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Journal articles on the topic 'Beam wave'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Ansari, A., M. S. Patel, S. P. Mishra, Arvind Kumar, Asheel Kumar, and A. Varma. "Excitation of large-amplitude electron plasma wave by counterpropagation of two laser beams in spherical nanoparticles." Laser Physics 35, no. 4 (2025): 045402. https://doi.org/10.1088/1555-6611/adc559.

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Abstract The counterpropagation interaction of two different laser beams with a spherical nanoparticle medium is used to excite a large-amplitude electron plasma wave. The two laser beams having slightly different frequencies cause beat wave generation at the beat wave number k = k 1 + k 2 and beat wave frequency ω = ω 1 − ω 2 . The high-power laser beam radiation ionizes the atoms of the nanoparticles and subsequently converts them into plasma plume balls. The gradient in the field of each laser beam is considered to be responsible for the generation of a nonlinear ponderomotive force to the

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2

Narita, Y., U. Motschmann, H. Comişel, and D. Schmid. "Double Beam Instability for the Mercury Upstream Waves." Astrophysical Journal 983, no. 2 (2025): 125. https://doi.org/10.3847/1538-4357/adc1bc.

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Abstract Mercury shock-upstream region is plasma physically of great interest, as the solar wind plasma may encounter two ion beams, forming a double-beam plasma system. Properties of the double-beam instability are studied semianalytically using the magnetoionic theory (cold plasma waves including beams), such as the unstable mode, the resonance wavenumbers, and the growth rates, for various beam configurations. The cold plasma wave theory supports the idea that both the foreshock ions and the pickup ions can potentially drive the right-hand beam instability, and moreover, the instability may

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3

Ji, Jianyi, Ronghui Wang, Niujing Ma, Kunhong Huang, and Xiang Zhang. "Study of flexural wave propagation through a cable stayed beam subjected to a moving load." Advances in Structural Engineering 25, no. 5 (2022): 1057–71. http://dx.doi.org/10.1177/13694332211063248.

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A physical perspective of the propagation and attenuation of flexural waves is presented in this paper for the dynamic behaviors of cable stayed beams subjected to a moving load. Based on the method of reverberation-ray matrix (MRRM), the waveform solutions of the wave equations of a simplified beam-cable system subjected to a moving load (hereinafter referred to as a beam-cable system) are given, and the theory is verified by a numerical example. The dynamic response of cable stayed beams is decomposed into nine kinds of flexural waves, including traveling waves, near-field waves, and nondisp

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4

Mei, C., and B. R. Mace. "Wave Reflection and Transmission in Timoshenko Beams and Wave Analysis of Timoshenko Beam Structures." Journal of Vibration and Acoustics 127, no. 4 (2004): 382–94. http://dx.doi.org/10.1115/1.1924647.

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This paper concerns wave reflection, transmission, and propagation in Timoshenko beams together with wave analysis of vibrations in Timoshenko beam structures. The transmission and reflection matrices for various discontinuities on a Timoshenko beam are derived. Such discontinuities include general point supports, boundaries, and changes in section. The matrix relations between the injected waves and externally applied forces and moments are also derived. These matrices can be combined to provide a concise and systematic approach to vibration analysis of Timoshenko beams or complex structures

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Singh, Arvinder, and Naveen Gupta. "Beat wave excitation of electron plasma wave by coaxial cosh-Gaussian laser beams in collisional plasma." Laser and Particle Beams 33, no. 4 (2015): 621–32. http://dx.doi.org/10.1017/s0263034615000646.

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AbstractThis paper presents a scheme for beat wave excitation of an electron plasma wave (EPW) by cross-focusing of two intense cosh-Gaussian (ChG) laser beams in an under dense collisional plasma. The plasma wave is generated on account of beating of two ChG laser beams of frequencies ω1 and ω2. Starting from Maxwell's equations, coupled differential equations governing the evolution of spot size of laser beams with distance of propagation have been derived by using Moment theory approach in Wentzel–Kramers–Brillouin approximation. The collisional nonlinearity depends not only on the intensit

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6

HUANG, YEN-CHIEH. "LASER BEAT-WAVE BUNCHED BEAM FOR COMPACT SUPERRADIANCE SOURCES." International Journal of Modern Physics B 21, no. 03n04 (2007): 287–99. http://dx.doi.org/10.1142/s0217979207042069.

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A periodically bunched electron beam is useful for generating high-brightness electron superradiance. This paper studies the generation and acceleration of density-modulated electron beams from a photocathode electron gun driven by a laser beat wave. Computer simulation shows the feasibility of accelerating and preserving the density-modulated electron beam in an accelerator. This paper also details the implementation of a beat-wave laser system with a variable beat frequency for driving a photocathode electron gun.

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7

Zhao, Dong, and Ying Liu. "Effects of director rotation relaxation on viscoelastic wave dispersion in nematic elastomer beams." Mathematics and Mechanics of Solids 24, no. 4 (2018): 1103–15. http://dx.doi.org/10.1177/1081286518773516.

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In this paper, the transverse wave dispersion in a nematic elastomer (NE) Timoshenko beam is studied by considering anisotropy and viscoelasticity of NEs in the low frequency limit. Firstly, the characteristic equations of wave motion in an NE beam are derived, and then numerically solved to obtain the corresponding phase velocities and attenuation factors. The influences of anisotropic parameter, director rotation and rubber relaxation times on the wave dispersion in an NE beam are discussed. Results show that unlike the situation in general isotropic viscoelastic beam, non-classical viscoela

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8

Erofeenko, V. T., and I. S. Kozlovskaja. "Modeling of narrow beams of electromagnetic waves with axial symmetry on a plane." Doklady of the National Academy of Sciences of Belarus 67, no. 1 (2023): 7–13. http://dx.doi.org/10.29235/1561-8323-2023-67-1-7-13.

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A mathematical model of narrow beams of monochromatic electromagnetic waves propagating in vacuum is developed. Beams of electromagnetic waves are constructed with the order of axial symmetry m m( 0,1, 2, ), = K characterized by the beam localization radius Rпуч, the beam narrowness parameter n n( 2), ≥ and the beam attenuation coefficient N N( 2). ≥ The structure of the electric field for a TE-polarized wave beam is studied numerically.

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9

Fitio, Volodymyr, Iryna Yaremchuk, Andriy Bendziak, Michal Marchewka, and Yaroslav Bobitski. "Diffraction of a Gaussian Beam with Limited cross Section by a Volume Phase Grating under Waveguide Mode Resonance." Materials 14, no. 9 (2021): 2252. http://dx.doi.org/10.3390/ma14092252.

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In this work, the diffraction of a Gaussian beam on a volume phase grating was researched theoretically and numerically. The proposed method is based on rigorous coupled-wave analysis (RCWA) and Fourier transform. The Gaussian beam is decomposed into plane waves using the Fourier transform. The number of plane waves is determined using the sampling theorem. The complex reflected and transmitted amplitudes are calculated for each RCWA plane wave. The distribution of the fields along the grating for the reflected and transmitted waves is determined using inverse Fourier transform. The powers of

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10

Lv, Hangyuan, Shangjie Li, Xianzhen Huang, and Zhongliang Yu. "Band-Gap Properties of Finite Locally Resonant Beam Suspended Periodically with Two-Degree-of-Freedom Force Type Resonators." Crystals 11, no. 6 (2021): 716. http://dx.doi.org/10.3390/cryst11060716.

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The propagation properties of waves in finite Timoshenko locally resonant (LR) beams resting on forced vibrations and periodically attached two-degree-of-freedom force-type resonators are studied by the wave-based analysis approach. By calculating the motion equations of the beam, the transmission and reflection matrices of waves at the resonator attached point are first derived, and the forced vibration response of the finite periodic beam is deduced by the wave-based approach. Several examples are also analyzed by the finite element method to verify the high accuracy of the developed wave-ba

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11

Gupta, Ruby, Ved Prakash, Suresh C. Sharma, and Vijayshri. "Interaction of an electron beam with whistler waves in magnetoplasmas." Laser and Particle Beams 33, no. 3 (2015): 455–61. http://dx.doi.org/10.1017/s0263034615000506.

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AbstractThe present paper studies the whistler wave interaction with an electron beam propagating through magnetized plasma. A dispersion relation of whistler waves has been derived, and first-order perturbation theory has been employed to obtain the growth rate of whistlers in the presence of parallel as well as oblique electron beam. For whistler waves propagating parallel to the magnetic field, that is, parallel whistlers, only the cyclotron resonance appears with a parallel beam, while for whistler waves propagating at an angle to the magnetic field, that is, oblique whistlers interaction

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12

Karimi, Hussain H., and T. R. Akylas. "Parametric subharmonic instability of internal waves: locally confined beams versus monochromatic wavetrains." Journal of Fluid Mechanics 757 (September 17, 2014): 381–402. http://dx.doi.org/10.1017/jfm.2014.509.

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AbstractInternal gravity wavetrains in continuously stratified fluids are generally unstable as a result of resonant triad interactions which, in the inviscid limit, amplify short-scale perturbations with frequency equal to one half of that of the underlying wave. This so-called parametric subharmonic instability (PSI) has been studied extensively for spatially and temporally monochromatic waves. Here, an asymptotic analysis of PSI for time-harmonic plane waves with locally confined spatial profile is made, in an effort to understand how such wave beams differ, in regard to PSI, from monochrom

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13

Sharma, Prerana. "Cross Focusing of two Coaxial Gaussian Beams with Relativistic and Ponderomotive Nonlinearity." Zeitschrift für Naturforschung A 67, no. 1-2 (2012): 10–14. http://dx.doi.org/10.5560/zna.2011-0064.

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This paper presents the cross focusing of two high power lasers by taking off-axial contributions of the laser beams in a collisionless plasma. Due to relativistic and ponderomotive nonlinearities the two laser beams affect the dynamics of each other and cross focusing takes place. The expressions for the laser beam intensities by using the eikonal method are derived. The contributions of the r2 and r4 terms are incorporated. By expanding the eikonal and the other relevant quantities up to the fourth power of r, the solution of the pump laser beam is obtained within the extended paraxial ray a

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14

Lizunov, G. V., A. S. Volokitin, and D. B. Skidanov. "The instability of an electron beam with a finite radius in a boundless plasma." Annales Geophysicae 14, no. 4 (1996): 367–74. http://dx.doi.org/10.1007/s00585-996-0367-1.

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Abstract. Within the framework of a linear theory, the instability of an electron beam with a finite radius in a cold magnetised boundless plasma is considered. It is shown that a finite beam dimension influences the generation of quasi-potential waves in two aspects: the perpendicular wave number is quantised so that the frequencies of the waves are subjected to strong selection; a new kind of instability appears due to wave energy losses by emission into surrounding space. Growth rate dependence of wave numbers and frequencies is investigated for typical parameters of experiments with electr

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15

Thejappa, G. "Evidence for the Three Wave Interactions in the Vicinity of an Interplanetary Shock." Astrophysical Journal 937, no. 1 (2022): 28. http://dx.doi.org/10.3847/1538-4357/ac8b07.

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Abstract We present the high time resolution in situ observations of coherent one-dimensional magnetic-field-aligned Langmuir wave packets with well-defined low frequency modulations (beats) in the upstream region of a coronal mass ejection driven supercritical quasi-perpendicular interplanetary (IP) shock. We show that these beat-type waveforms provide what is believed to be the first observational evidence for one of the most important three wave interactions, called the electrostatic decay instability (ESD) L → L ′ + S (L is the pump Langmuir wave excited by the shock accelerated electron b

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16

Krafft, C., and P. Savoini. "Dynamics of Two-dimensional Type III Electron Beams in Randomly Inhomogeneous Solar Wind Plasmas." Astrophysical Journal 949, no. 1 (2023): 24. http://dx.doi.org/10.3847/1538-4357/acc1e4.

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Abstract The dynamics of a type III electron beam generating Langmuir wave turbulence and subsequent electromagnetic emissions is studied owing to two-dimensional Particle-In-Cell simulations performed in both homogeneous and randomly inhomogeneous solar wind plasmas. Important differences in the beam dynamics are highlighted between both cases, due to Langmuir waves’ transformations on the density fluctuations. This paper studies the dynamics of a weak beam interacting with Langmuir wave turbulence scattered by initially applied plasma density fluctuations, in terms of particle acceleration,

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17

Sharma, Prerana, and R. P. Sharma. "Generation of Longmuir turbulence and stochastic acceleration in laser beat wave process." Laser and Particle Beams 28, no. 2 (2010): 285–92. http://dx.doi.org/10.1017/s0263034610000182.

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AbstractThis paper investigates the filamentation process of two co-axially propagating laser beams in collisionless plasma. On account of the ponderomotive nonlinearity, two laser beams affect the dynamics of each other, and cross-focusing takes place. The initial Gaussian laser beams are found to have non-Gaussian structures in the plasma. Using the laser beam and the plasma parameters, appropriate for the beat wave process, the filaments of the laser beams have been studied. Using these results, the Langmuir wave excitation at the beat wave frequency (when the laser beams are having filamen

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18

Baumgärtel, K. "Ion dynamics in electron beam–plasma interaction: particle-in-cell simulations." Annales Geophysicae 32, no. 8 (2014): 1025–33. http://dx.doi.org/10.5194/angeo-32-1025-2014.

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Abstract. Electron beam–plasma interaction including ions is studied by particle-in-cell (PIC) simulations using a one-dimensional, electrostatic code. Evidence for Langmuir wave decay is given for sufficiently energetic beams, as in previous Vlasov–Maxwell simulations. The mechanism for the generation of localized finite-amplitude ion density fluctuations is analyzed. Amplitude modulation due to interference between the beam-generated Langmuir waves causes random wave localization including strong transient spikes in field intensity which create bursty ion density structures via ponderomotive

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19

Nakamura, Y., and K. Ohtani. "Solitary waves in an ion-beam-plasma system." Journal of Plasma Physics 53, no. 2 (1995): 235–43. http://dx.doi.org/10.1017/s0022377800018146.

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Solitary waves in an ion-beam-plasma system are investigated theoretically using the pseudo-potential method, including finite temperatures of plasma ions and beam ions. The beam velocity is high enough to avoid ion-ion instability. Three kinds of solitary waves are possible, corresponding to ion- acoustic waves and to fast and slow space-charge waves in the beam. To observe the formation of solitary waves from an initial positive pulse, numerical simulations are performed. For the slow beam mode, a smaller solitary wave appears at the leading part of the pulse, which is a result of negative n

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20

Vaivads, A., K. Rönnmark, T. Oscarsson, and M. André. "<i>Article:</i> Heating of beam ions by ion acoustic waves." Annales Geophysicae 16, no. 4 (1998): 403–12. http://dx.doi.org/10.1007/s00585-998-0403-4.

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Abstract. Satellite measurements show that ion beams above the auroral acceleration region are heated to hundreds of eV in a direction perpendicular to the magnetic field. We show that ion acoustic waves may be responsible for much of this heating. Even in the absence of a positive slope in the velocity distribution of the beam ions, ion acoustic waves can be generated by a fan instability. We present analytical estimates of the wave growth rate and ion beam heating rate. These estimates, which are confirmed by particle simulations, indicate that the perpendicular temperature of the beam ions

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21

Hill, N. Ross. "Gaussian beam migration." GEOPHYSICS 55, no. 11 (1990): 1416–28. http://dx.doi.org/10.1190/1.1442788.

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Just as synthetic seismic data can be created by expressing the wave field radiating from a seismic source as a set of Gaussian beams, recorded data can be downward continued by expressing the recorded wave field as a set of Gaussian beams emerging at the earth’s surface. In both cases, the Gaussian beam description of the seismic‐wave propagation can be advantageous when there are lateral variations in the seismic velocities. Gaussian‐beam downward continuation enables wave‐equation calculation of seismic propagation, while it retains the interpretive raypath description of this propagation.

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22

LUO, QINGHUAN, and D. B. MELROSE. "Growth of low-frequency waves due to a photon beam in a magnetized electron–positron plasma." Journal of Plasma Physics 58, no. 2 (1997): 345–66. http://dx.doi.org/10.1017/s0022377897005655.

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The effect of a beam of radio waves of very high brightness passing through a cold, magnetized, electron–positron plasma is discussed. The properties of the natural wave modes in such a plasma are summarized, and approximate forms for the nonlinear response tensor are written down. Photon-beam-induced instabilities of low-frequency waves in the pair plasma are analysed in the random-phase approximation. When three-wave interactions involve two high-frequency waves in the same mode and a low-frequency wave in a different mode, wave–wave interactions are similar to wave–particle interactions in

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23

Baqer, Saleh, Dimitrios J. Frantzeskakis, Theodoros P. Horikis, Côme Houdeville, Timothy R. Marchant, and Noel F. Smyth. "Nematic Dispersive Shock Waves from Nonlocal to Local." Applied Sciences 11, no. 11 (2021): 4736. http://dx.doi.org/10.3390/app11114736.

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The structure of optical dispersive shock waves in nematic liquid crystals is investigated as the power of the optical beam is varied, with six regimes identified, which complements previous work pertinent to low power beams only. It is found that the dispersive shock wave structure depends critically on the input beam power. In addition, it is known that nematic dispersive shock waves are resonant and the structure of this resonance is also critically dependent on the beam power. Whitham modulation theory is used to find solutions for the six regimes with the existence intervals for each iden

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Krafft, Catherine, Alexander S. Volokitin, and Gaëtan Gauthier. "Turbulence and Microprocesses in Inhomogeneous Solar Wind Plasmas." Fluids 4, no. 2 (2019): 69. http://dx.doi.org/10.3390/fluids4020069.

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The random density fluctuations observed in the solar wind plasma crucially influence on the Langmuir wave turbulence generated by energetic electron beams ejected during solar bursts. Those are powerful phenomena consisting of a chain of successive processes leading ultimately to strong electromagnetic emissions. The small-scale processes governing the interactions between the waves, the beams and the inhomogeneous plasmas need to be studied to explain such macroscopic phenomena. Moreover, the complexity induced by the plasma irregularities requires to find new approaches and modelling. There

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25

Varma, Ashish, and Asheel Kumar. "Electron Bernstein wave aided heating of collisional nanocluster plasma by nonlinear interactions of two super-Gaussian laser beams." Laser Physics 32, no. 1 (2021): 016001. http://dx.doi.org/10.1088/1555-6611/ac3835.

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Abstract In this present theoretical study, we investigate electron Bernstein wave (EBW) aided collisional nanocluster plasma heating by nonlinear interaction of two super-Gaussian laser beams. The interactions of laser beams electric field profiles with electronic clouds of nanoclusters cause the beat wave. The nonlinear ponderomotive force is generated through the beat wave. There may be good potential to excite the EBW aiding cluster plasma to lead electron heating via cyclotron damping of the Bernstein wave. An analytical scheme is proposed for the anomalous heating and evolution of electr

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26

De Langhe, K., P. Sas, and D. Vandepitte. "The Use of Wave-Absorbing Elements for the Evaluation of Transmission Characteristics of Beam Junctions." Journal of Vibration and Acoustics 119, no. 3 (1997): 293–303. http://dx.doi.org/10.1115/1.2889723.

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The following paper addresses the applicability and the advantages of finite elements for the study of transmission and reflection of waves impinging upon beam junctions. It will be shown that it is possible to simulate travelling waves on general beams by using a wave-absorbing element at each end of the beam. The stiffness matrix of the wave-absorbing element is determined by the characteristic stiffness of the beam. A general procedure to identify the characteristic stiffness is given in the appendix. Next, by performing a direct frequency response analysis on the finite element model of th

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27

Nuwal, Nakul, Deborah A. Levin, and Igor D. Kaganovich. "Excitation of surface waves in 3D ion beam neutralization." Physics of Plasmas 30, no. 4 (2023): 042109. http://dx.doi.org/10.1063/5.0131447.

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Neutralization of beams with 2D and 3D geometries by the electrons emitted from an external source is studied using particle-in-cell simulations. Our work reveals that the high-energy electrons excite Trivelpiece–Gould (TG) surface waves in the beams with 3D axisymmetric geometries. These high-energy electrons are generated because of a large amplitude electrostatic solitary wave (ESW) that forms near the electron source and has an electric potential amplitude more than three times the electron thermal energy. We also find that surface wave excitation only happens when the beam radius is large

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28

Kaufinger, Philip G., John M. Cormack, Kyle S. Spratt, and Mark F. Hamilton. "Predicting second-harmonic generation in shear wave beams in tissue-mimicking phantoms." Journal of the Acoustical Society of America 155, no. 3_Supplement (2024): A330. http://dx.doi.org/10.1121/10.0027702.

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Planar nonlinear shear waves in isotropic media are subject to only cubic nonlinear effects and generate only odd harmonics during propagation. However, wavefront curvature in shear wave beams breaks the symmetry and yields quadratic nonlinear effects, and therefore, a second harmonic may be present in shear wave beams depending on the polarization of the wave. Focused radially polarized shear wave beams have been generated in tissue-mimicking phantoms [Cormack et al., IEEE TBME (2024)], and it is postulated that the second harmonic may be used to estimate the quadratic nonlinearity in such a

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29

Zhu, Xingyu, Jiansen He, Die Duan, et al. "Non-field-aligned Proton Beams and Their Roles in the Growth of Fast Magnetosonic/Whistler Waves: Solar Orbiter Observations." Astrophysical Journal 953, no. 2 (2023): 161. http://dx.doi.org/10.3847/1538-4357/acdc17.

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Abstract The proton beam is an important population of the non-Maxwellian proton velocity distribution in the solar wind, but its role in wave activity remains unclear. In particular, the velocity vector of the proton beam and its influence on wave growth/damping have not been addressed before. Here we explore the origin and the associated particle dynamics of a kinetic wave event in the solar wind by analyzing measurements from Solar Orbiter and comparing them with theoretical predictions from linear Vlasov theory. We identify the waves as outward-propagating circularly polarized fast magneto

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30

James, Litty, Lalita Jassal, and V. K. Tripathi. "Whistler and electron-cyclotron instabilities in a plasma duct." Journal of Plasma Physics 54, no. 1 (1995): 119–28. http://dx.doi.org/10.1017/s0022377800018377.

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A gyrating electron beam propagating through a planar plasma duct can excite a whistler wave or an electron-cyclotron wave, depending on the plasma- density profile of the duct and the energy of the beam. The gyrational motion of the electron beam supplies energy to the wave. In the case of a whistler wave the interaction occurs via coupling of the fast cyclotron beam mode (ω ≈ k2vb + ωc/γ0) to the electromagnetic whistler mode through the Weibel instability mechanism, whereas for an electron-cyclotron wave the coupling is through the negative-mass instability mechanism. It is seen that there

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31

Kamboj, Oriza, Anshul Kumar Teotia, and Niti Kant. "Stimulated Raman scattering by circularly polarized quadruple Gaussian laser beam and co-propagating electron beam in plasma." Laser Physics 33, no. 11 (2023): 115401. http://dx.doi.org/10.1088/1555-6611/acf8b3.

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Abstract This study investigates the interplay between a co-propagating relativistic electron beam and a quadruple Gaussian laser beam in plasma, focusing on the suppression of stimulated Raman scattering (SRS) growth. The presence of the laser beam induces the excitation of a pair of plasma waves and side-scattered electromagnetic waves. As the side-scattered wave and pump wave couple together, they exert a ponderomotive force on the electron beam and plasma electrons, resulting in an enhancement of the plasma wave amplitude. Nonlinear coupling between the density perturbation in the plasma,

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Opsal, Jon, and Allan Rosencwaig. "Physics of Thermal Wave NDE of Semiconductor Materials and Devices." MRS Bulletin 13, no. 4 (1988): 28–33. http://dx.doi.org/10.1557/s0883769400065866.

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Thermal wave physics is playing an ever increasing role in the on-line characterization of semiconductor materials and devices. This is especially true for thermal wave methods that employ laser beams for both the generation and detection of thermal waves. For the modulated reflectance method discussed here, the pump and probe beams are focused on the same spot. They therefore achieve the noncontact advantage of optical methods in addition to the optimum condition for high spatial resolution, a necessary condition for thermal wave measurements on product wafers.When a material is excited with

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33

Yan, Yiton T., C. J. McKinstrie, T. Katsouleas, and J. M. Dawson. "Counterstreaming electron-beam beat-wave accelerator." Physical Review A 36, no. 11 (1987): 5455–58. http://dx.doi.org/10.1103/physreva.36.5455.

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Kulakov, Sergey V., Gennady V. Kulak, and Oleg V. Shakin. "Acousto-optical modulation of airy light beams in crystals." Journal of Physics: Conference Series 2373, no. 6 (2022): 062010. http://dx.doi.org/10.1088/1742-6596/2373/6/062010.

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Abstract The non-collinear diffraction of Airy light beams on ultrasound in the regime of weak and strong acousto-optical (AO) interaction is investigated. Expressions are obtained for the complex amplitudes of diffracted waves in the general case of an anisotropic medium. It is shown that with an increase in the dimensionless parameter of the Airy beam, the efficiency of Bragg diffraction decreases. At the same time, however, the shape of the modulation curve remains unchanged. It is established that the greatest efficiency of anisotropic Bragg diffraction is achieved for a case when the diff

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35

Gul, U., and M. Aydogdu. "Wave Propagation Analysis in Beams Using Shear Deformable Beam Theories Considering Second Spectrum." Journal of Mechanics 34, no. 3 (2017): 279–89. http://dx.doi.org/10.1017/jmech.2017.27.

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AbstractIn this study, wave propagation in beams is studied using different beam theories like Euler-Bernoulli, Timoshenko and Reddy beam theories. Dispersion curves obtained for these beam theories are compared with the exact plane elasticity solutions. It is obtained that, there are two branches for Reddy beam theory similar to the Timoshenko beam theory. However, one branch is obtained for Euler-Bernoulli beam theory. The effects of in-plane load on Timoshenko and Reddy beam theories are examined and dispersion curves of the Timoshenko and Reddy beams are compared with exact plane elasticit

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Zhang, Yang, Liangzhi He, Xu Yan, and Lichen Deng. "Suppression of vortex electromagnetic wave divergence by modulating the wave front dislocation line." Journal of Physics: Conference Series 2809, no. 1 (2024): 012049. http://dx.doi.org/10.1088/1742-6596/2809/1/012049.

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Abstract When the beam is transmitted in the atmosphere, under the influence of atmospheric turbulence, the beam will occur energy attenuation, wavefront distortion and other phenomena, which will seriously affect the transmission and reception of information. Based on the PB phase principle enhances the focusing capability of the auto-focusing Airy Gaussian vortex beam by regulating the wavefront error curvature of the vortex beam, and then enhances the resistance of the beam against atmospheric turbulence. The results reveal the curvature of the wavefront error curve and the peak intensity o

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Lin, R. P. "Electron Beams and Langmuir Turbulence in Solar Type III Radio Bursts Observed in the Interplanetary Medium." Symposium - International Astronomical Union 142 (1990): 467–81. http://dx.doi.org/10.1017/s0074180900088471.

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The ISEE-3 spacecraft has provided in situ observations of electron beams, plasma waves, and associated solar type III radio emission in the interplanetary medium near 1 AU. These observations show that electron beams are formed by the faster electrons arriving before the slower ones, following an impulsive injection at the Sun. The resulting bump-on-tail in the reduced one-dimensional distribution function, f(v||), is unstable to the growth of electrostatic electron plasma (Langmuir) waves. The Langmuir waves are observed to be highly impulsive in nature. The onset and temporal variations of

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KRAFFT, C., A. VOLOKITIN, and M. FLÉ. "Nonlinear dynamics of electron bunches in the presence of dissipative effects." Journal of Plasma Physics 61, no. 2 (1999): 275–93. http://dx.doi.org/10.1017/s0022377898007442.

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The transition phase between two nonlinear regimes of electron-beam–wave interaction depending on the amplitude and the nature of the effective dissipation is investigated with the help of numerical simulations. Effective dissipation due to wave escaping to infinity out of the beam–wave interaction region as well as to collisions in the background plasma is considered. If the dissipation is strong enough, the evolution of the electron beam proceeds in a general way, independently of the type of dissipation and of the nature of the considered waves: structures of strongly concentrated electron

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Jyoti, Suresh C. Sharma, and R. P. Sharma. "Localization and turbulence of beam-driven whistler wave with magnetosonic wave in magnetopause." Physics of Plasmas 30, no. 2 (2023): 022904. http://dx.doi.org/10.1063/5.0134920.

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This study proposes a model to explain how energetic electron beams (produced by the magnetic reconnection process) cause whistler turbulence in the magnetic reconnection area of the magnetopause, as observed by the Magnetospheric Multiscale Mission. In this scenario, the energetic electron beam source has replaced the magnetic reconnection mechanism. We develop dynamic equations of the beam-driven whistler mode so that because of the large amplitude of the beam energy, it rises from the noise level. As a result, nonlinear effects follow due to ponderomotive force, which results in whistler wa

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Deka, Manoj K., Balaram Pradhan, Apul N. Dev, Deepsikha Mahanta, Jalil Manafian, and Khaled H. Mahmoud. "Shock Waves in Ion-Beam-Depleted Spin-Polarized Quantum Plasma with Ionic Pressure Anisotropy." Plasma 8, no. 1 (2025): 3. https://doi.org/10.3390/plasma8010003.

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In this study, the effects of pressure anisotropy and viscosity on the propagation of shock waves in spin-polarized degenerate quantum magnetoplasma are studied under the influence of the streaming energy of ion beams. The effects of different suitable plasma parameters on the shock wave’s potential profile are studied using the steady state solution of the Zakharov–Kuznetsov–Burgers (Z–K–B) equation, as well as the numerical simulation of the governing non-linear Z–K–B equation. First-order analysis of the non-linear wave propagation depicted a new beam-induced stable mode whose Mach number m

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Kwiek, Piotr. "Hong–Ou–Mandel Interference on an Acousto-Optical Beam Splitter." Optics 6, no. 2 (2025): 25. https://doi.org/10.3390/opt6020025.

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This paper presents the results of theoretical and experimental investigations of a Hong–Ou–Mandel interferometer in which an optical beam splitter is replaced by an ultrasonic wave. The ultrasonic wave acts as an acousto-optical beam splitter for light, which is based on the phenomenon of Bragg diffraction on an ultrasonic wave. The Doppler effect was considered in the theoretical considerations and confirmed experimentally. It has been shown theoretically and experimentally that the Doppler effect changes the frequency of two-photon states at the outputs of an acousto-optical beam splitter.

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Chu, Dapeng, Yong Mao, Haoxiang Li, Hong Bie, and Yongjin Zhou. "Dual-Polarized Multi-Beam Fixed-Frequency Beam Scanning Leaky-Wave Antenna." Sensors 23, no. 11 (2023): 5070. http://dx.doi.org/10.3390/s23115070.

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A fixed-frequency beam-scanning leaky-wave antenna (LWA) array with three switchable dual-polarized beams is proposed and experimentally demonstrated. The proposed LWA array consists of three groups of spoof surface plasmon polaritons (SPPs) LWAs with different modulation period lengths and a control circuit. Each group of SPPs LWAs can independently control the beam steering at a fixed frequency by loading varactor diodes. The proposed antenna can be configured in both multi-beam mode and single-beam mode, where the multi-beam mode with optional two or three dual-polarized beams. The beam wid

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Yogesh, Leon Ofman, Scott A. Boardsen, et al. "Evidence of Interaction between Ion-scale Waves and Ion Velocity Distributions in the Solar Wind." Astrophysical Journal 986, no. 2 (2025): 119. https://doi.org/10.3847/1538-4357/add467.

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Abstract Recent in situ observations from Parker Solar Probe (PSP) near perihelia reveal ion beams, temperature anisotropies, and kinetic wave activity. These features are likely linked to solar wind heating and acceleration. During PSP Encounter 17 (at 11.4R s ) on 2023 September 26, the PSP/FIELDS instrument detected enhanced ion-scale wave activity associated with deviations from local thermodynamic equilibrium in ion velocity distribution functions (VDFs) observed by the PSP/Solar Probe Analyzers-Ion. Dense beams (secondary populations) were present in the proton VDFs during this wave acti

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Aftab, H., S. Hussain, S. Mahmood, M. Haseeb, and H. Hasnain. "Neutrino beam driven instability of magnetosonic waves in the presence of oblique magnetic field and ion-neutral collisional effect in plasmas." Physica Scripta 97, no. 1 (2022): 015602. http://dx.doi.org/10.1088/1402-4896/ac4772.

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Abstract The neutrino beam driven instability of fast and slow magnetosonic waves with oblique applied magnetic field in multi-component ion, electron and neutrino beam plasma is studied. The dissipation effects of ion-neutral collisions are also included in the model. The neutrino and electron interactions through electro-weak force are included. It is found that the dissipation of ion collisions has significant effect on the phase velocity of the wave propagation and growth rate of the neutrino beam driven instability. The analytical expression of the growth rate of the fast and slow magneto

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Cao, Shuai, Heow Pueh Lee, and Kian Meng Lim. "Estimation of Wave Reflection Coefficient by Semi-Analytical Method in an Acoustic Black Hole Beam." International Journal of Applied Mechanics 12, no. 01 (2020): 2050004. http://dx.doi.org/10.1142/s1758825120500040.

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Acoustic Black Hole (ABH) has been deployed into beam-plate structures with the passive damping system to enhance its performance in absorbing flexural waves. The wave reflection coefficient can be used to measure this performance. This paper proposes a semi-analytical method to estimate the wave reflection coefficient, which is based on the Finite Element Method (FEM). The proposed method is validated by the exact solution for the wave analysis on the quadratic ABH beam. By this method, this study also investigates the performances of power-law ABH beams with exponent [Formula: see text] and

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Tian, Jun, Ying Li, Jie Hong, and M. D. Ding. "Continuum Enhancement and Line Asymmetries of Solar Flares in Different Heating Models: Alfvén Waves, Nonthermal Electron Beams, and Their Joint Effect." Astrophysical Journal 987, no. 2 (2025): 163. https://doi.org/10.3847/1538-4357/addd0e.

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Abstract How the plasma in the atmosphere is heated during a solar flare remains inconclusive. Nonthermal electron beams are usually considered as an essential heating source, yet Alfvén waves have also been proposed as a promising heating mechanism. Based on radiative hydrodynamic simulations, we explored the performance of different heating mechanisms, including nonthermal electron beams, Alfvén waves, and their joint effects. We studied the parameter space of Alfvén waves, focusing on the heating depth and the continuum emissions at 3600 and 6170 Å. We compared the atmospheric structures, c

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Ishak, S. I., G. R. Liu, S. P. Lim, and H. M. Shang. "Characterization of Delamination in Beams Using Flexural Wave Scattering Analysis." Journal of Vibration and Acoustics 123, no. 4 (2001): 421–27. http://dx.doi.org/10.1115/1.1387023.

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An analytical model for the characterization of delamination in beams using flexural wave scattering analysis is presented. In the beam model of wave propagation, the beam is divided into four regions; to each of them the beam theory of wave propagation is applied to obtain the wave fields excited by a harmonic load on the beam surface. The solution for the entire beam is obtained in terms of the solution for the respective regions using continuity conditions at the junctions. Numerical results on beam displacement for various delamination sizes, materials and excitation frequencies are presen

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Kataoka, T., and T. R. Akylas. "Stability of internal gravity wave beams to three-dimensional modulations." Journal of Fluid Mechanics 736 (November 1, 2013): 67–90. http://dx.doi.org/10.1017/jfm.2013.527.

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AbstractThe linear stability of uniform, plane internal wave beams with locally confined spatial profile, in a stratified fluid of constant buoyancy frequency, is discussed. The associated eigenvalue problem is solved asymptotically, assuming perturbations of long wavelength relative to the beam width. In this limit, instability is found only for oblique disturbances which vary in the along-beam and the horizontal transverse directions. The mechanism of instability is a first-harmonic–mean resonant interaction between the underlying wave beam and three-dimensional perturbations that comprise a

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Shen, Hong Li, Xian Xia Li, Ming Guang Huang, and Jun He. "Automatic Data Acquisition and Analysis System of Electron Beam Distribution Based on LabVIEW Code." Applied Mechanics and Materials 644-650 (September 2014): 2463–66. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.2463.

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Automatic data acquisition and analysis system is set up aiming at measuring and analyzing the electron beams distribution from electron gun and traveling wave tube. It can obtain electron beam parameters, such as three-dimension current density distribution, beam center, beam waist and total current etc. and it can be applied to space technology ranging from centimeter wave to millimeter wave. LabVIEW program is used to acquire data from the hardware equipment and deduce results from post-processing system. As a result, this study is significant to improve the design of electron gun and trave

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SUGIMOTO, N., and K. KUGO. "WAVE PROPAGATION ON AN ELASTIC BEAM TRAVELING IN A TUBE: LINEAR THEORY OF AERODYNAMIC LOADING." Journal of Computational Acoustics 09, no. 03 (2001): 1227–36. http://dx.doi.org/10.1142/s0218396x01001157.

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Linear theory is developed of flexural wave motions of an elastic beam of circular cross-section traveling along its axial direction at a constant speed in an air-filled, circular tube placed coaxially. The beam is constrained to deflect in a plane and is subjected to a restoring force in proportion to the magnitude of deflection. Both beam and tube are assumed to be long enough for end effects to be ignored. Taking account of aerodynamic loading on the lateral surface of the beam, wave propagation is examined under a long-wave approximation that a characteristic wavelength of flexural waves i

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