Electromagnetic-Wave Excitation in a Large Laboratory Beam-Plasma System

Whelan, D. A.; Stenzel, R. L.

doi:10.1103/physrevlett.47.95

Cited by 74 publications

(21 citation statements)

References 12 publications

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“…Related processes in laboratory plasmas have also been discussed by, e.g. Hutchinson et al (1978), Benford et al (1980), Whelan & Stenzel (1981), Intrator et al (1984), Whelan & Stenzel (1985). Furthermore, radio bursts of millisecond duration were recently discovered in the 1 GHz band Loeb et al (2014), with strong evidence that they come from ∼1 Gpc distances, implying extraordinarily high-brightness temperature.…”

Section: Introductionmentioning

confidence: 98%

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: Introductionmentioning

confidence: 98%

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

Thurgood

Tsiklauri

2015

A&A

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“…16,17 In the context of electron beam-plasma experiments, radio emission has been observed, and different interpretations involving mode conversion, and/or strong/weak turbulence have been advanced. [18][19][20][21] For most type III bursts, analytical work has shown that plasma emission is the dominant mechanism. 22,23 Plasma emission is also responsible for other solar and interplanetary radio emissions; e.g., type II solar radio bursts and 2 -3 kHz radio emission in the outer heliosphere.…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling of type III solar radio bursts in the inhomogeneous solar corona and interplanetary medium

Robinson

Cairns

2006

Physics of Plasmas

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The first numerical calculations are presented for type III solar radio bursts in the inhomogeneous solar corona and interplanetary medium that include microscale quasilinear and nonlinear processes, intermediate-scale driven ambient density fluctuations, and large-scale evolution of electron beams, Langmuir and ion-sound waves, and fundamental and harmonic electromagnetic emission. Bidirectional coronal radiation driven by oppositely directed beams is asymmetric between the upward and downward directions due to downward beam narrowing in velocity space, and harmonic emission dominates fundamental emission, consistent with observations and theoretical analysis. In the interplanetary medium, fundamental and/or harmonic emission can be important depending on beam parameters and plasma conditions. Furthermore, Langmuir waves are bursty, ion-sound waves also show some degree of irregularity, while electromagnetic radiations are relatively smooth, all qualitatively consistent with observations. Moreover, the statistics of Langmuir wave energy agree well with the predictions of stochastic growth theory, indicating that the beam-Langmuir wave system evolves to a stochastic growth state.

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“…Classic examples are the solar type II and III radio bursts (Goldman 1983;Melrose 1985;Robinson & Cairns 1998a, 1998b, 1998c. Laboratory beam-plasma interaction experiments also demonstrate plasma emission or equivalent phenomenon (Hutchinson et al 1978;Benford et al 1980;Whelan & Stenzel 1985a, 1985bIntrator et al 1984). One of the most commonly accepted mechanisms for the 2H EM emission involves the merging of two oppositely traveling Langmuir waves, compactly expressed as L+L → 2H, where L stands for the primary Langmuir wave traveling along the electron beam, while L represents the backscattered Langmuir wave traveling opposite to L. Here, 2H stands for the 2H EM wave.…”

Section: Introductionmentioning

confidence: 99%

Multiple harmonic plasma emission

Yoon

Ryu

2007

Physics of Plasmas

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Electromagnetic radiation at the plasma frequency and/or its second harmonic, the so-called plasma emission, is widely accepted as the fundamental process responsible for solar type II and III radio bursts. There have also been occasional observations of higher-harmonic plasma emissions in the solar-terrestrial environment. This paper presents the first demonstration of multiple harmonic emission by means of twodimensional electromagnetic particle-in-cell simulation. This finding indicates that under certain circumstances the traditional mechanism of fundamental-harmonic pair emission might also be accompanied by higher-harmonic components. Consequently, the present findings are highly relevant to in situ observations of third-and/or higher-harmonic plasma emission in astrophysical and solar-terrestrial environments.

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Electromagnetic-Wave Excitation in a Large Laboratory Beam-Plasma System

Cited by 74 publications

References 12 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

Numerical modeling of type III solar radio bursts in the inhomogeneous solar corona and interplanetary medium

Multiple harmonic plasma emission

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