Particle transport and radiation production in sub-Larmor-scale electromagnetic turbulence

Keenan, Brett; Medvedev, Mikhail V.

doi:10.1103/physreve.88.013103

Cited by 8 publications

(44 citation statements)

References 30 publications

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“…Additionally, we anticipated that an interconnection between the transport and radiative properties of electrons moving through small-scale Whistler turbulence exists, as it does for strictly Weibel-like, mean-field-free turbulence (Keenan & Medvedev 2013;Keenan et al 2015).…”

Section: Numerical Resultsmentioning

confidence: 99%

“…In our previous works (Keenan & Medvedev 2013;Keenan et al 2015), we showed that the pitchangle diffusion coefficient and the simultaneously produced radiation spectrum are wholly determined by the particle velocity and the statistical/spectral properties of small-scale (mean free) magnetic turbulence. Here, we have generalized these results to the case when the magnetic field has a mean value.…”

Section: Discussionmentioning

confidence: 99%

“…As for any diffusive process, the mean squared pitch angle grows linearly with time. Thus, the diffusion coefficient appears as Keenan & Medvedev (2013), Keenan et al (2015):…”

Section: Transport Via Magnetic Pitch-angle Diffusionmentioning

confidence: 99%

“…In our previous works, we found the relation between the transport of ultrarelativistic (Keenan & Medvedev 2013) and non-relativistic/trans-relativistic (Keenan, Ford & Medvedev 2015) particles in isotropic three-dimensional small-scale (mean free) magnetic turbulence and the radiation spectra simultaneously produced by these particles. In Keenan & Medvedev (2013), we found that the radiation spectrum, in the ultrarelativistic (small deflection angle) regime, agrees with the small-angle jitter radiation prediction (Medvedev 2000(Medvedev , 2006Reville & Kirk 2010;Medvedev et al 2011;Teraki & Takahara 2011).…”

Section: Introductionmentioning

confidence: 99%

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Diffusion and radiation in magnetized collisionless plasmas with small-scale Whistler turbulence

Keenan¹,

Medvedev²

2016

J. Plasma Phys.

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Magnetized high-energy-density plasmas can often have strong electromagnetic fluctuations whose correlation scale is smaller than the electron Larmor radius. Radiation from the electrons in such plasmas -which markedly differs from both synchrotron and cyclotron radiation -is tightly related to their energy and pitch-angle diffusion. In this paper, we present a comprehensive theoretical and numerical study of particle transport in cold, 'small-scale' Whistler-mode turbulence and its relation to the spectra of radiation simultaneously produced by these particles. We emphasize that this relation is a superb diagnostic tool of laboratory, astrophysical, interplanetary and solar plasmas with a mean magnetic field and strong small-scale turbulence.

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Section: Numerical Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…As for any diffusive process, the mean squared pitch angle grows linearly with time. Thus, the diffusion coefficient appears as Keenan & Medvedev (2013), Keenan et al (2015):…”

Section: Transport Via Magnetic Pitch-angle Diffusionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Diffusion and radiation in magnetized collisionless plasmas with small-scale Whistler turbulence

Keenan¹,

Medvedev²

2016

J. Plasma Phys.

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“…8,[31][32][33][34][35] We will show that the direct observation of mildly relativistic Weibler radiation may be feasible in the laboratory setting. We will focus our attention upon the experiment discussed in Ref.…”

Section: Introductionmentioning

confidence: 99%

Radiation from particles moving in small-scale magnetic fields created in solid-density laser-plasma laboratory experiments

Keenan

Medvedev

2015

Physics of Plasmas

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Plasmas created by high-intensity lasers are often subject to the formation of kineticstreaming instabilities, such as the Weibel instability, which lead to the spontaneous generation of high-amplitude, tangled magnetic fields. These fields typically exist on small spatial scales, i.e. "sub-Larmor scales". Radiation from charged particles moving through small-scale electromagnetic (EM) turbulence has spectral characteristics distinct from both synchrotron and cyclotron radiation, and it carries valuable information on the statistical properties of the EM field structure and evolution. Consequently, this radiation from laserproduced plasmas may offer insight into the underlying electromagnetic turbulence. Here we investigate the prospects for, and demonstrate the feasibility of, such direct radiative diagnostics for mildly relativistic, solid-density laser plasmas produced in lab experiments.

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Overview of laser-driven generation of electron–positron beams

et al. 2015

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Electron-positron (e-p) plasmas are widely thought to be emitted, in the form of ultra-relativistic winds or collimated jets, by some of the most energetic or powerful objects in the Universe, such as black-holes, pulsars, and quasars. These phenomena represent an unmatched astrophysical laboratory to test physics at its limit and, given their immense distance from Earth (some even farther than several billion light years), they also provide a unique window on the very early stages of our Universe. However, due to such gigantic distances, their properties are only inferred from the indirect interpretation of their radiative signatures and from matching numerical models: their generation mechanism and dynamics still pose complicated enigmas to the scientific community. Small-scale reproductions in the laboratory would represent a fundamental step towards a deeper understanding of this exotic state of matter. Here we present recent experimental results concerning the laser-driven production of ultra-relativistic e-p beams. In particular, we focus on the possibility of generating beams that present charge neutrality and that allow for collective effects in their dynamics, necessary ingredients for the testing pair-plasma physics in the laboratory. A brief discussion of the analytical and numerical modelling of the dynamics of these plasmas is also presented in order to provide a summary of the novel plasma physics that can be accessed with these objects. Finally, general considerations on the scalability of laboratory plasmas up to astrophysical scenarios are given.

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Particle transport and radiation production in sub-Larmor-scale electromagnetic turbulence

Cited by 8 publications

References 30 publications

Diffusion and radiation in magnetized collisionless plasmas with small-scale Whistler turbulence

Diffusion and radiation in magnetized collisionless plasmas with small-scale Whistler turbulence

Radiation from particles moving in small-scale magnetic fields created in solid-density laser-plasma laboratory experiments

Overview of laser-driven generation of electron–positron beams

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