A linear model for amplitude modulation of Langmuir waves in weak electron-beam plasma interaction

Baumgärtel, K.

doi:10.5194/angeo-31-31-2013

Cited by 7 publications

(5 citation statements)

References 19 publications

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“…e Ey amplitude increases 30 times during 40 < ω pe t < 85. According to Figure 2, the wavelength of quasilinear perturbations along the y-direction at ω pe t∼40 is λ/λ D ∼150 which is in good agreement with that predicted by theory [11] as λ/λ D ∼2π V d,b /V th,e ∼2π × 6 × 10 7 /2.65 × 10 6 � 142.…”

Section: Resultssupporting

confidence: 84%

“…Yi et al [10] presented a comparative study of the dynamics of the electron beam-plasma system in two spatial dimensions by means of particle-in-cell (PIC) simulation and quasilinear theory, and it is found that the quasilinear theory quite adequately accounts for most important features associated with the simulation result. In another theoretical study, Baumgartel [11] described a simple linear approach to the phenomenon of amplitude modulation of Langmuir waves in weak beam-plasma interaction and found out that the resulting waveforms in temporal representation are quite similar to those observed by the spacecraft. Gurnett et al [12] presented observations of the parametric decay and spatial collapse of Langmuir waves driven by an electron beam streaming into the solar wind from the Jovian bow shock.…”

Section: Introductionmentioning

confidence: 82%

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The Effect of Ion-to-Electron Mass Ratio on the Electron Beam-Plasma Interaction

et al. 2021

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Two-dimensional electromagnetic particle-in-cell simulations are carried out to investigate the effect of ion-to-electron mass ratio on the evolution of warm electron beam-plasma instability. Four cases are considered: A: mi/me = 0 (two-electron stream instability); B: mi/me = 1 (pair plasma); C: mi/me = 100; and D: mi/me = 1000. It is shown that the generation of Langmuir waves in the fundamental mode of electron plasma frequency and the subsequent dynamics of large-amplitude solitons are not affected by the ion species. However, it determines the decay process of solitons and the excitation of electromagnetic waves in the second harmonic. In the first two cases, mi/me = 0 and 1, there is no sign of emission in the second harmonic, while the strongest emission in the second harmonic is found for the case of largest mass ratio, mi/me = 1000. This confirms the two-step wave-wave coupling mechanism for the generation of second harmonic electromagnetic waves, which requires the excitation of ion-acoustic waves in the first step. Moreover, the dispersion diagrams of all excited waves are presented.

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Section: Resultssupporting

confidence: 84%

Section: Introductionmentioning

confidence: 82%

The Effect of Ion-to-Electron Mass Ratio on the Electron Beam-Plasma Interaction

et al. 2021

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“…In a previous paper (Baumgärtel, 2013, hereafter referred to as B1), a simple linear model of the gentle beam-plasma instability has been developed that turned out to be capable of explaining primary characteristics of the irregular type of the modulation. The model, however, fails in describing coherent modulation.…”

Section: Introductionmentioning

confidence: 99%

Coherent amplitude modulation of electron-beam-driven Langmuir waves

Baumgärtel

2013

Ann. Geophys.

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Abstract. A linear approach to the phenomenon of irregular amplitude modulation of beam-driven Langmuir waves, developed in a previous paper, is extended to explain periodic modulation as well. It comes about by beating of the fastest growing mode of the instability with beam-aligned plasma oscillations. They are naturally generated in a uniform domain of beam–plasma interaction prior to the onset of the instability. Particle-in-cell (PIC) simulations support the results of the linear analysis.

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“…In the case of 2α = 90 • (see figure 6(c)), the amplitude modulation of E x becomes disordered, and the periodicity of B z envelope becomes weaker. When 2α = 30 • (see figure 6 According to the [40] and [41], the amplitude modulation of E x can be a result from beating of plasma waves with different frequencies. In particular, if there exists an obvious double peak in the spectrum, which means two different wave modes close with each other, then the beating will be coherent and the amplitude modulation will be periodic.…”

Section: Discussion On Performance Of the Radiation Sourcementioning

confidence: 99%

Novel mechanism for terahertz radiation by oblique colliding of two electron beams in plasma

Yang¹,

Tang²,

Wang³

et al. 2021

J. Phys. D: Appl. Phys.

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A new scheme for generating high power terahertz (THz) radiation by using two obliquely colliding electron beams in plasma is proposed. The particle-in-cell (PIC) simulation finds that a small beam intersection of high electron density is formed within a plasma wavelength when two thin electron beams collide. Meanwhile, the beam intersection can oscillate in a strong plasma wave driven by the two beams to produce THz radiation at double plasma frequency. A theoretical model is established showing that the radiation mechanism is the second-order current generated by the beam intersection oscillation. The angular distribution of the THz radiation is calculated by the theory, which agrees well with the PIC simulation. Compared with the existing high power THz sources, the scheme provided in this article has the advantages of a simple structure and no need for extreme parameter conditions, which is hopeful for applications in kilowatt-level coherent compact THz sources.

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A linear model for amplitude modulation of Langmuir waves in weak electron-beam plasma interaction

Cited by 7 publications

References 19 publications

The Effect of Ion-to-Electron Mass Ratio on the Electron Beam-Plasma Interaction

The Effect of Ion-to-Electron Mass Ratio on the Electron Beam-Plasma Interaction

Coherent amplitude modulation of electron-beam-driven Langmuir waves

Novel mechanism for terahertz radiation by oblique colliding of two electron beams in plasma

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