N. Vilkov
{"title":"Generation of a Frequency-Tunable Signal by Stimulated Backscattering on a Weakly-Relativistic Electron Beam with Controlled Energy Changes","authors":"L. A. Yurovsky,&nbsp;N. S. Ginzburg,&nbsp;I. V. Zotova,&nbsp;M. N. Vilkov","doi":"10.1007/s11141-026-10452-4","DOIUrl":"10.1007/s11141-026-10452-4","url":null,"abstract":"<p>We study the possibility of using the mode of stimulated backscattering on a weakly relativistic electron beam with a variable energy to implement a frequency modulator in the subterahertz frequency range. It is shown that of the two mechanisms of saturation of the scattered-wave amplitude growth, which are pumping depletion and nonlinear effects in the electron bunching, the second mechanism is dominant for at the reasonably practical parameters of the pump and the electron beam. It is demonstrated that when using a 100 kW/300 GHz gyrotron as a pump wave source, it is possible to generate a signal tunable in the range from 200 to 205 GHz, with a power exceeding 10 kW. Such a modulator may be of interest for various applications, including hyperfine positronium splitting spectroscopy.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 3","pages":"209 - 217"},"PeriodicalIF":0.7,"publicationDate":"2026-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147338807","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
Radiation from a Particle Bunch with Both Charge and Velocity Varying in Time 电荷和速度随时间变化的粒子束的辐射
IF 0.7 4区 地球科学
Radiophysics and Quantum Electronics Pub Date : 2026-01-28 DOI: 10.1007/s11141-026-10439-1
A. V. Tyukhtin
{"title":"Radiation from a Particle Bunch with Both Charge and Velocity Varying in Time","authors":"A. V. Tyukhtin","doi":"10.1007/s11141-026-10439-1","DOIUrl":"10.1007/s11141-026-10439-1","url":null,"abstract":"<p>We study the radiation from a small particle bunch with a time-dependent charge, moving in a nondispersive medium. Approximate expressions for the field components, valid in the radiation zone, are obtained for arbitrary time-dependent charge and velocity of the bunch. The energy characteristics of radiation from a time-dependent charge moving at constant velocity are compared with those of radiation from a constant charge undergoing acceleration.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 1","pages":"65 - 75"},"PeriodicalIF":0.7,"publicationDate":"2026-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147342436","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
Compact Gyrotron with an Axis-Encircling Electron Beam 具有绕轴电子束的紧凑回旋管
IF 0.7 4区 地球科学
Radiophysics and Quantum Electronics Pub Date : 2026-01-27 DOI: 10.1007/s11141-026-10442-6
V. E. Zapevalov, A. S. Zuev, O. P. Plankin, E. S. Semenov
{"title":"Compact Gyrotron with an Axis-Encircling Electron Beam","authors":"V. E. Zapevalov,&nbsp;A. S. Zuev,&nbsp;O. P. Plankin,&nbsp;E. S. Semenov","doi":"10.1007/s11141-026-10442-6","DOIUrl":"10.1007/s11141-026-10442-6","url":null,"abstract":"<p>We present a new version of the gyrotron with an axis-encircling beam. In the new gyrotron, unlike the conventional large orbit gyrotron (LOG), non-adiabatic effects are not used to form an axis-encircling helical electron beam. Thus, a conventional magnet with a quasi-dipole field distribution can be employed here. The main feature of the proposed type of gyrotron is the breaking of the azimuthal symmetry of the electron–optical system. This modification can significantly reduce the cost and sizes of the gyrotron setup due to the use of compact magnet systems with a significantly smaller passage hole diameter. The output radiation power of the “compact” gyrotron is sufficient for spectroscopic applications of gyrotrons. Examples of a compact gyrotron with radiation frequencies of 395 and 593 GHz are given.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 2","pages":"98 - 108"},"PeriodicalIF":0.7,"publicationDate":"2026-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147342738","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
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