Radiophysics and Quantum Electronics最新文献

Influence of Amplitude and Frequency Modulation of the Whistler Wave Packet on Cyclotron Interaction with Energetic Electrons in the Earth’s Magnetosphere 惠斯勒波包的幅频调制对回旋加速器与地球磁层高能电子相互作用的影响

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-08-20 DOI: 10.1007/s11141-026-10496-6

V. S. Grach, A. G. Demekhov

{"title":"Influence of Amplitude and Frequency Modulation of the Whistler Wave Packet on Cyclotron Interaction with Energetic Electrons in the Earth’s Magnetosphere","authors":"V. S. Grach, A. G. Demekhov","doi":"10.1007/s11141-026-10496-6","DOIUrl":"10.1007/s11141-026-10496-6","url":null,"abstract":"We consider the resonant interaction of a whistler-mode wave packet with energetic electrons. The wave packet parameters are based on Cluster spacecraft data. Both model profiles of the packet amplitude and frequency (Gaussian and linear, respectively) and profiles taking into account variations in amplitude and frequency, directly based on spacecraft data, are used. The effect of the wave packet amplitude and frequency modulation on the acceleration of electrons and their precipitation into the loss cone as a result of the interaction is analyzed by using test particle simulations.It is shown that both modulations have a similar effect on the interaction characteristics: the presence of modulation (amplitude and/or frequency) generally significantly increases the probability of particle trapping by the wave field, but the maximum energy gain for trapped particles decreases. However, there are regions of the initial electron parameters in which, even in the presence of modulation, significant acceleration of individual groups of particles is possible. As a result of the interaction considered, electrons with energies of 20 to 200 keV can effectively precipitate into the loss cone. As the packet propagates away from the equator, less effective precipitation of particles with energies of 200 to 600 keV is possible. The precipitation characteristics depend only weakly on the presence of amplitude and/or frequency modulation of the wave packet.","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 10","pages":"743 - 760"},"PeriodicalIF":0.8,"publicationDate":"2026-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148810936","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

Optimization of a Multiple-Pass Gas Cell with Variable Optical Pathlength for a Terahertz Absorption Spectrometer 用于太赫兹吸收光谱仪的可变光程多通气体池的优化设计

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-07-22 DOI: 10.1007/s11141-026-10499-3

G. K. Raspopin, A. V. Borisov, A. G. Pauliš, G. E. Dunaevsky, V. L. Vax, Yu. V. Kistenev

引用次数: 0

A New Type of Artificial Josephson Atoms for Quantum Simulation of Topological Models 用于拓扑模型量子模拟的新型人工约瑟夫森原子

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-07-22 DOI: 10.1007/s11141-026-10501-y

E. E. Konopleva, G. P. Fedorov, O. V. Astafiev

引用次数: 0

A New Aberration Basis for Kolmogorov Wavefronts for Improving Laser Radiation Focusing in Modal Correction 改善激光模态校正中辐射聚焦的Kolmogorov波前像差基础

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-07-22 DOI: 10.1007/s11141-026-10500-z

D. A. Yagnyatinskiy, A. P. Kuznetsov

{"title":"A New Aberration Basis for Kolmogorov Wavefronts for Improving Laser Radiation Focusing in Modal Correction","authors":"D. A. Yagnyatinskiy, A. P. Kuznetsov","doi":"10.1007/s11141-026-10500-z","DOIUrl":"10.1007/s11141-026-10500-z","url":null,"abstract":"We derive a mode basis of aberration components of the Kolmogorov wavefront. The basis is characterized by the maximum contribution to the geometric transverse aberration of a uniformly intense circular monochromatic laser beam. The result represents the Karhunen—Loève functions derived from the Lukosz polynomials. With modal successive correction, subtraction of these components from the wavefront results in the strongest decrease of the RMS focal spot radius, allowing for statistical improvement of the focusing effect of laser radiation. The result obtained within the geometric optics approximation is also valid for the diffraction focal spot. Results of numerical simulation show that the characteristic focal spot size depending on the turbulence level can be reduced by several percent or tens of percent, while the Strehl ratio and the power in the bucket can be increased from several percent to more than a hundred percent (as compared to the modal correction of the same number of the known aberration components). It is also proposed to use modified Karhunen—Loève functions as aberration components, which in most cases allow for higher focusing parameters than those with the newly derived Karhunen—Loève—Lukosz modes. These results can be generalized for any given model of atmospheric phase distortions, an arbitrary aperture shape, and a given laser beam apodization.","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 10","pages":"792 - 810"},"PeriodicalIF":0.8,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148810938","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

Application of Spatial Field Processing Based on the Double Weighted Fourier Transform Method in the Problems of Satellite Diagnostics of the Ionosphere Taking Into Account the Horizontal Drift Velocities of Small-Scale Irregularities 基于双加权傅立叶变换的空间场处理方法在考虑小尺度不规则水平漂移速度的电离层卫星诊断问题中的应用

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-07-22 DOI: 10.1007/s11141-026-10497-5

M. A. Zverev, S. I. Knizhin

{"title":"Application of Spatial Field Processing Based on the Double Weighted Fourier Transform Method in the Problems of Satellite Diagnostics of the Ionosphere Taking Into Account the Horizontal Drift Velocities of Small-Scale Irregularities","authors":"M. A. Zverev, S. I. Knizhin","doi":"10.1007/s11141-026-10497-5","DOIUrl":"10.1007/s11141-026-10497-5","url":null,"abstract":"We study the possibility of using double spatial field processing based on the double weighted Fourier transform (DWFT) method to increase the resolution of satellite diagnostics of an inhomogeneous ionospheric plasma. The case of synthesizing a line of sources of the probing signal by a low-orbiting satellite of the “Ionosphere-M” type is considered. As a model of the ionosphere, an approximation is used in the form of a background medium represented by a simple Chapman layer, with the addition of horizontally moving local plasma irregularities having dielectric permittivity variations in the form of Gaussian functions. Computer calculations of the phase of the field of a wave that has passed through an inhomogeneous medium showed that for the chosen parameters of the problem, the use of double spatial field processing based on the DWFT method makes it possible to overcome the Fresnel resolution limit for diagnosing small-scale ionospheric irregularities moving with horizontal drift velocities less than 200 and 380 m/s for probing-signal frequencies of 150 and 400 MHz, respectively.","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 10","pages":"761 - 772"},"PeriodicalIF":0.8,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148810937","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

On Simulating the Generation of a Ka-Band Subnanosecond Microwave Peak Train by a Relativistic Backward-Wave Oscillator in the Beam Current Modulation Regime 波束电流调制下相对论反向波振荡器模拟ka波段亚纳秒微波峰值序列的研究

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-07-21 DOI: 10.1007/s11141-026-10490-y

L. N. Lobanov, V. V. Rostov, S. A. Shunailov, M. I. Yalandin

{"title":"On Simulating the Generation of a Ka-Band Subnanosecond Microwave Peak Train by a Relativistic Backward-Wave Oscillator in the Beam Current Modulation Regime","authors":"L. N. Lobanov, V. V. Rostov, S. A. Shunailov, M. I. Yalandin","doi":"10.1007/s11141-026-10490-y","DOIUrl":"10.1007/s11141-026-10490-y","url":null,"abstract":"We consider numerical models for generating sequences of subgigawatt microwave superradiance (SR) peaks in a relativistic Ka-band backward-wave oscillator (BWO) due to a deep periodic modulation of the electron beam current. In the first model, this regime is achieved by applying a sequence of trapezoidal accelerating pulses to the explosive-emission cathode with a certain delay. The delay duration determines the influence of the residual background of slow spent electrons on the dynamics of formation of the subsequent SR peak and the peak amplitude. In an alternative model, the injected beam current is continuous, but modulated by the preceding SR pulse, which generates strong electric fields in the radial gap near a coaxial insert used in the anode unit of the BWO instead of the resonant reflector. Here, the beam is periodically dumped onto the wall. In this case, unlike the first model, the electrons at the leading edge of the next beam segment have the maximum energy. Therefore, the excitation of subsequent SR pulses is less sensitive to residual slow electrons and occurs under reproducible conditions. The pulses have a short delay and close amplitudes.","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 9","pages":"677 - 687"},"PeriodicalIF":0.8,"publicationDate":"2026-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752152","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

Experimental Studies of Recognition of Propeller-Modulated Radar Signals Based on the Eigenvalue Analysis of a Sample Correlation Matrix 基于样本相关矩阵特征值分析的螺旋桨调制雷达信号识别实验研究

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-07-21 DOI: 10.1007/s11141-026-10498-4

S. A. Kozlov, O. E. Kudryashova, E. S. Fitasov, A. D. Ilyasafov, A. E. Timofeev

引用次数: 0

Subterahertz Radiometer Modulator Operating in the 1.3 mm Atmospheric Transparency Window 工作在1.3毫米大气透明窗口的亚太赫兹辐射计调制器

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-07-21 DOI: 10.1007/s11141-026-10491-x

V. F. Vdovin, P. M. Zemlyanukha, M. V. Efimova, I. V. Lesnov, M. A. Mansfeld, A. S. Marukhno, K. V. Mineev, V. I. Nosov, V. A. Salkov

引用次数: 0

Pulse-Periodic Relativistic Backward-Wave Oscillator with an Electron Beam Power Conversion Efficiency of 50% 电子束功率转换效率达50%的脉冲周期相对论后向波振荡器

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-07-20 DOI: 10.1007/s11141-026-10488-6

V. V. Rostov, R. V. Tsygankov, P. V. Vykhodtsev, A. N. Sinyakov, A. S. Stepchenko, M. I. Yalandin, A. N. Yunakov

{"title":"Pulse-Periodic Relativistic Backward-Wave Oscillator with an Electron Beam Power Conversion Efficiency of 50%","authors":"V. V. Rostov, R. V. Tsygankov, P. V. Vykhodtsev, A. N. Sinyakov, A. S. Stepchenko, M. I. Yalandin, A. N. Yunakov","doi":"10.1007/s11141-026-10488-6","DOIUrl":"10.1007/s11141-026-10488-6","url":null,"abstract":"We present the results of theoretical and experimental studies of a relativistic backward-wave oscillator in the long-wavelength band of the centimeter-wave range (λ ≈ 10 cm). Using a nonlinear nonstationary model, weshow that the choice of the reduced high-frequency space charge parameter plays an important role in all options for increasing the oscillator efficiency. Numerical simulation using the macro-particle method and the experiments confirm the need to minimize the intense space charge fields. This key parameter decreases due not only to a decrease in the electron beam current, but also to an increase in the maximum transport current through the slow-wave structure of the backward-wave oscillator. This effect is achieved by bringing the electron beam closer to the structure walls in a nonuniform magnetic field. In this approach, partial current deposition on the slow-wave structure in the electron deceleration region has proven beneficial. The experiment employed the pulse-periodic regime of operation of the relativistic backward-wave oscillator with a clock frequency of up to 250 Hz at a carrier frequency of 3 GHz and a power of 1.0±0.1 GW in pulses with a duration of 23±1 ns. The corresponding degree of the beam–to–wave power conversion can exceed 50%.","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 9","pages":"662 - 669"},"PeriodicalIF":0.8,"publicationDate":"2026-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752254","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

Subterahertz Superconducting Oscillators Based on Arrays of Josephson Junction 基于约瑟夫森结阵列的亚太赫兹超导振荡器

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-07-20 DOI: 10.1007/s11141-026-10487-7

F. V. Khan, L. V. Filippenko, A. B. Ermakov, N. V. Kinev, V. P. Koshelets

{"title":"Subterahertz Superconducting Oscillators Based on Arrays of Josephson Junction","authors":"F. V. Khan, L. V. Filippenko, A. B. Ermakov, N. V. Kinev, V. P. Koshelets","doi":"10.1007/s11141-026-10487-7","DOIUrl":"10.1007/s11141-026-10487-7","url":null,"abstract":"For most practical applications of superconducting oscillators, it is necessary to implement terahertz generation with the frequency tuning over a wide range and a narrow radiation line in a single device. Until now, this has been achieved only for systems based on distributed Josephson junctions. We give a brief overview of the main achievements in the field of creating superconducting integrated oscillators and present the results of developing a new type of oscillators based on arrays of Josephson junctions included in a superconducting coplanar line. The implementation of a new type of Josephson junctions has provided the possibility of developing an oscillator with operating frequencies of up to 700 GHz, which are limited only by the energy gap of niobium. The use of a superconducting harmonic mixer based on a superconductor–insulator–superconductor tunnel junction made it possible not only to determine the operating frequency range of the oscillator and estimate its power, but also to measure the radiation linewidth of a superconducting oscillator at frequencies of up to 700 GHz in the frequency-stabilization mode and to implement the phase-locked loop mode. The possibility of developing terahertz-superconducting oscillators for integrated receiving systems of ground-based and space radio-telescopes is discussed.","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 9","pages":"653 - 661"},"PeriodicalIF":0.8,"publicationDate":"2026-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752257","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