Spontaneous emission of electromagnetic radiation in turbulent plasmas

Ziebell, L. F.; Yoon, Peter H.; Simões, F.J.R.; Gaelzer, R.; Pavan, J.

doi:10.1063/1.4861619

Cited by 35 publications

(33 citation statements)

References 14 publications

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“…In a recently published paper, 6 the present authors discussed a novel radiation mechanism in unmagnetized plasmas containing a thermal population of electrons only. In the proposed scenario of Ref.…”

Section: Introductionmentioning

confidence: 99%

“…In the proposed scenario of Ref. 6, the EM wave spectrum results from nonlinear interactions involving L and S wave spectra and plasma particles, with the L and S spectra being in equilibrium with the particles.…”

Section: Introductionmentioning

confidence: 99%

“…6 can be described as a turbulent quasi-equilibrium state. Treumann 7,8 first discussed the notion of turbulent equilibrium in plasmas, which involves plasma particles constantly exchanging momentum and energy with enhanced EM fluctuations, but on average the system is in dynamical equilibrium.…”

Section: Introductionmentioning

confidence: 99%

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Transition from thermal to turbulent equilibrium with a resulting electromagnetic spectrum

et al. 2014

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A recent paper [Ziebell et al., Phys. Plasmas 21, 010701 (2014)] discusses a new type of radiation emission process for plasmas in a state of quasi-equilibrium between the particles and enhanced Langmuir turbulence. Such a system may be an example of the so-called “turbulent quasi-equilibrium.” In the present paper, it is shown on the basis of electromagnetic weak turbulence theory that an initial thermal equilibrium state (i.e., only electrostatic fluctuations and Maxwellian particle distributions) transitions toward the turbulent quasi-equilibrium state with enhanced electromagnetic radiation spectrum, thus demonstrating that the turbulent quasi-equilibrium discussed in the above paper correctly describes the weakly turbulent plasma dynamically interacting with electromagnetic fluctuations, while maintaining a dynamical steady-state in the average sense.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Transition from thermal to turbulent equilibrium with a resulting electromagnetic spectrum

et al. 2014

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“…However, in some of the applications that have been made, it was shown that nonlinear effects continue to operate far beyond the time scale of the instability saturation and nonlinear mode coupling, to the extent that an asymptotically steady state, or quasiequilibrium state, of the turbulent system becomes of relevance. Specifically, it was demonstrated that plasma in such a "turbulent equilibrium" state can be associated with a background of electromagnetic radiation [30,32]. It was also shown that the long-range, asymptotic state of the turbulence is associated with the inverse power-law velocity distribution function called the "kappa" distribution [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, numerical analyses were carried out in one or two dimensional systems, such as in Refs. [21][22][23][24][25][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Weak turbulence theory for collisional plasmas

et al. 2016

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Plasma is an ionized gas in which the collective behavior dominates over the individual particle interactions. For this reason, plasma is often treated as collisionless or collision-free. However, the discrete nature of the particles can be important, and often, the description of plasmas is incomplete without properly taking the discrete particle effects into account. The weak turbulence theory is a perturbative nonlinear theory, whose essential formalism was developed in the late 1950s and 1960s and continued on through the early 1980s. However, the standard material found in the literature does not treat the discrete particle effects and the associated fluctuations emitted spontaneously by thermal particles completely. Plasma particles emit electromagnetic fluctuations in all frequencies and wave vectors, but in the standard literature, the fluctuations are approximately treated by considering only those frequency-wave number regimes corresponding to the eigenmodes (or normal modes) satisfying the dispersion relations, while ignoring contributions from noneigenmodes. The present paper shows that the noneigenmode fluctuations modify the particle kinetic equation so that the generalized equation includes the Balescu-Lénard-Landau collision integral and also modify the wave kinetic equation to include not only the collisional damping term but also a term that depicts the bremsstrahlung emission of plasma normal modes.

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Kappa Distribution Function: From Empirical to Physical Concepts

Lazar

Fichtner

2021

Kappa Distributions

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Spontaneous emission of electromagnetic radiation in turbulent plasmas

Cited by 35 publications

References 14 publications

Transition from thermal to turbulent equilibrium with a resulting electromagnetic spectrum

Transition from thermal to turbulent equilibrium with a resulting electromagnetic spectrum

Weak turbulence theory for collisional plasmas

Kappa Distribution Function: From Empirical to Physical Concepts

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