Ion dynamics in electron beam–plasma interaction: particle-in-cell simulations

Baumgärtel, K.

doi:10.5194/angeo-32-1025-2014

Cited by 10 publications

(16 citation statements)

References 34 publications

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“…4). Further, this is consistent with the PIC simulations of Baumgärtel (2014) who considered the 1D analogue of this system (i.e., the same beam-plasma setup as Run 1 in a 1D PIC code) which afforded superior k x resolution by using box sizes which are inaccessible to our 2D simulations, unambiguously confirming the action of decay/backscattering processes in the system's 1D counterpart.…”

Section: Resultssupporting

confidence: 87%

“…The initial conditions are chosen for two reasons; firstly, their 1D analogues have recently been considered by Baumgärtel (2014), who noted a difference in the nature of the electrostatic decay processes in the two regimes, and so we may explore the consequences for emission processes in our extension to 2D. Secondly, each set-up gives comparable parameters…”

Section: Numerical Setupmentioning

confidence: 99%

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Self-consistent particle-in-cell simulations of fundamental and harmonic plasma radio emission mechanisms

Thurgood

Tsiklauri

2015

A&A

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Aims. The simulation of three-wave interaction based plasma emission, thought to be the underlying mechanism for Type III solar radio bursts, is a challenging task requiring fully-kinetic, multi-dimensional models. This paper aims to resolve a contradiction in past attempts, whereby some studies indicate that no such processes occur. Methods. We self-consistently simulate three-wave based plasma emission through all stages by using 2D, fully kinetic, electromagnetic particle-in-cell simulations of relaxing electron beams using the EPOCH2D code.Results. Here we present the results of two simulations;, which we find to permit and prohibit plasma emission respectively. We show that the possibility of plasma emission is contingent upon the frequency of the initial electrostatic waves generated by the bump-in-tail instability, and that these waves may be prohibited from participating in the necessary three-wave interactions due to frequency conservation requirements. In resolving this apparent contradiction through a comprehensive analysis, in this paper we present the first self-consistent demonstration of fundamental and harmonic plasma emission from a single-beam system via fully kinetic numerical simulation. We caution against simulating astrophysical radio bursts using unrealistically dense beams (a common approach which reduces run time), as the resulting non-Langmuir characteristics of the initial wave modes significantly suppresses emission. Comparison of our results also indicates that, contrary to the suggestions of previous authors, an alternative plasma emission mechanism based on two counter-propagating beams is unnecessary in an astrophysical context. Finally, we also consider the action of the Weibel instability which generates an electromagnetic beam mode. As this provides a stronger contribution to electromagnetic energy than the emission, we stress that evidence of plasma emission in simulations must disentangle the two contributions and not simply interpret changes in total electromagnetic energy as evidence of plasma emission.

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Section: Resultssupporting

confidence: 87%

Section: Numerical Setupmentioning

confidence: 99%

Self-consistent particle-in-cell simulations of fundamental and harmonic plasma radio emission mechanisms

Thurgood

Tsiklauri

2015

A&A

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“…Journal of Geophysical Research: Space Physics velocities in the range of 5 ≤ V b /V e ≤ 50, one gets a frequency shift of 0.01 ≤ δω/ω e ≤ 0.1. That is in good agreement with observations , 2014Gurnett et al, 1993;Hospodarsky et al, 1994;Hospodarsky & Gurnett, 1995;Malaspina et al, 2013;Sigsbee et al, 2010;Soucek et al, 2005). Direct evidence for parametric decay involving two Langmuir waves and one ion acoustic wave has been given by waveform analyses by the S/WAVES instruments onboard the two STEREO spacecraft (Henri et al, 2009).…”

Section: 1029/2018ja025887supporting

confidence: 86%

“…Finally, electrostatic waves in the optical range of kc / ω e ~ 1 are excited. Earlier interpretations of PIC simulation results (Baumgärtel, ; Kasaba et al, ; Matsukiyo et al, ) as well as Vlasov simulations (Silin et al, ; Umeda & Ito, ) are based on Langmuir wave dispersion in a Maxwell plasma, which ignores the modifications due to the beam‐generated plateau. Thus, the generation of low k decay waves without a cascade process could not be explained.…”

Section: Introductionmentioning

confidence: 99%

Parametric Decay of Beam‐Generated Langmuir Waves and Three‐Wave Interaction in Plateau Plasmas: Implications for Type III Radiation

et al. 2019

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Inspired by the results of particle‐in‐cell simulations on beam‐plasma interaction, we present a mechanism for the generation of radio waves in solar type III bursts which provides a closed chain of the conversion processes from beam‐generated Langmuir waves into electromagnetic emission. The mechanism is characterized by two key steps. The first is a hitherto unknown parametric decay process in which the primary wave directly decays to low‐k Langmuir waves (plasma oscillations) and ion acoustic waves. This decay becomes possible due to changes in the dispersion properties of longitudinal waves initiated by the presence of a beam or a plateau in the electron velocity distribution. A resonant three‐wave interaction is established between the beam‐induced Langmuir wave, the plasma oscillations, and the ion acoustic wave. Due to weak damping of the waves involved, this interaction persists after the beam has relaxed to a plateau and lasts as long as the latter exists. In the second step, low‐k Langmuir waves in the range of “optical wavelengths” can linearly couple to obliquely propagating radio waves at the plasma frequency in a wave number region around the cross points where quasi‐longitudinal and quasi‐transverse modes approach each other. Our model does not need the persistence of the beam and the associated instability for radiation to be produced. Although the theory is local with respect to the plasma frequency, it may open a way to overcome Sturrock's () dilemma of rapid beam relaxation on the one side and long‐lived radiation on the other. The observed frequency variation is suggested to arise by “adiabatic” motion of the beam‐created interaction region through the heliospheric plasma of decreasing electron density. Implications for the interpretation of in situ Langmuir waveforms and the diversity of their frequency spectra are discussed.

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“…Nonlinear electrostatic (ES) localized modes (nonlinear waves) occur widely in plasmas [26,27]; the impact of ion beam injection in a plasma has been studied theoretically [28] and also numerically, e.g. via particle-in-cell (PIC) simulations [29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Ion-beam–plasma interaction effects on electrostatic solitary wave propagation in ultradense relativistic quantum plasmas

2017

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Ion-beam-plasma interaction effects on electrostatic solitary wave propagation in ultradense relativistic quantum plasmas Elkamash, I. S., Kourakis, I., & Haas, F. (2017 Publisher rights ©2017 American Physical Society. This work is made available online in accordance with the publisher's policies. Please refer to any applicable terms of use of the publisher. General rightsCopyright for the publications made accessible via the Queen's University Belfast Research Portal is retained by the author(s) and / or other copyright owners and it is a condition of accessing these publications that users recognise and abide by the legal requirements associated with these rights. Understanding the transport properties of charged particle beams is not only important from a fundamental point of view, but also due to its relevance in a variety of applications. A theoretical model is established in this article, to model the interaction of a tenuous positively charged ion beam with an ultradense quantum electron-ion plasma, by employing a rigorous relativistic quantumhydrodynamic (fluid plasma) electrostatic model proposed in [M. McKerr et al, Phys. Rev. E, 90, 033112 (2014)]. A nonlinear analysis is carried out to elucidate the propagation characteristics and the existence conditions of large amplitude electrostatic solitary waves propagating in the plasma in the presence of the beam. Anticipating stationary profile excitations, a pseudo-mechanical energy balance formalism is adopted to reduce the fluid evolution equation to an ordinary differential equation. Exact solutions are thus obtained numerically, predicting localized excitations (pulses) for all of the plasma state variables, in response to an electrostatic potential disturbance. An ambipolar electric field form is also obtained. Thorough analysis of the reality conditions for all variables is undertaken, in order to determine the range of allowed values for the solitonic pulse speed and how it varies as a function of the beam characteristics (beam velocity, density).

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Ion dynamics in electron beam–plasma interaction: particle-in-cell simulations

Cited by 10 publications

References 34 publications

Self-consistent particle-in-cell simulations of fundamental and harmonic plasma radio emission mechanisms

Self-consistent particle-in-cell simulations of fundamental and harmonic plasma radio emission mechanisms

Parametric Decay of Beam‐Generated Langmuir Waves and Three‐Wave Interaction in Plateau Plasmas: Implications for Type III Radiation

Ion-beam–plasma interaction effects on electrostatic solitary wave propagation in ultradense relativistic quantum plasmas

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