Electron bunches in nonlinear collective beam-plasma interaction

Kovalenko, V.P.

doi:10.3367/ufnr.0139.198302b.0223

Cited by 16 publications

(3 citation statements)

References 6 publications

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“…These solitary waves are Debye-scale structures with positive electrostatic potentials and exist due to a dearth of the phase space density of electrons trapped by the bipolar parallel electric field (Dupree, 1982;Gurevich, 1968;Krasovsky et al, 1997;Schamel, 1986Schamel, , 2000. Electrostatic solitary waves interpreted in terms of electron phase space holes were observed in laboratory experiments (Fox et al, 2008;Kovalenko, 1983;Lefebvre et al, 2010;Saeki et al, 1979) and widely reported in various regions/transient structures in the near-Earth space including the plasma sheet boundary layer (Matsumoto et al, 1994;, auroral region (Ergun et al, 1998;Franz et al, 2005;Mozer et al, 1997), inner magnetosphere (Malaspina et al, 2014(Malaspina et al, , 2018Mozer et al, 2015;Vasko et al, 2015;Vasko, Agapitov, Mozer, Artemyev, Drake, et al, 2017), reconnection current sheets (Cattell et al, 2002(Cattell et al, , 2005Graham et al, 2016), fast plasma flows (Deng et al, 2010;Ergun et al, 2015;Viberg et al, 2013), magnetic flux ropes (Khotyaintsev et al, 2010;Øieroset et al, 2014), and other regions of the near-Earth space (e.g., Cattell et al, 2003;Malaspina & Hutchinson, 2019;Mangeney et al, 1999;Pickett et al, 2008). In all these regions electron phase space holes substantially contribute to the power spectral density of broadband electrostatic fluctuations reported already aboard early spacecraft missions (Gurnett et al, 1976;Lakhina et al, 2000;Scarf et al, 1974).…”

Section: Introductionmentioning

confidence: 99%

Multisatellite MMS Analysis of Electron Holes in the Earth's Magnetotail: Origin, Properties, Velocity Gap, and Transverse Instability

et al. 2020

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We present a statistical analysis of more than 2,400 electrostatic solitary waves interpreted as electron holes (EH) measured aboard at least three Magnetospheric Multiscale (MMS) spacecraft in the Earth's magnetotail. The velocities of EHs are estimated using the multispacecraft interferometry. The EH velocities in the plasma rest frame are in the range from just a few km/s, which is much smaller than ion thermal velocity V Ti , up to 20,000 km/s, which is comparable to electron thermal velocity V Te. We argue that fast EHs with velocities larger than about 0.1V Te are produced by bump-on-tail instabilities, while slow EHs with velocities below about 0.05V Te can be produced by warm bistream and, probably, Buneman-type instabilities. We show that typically fast and slow EHs do not coexist, indicating that the instabilities producing EHs of different types operate independently. We have identified a gap in the distribution of EH velocities between V Ti and 2V Ti , which is considered to be the evidence for self-acceleration (Zhou & Hutchinson, 2018) or ion Landau damping of EHs. Parallel spatial scales and amplitudes of EHs are typically between λ D and 10 λ D and between 10 −3 T e and 0.1 T e , respectively. We show that electrostatic potential amplitudes of EHs are below the threshold of the transverse instability and highly likely restricted by the nonlinear saturation criterion of electron streaming instabilities seeding electron hole formation: eΦ 0 ≲m e ϖ 2 d 2 jj , where ϖ ¼ min(γ, 1.5 ω ce), where γ is the increment of instabilities seeding EH formation, while ω ce is electron cyclotron frequency. The implications of the presented results are discussed.

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Section: Introductionmentioning

confidence: 99%

Multisatellite MMS Analysis of Electron Holes in the Earth's Magnetotail: Origin, Properties, Velocity Gap, and Transverse Instability

et al. 2020

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“…ANISIMOV, M.A. SHCHERBININ, 2016 inhomogeneous plasma diagnostics through the analysis of the transition radiation emitted by charged particles and bunches [15], as well as owing to their capability to focus electron bunches [16].…”

Section: Introductionmentioning

confidence: 99%

Dynamics of Short Electron Bunches and Wakefields Excited by Them in Plasma with and without a Longitudinal Magnetic Field

Anisimov

Shcherbinin

2016

Ukr. J. Phys.

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Using the computer simulation, the influence of a longitudinal magnetic field on the wakefield excitation in plasma by an initially cylindrical electron bunch with the length equal to the wake wavelength and the inverse influence of excited fields on the bunch dynamics have been considered. It is shown that the magnetic field can suppress the radial defocusing of the bunch and increase the length of the region, in which the wake waves are excited, as well as the amplitude of those waves. K e y w o r d s: plasma, electron bunch, longitudinal magnetic field, wakefield, radial defocusing of a bunch.

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“…O'Neil et al, 1971;Shevchenko, 1968, 1971;Matsiborko et al, 1972Matsiborko et al, , 1973Kovalenko, 1983;Pivovarov et al, 1995;Volokitin and Krafft, 2000, 2001a, 2001b, 2004Krafft et al, 2000;Volokitin, 2002, 2003a): first, the study of the instability and the saturation processes of a single monochromatic wave (which can be used for the modeling of some experimental situations in laboratory), and second, the evolution of a wide spectrum of waves at the stage when the turbulence is well developed. However, the intermediate case, when only a few wave modes are governing the nonlinear processes through their mutual interaction and their interaction with the particles, has also to be considered for the adequate modeling of some space plasma phenomena.…”

Section: Introductionmentioning

confidence: 99%

Resonant three-wave interaction in the presence of suprathermal electron fluxes

Krafft

Volokitin

2004

Ann. Geophys.

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Abstract.A theoretical and numerical model is presented which describes the nonlinear interaction of lower hybrid waves with a non-equilibrium electron distribution function in a magnetized plasma. The paper presents some relevant examples of numerical simulations which show the nonlinear evolution of a set of three waves interacting at various resonance velocities with a flux of electrons presenting some anisotropy in the parallel velocity distribution (suprathermal tail); in particular, the case when the interactions between the waves are neglected (for sufficiently small waves' amplitudes) is compared to the case when the three waves follow a resonant decay process. A competition between excitation (due to the fan instability with tail electrons or to the bump-in-tail instability at the Landau resonances) and damping processes (involving bulk electrons at the Landau resonances) takes place for each wave, depending on the strength of the wave-wave coupling, on the linear growth rates of the waves and on the modifications of the particles' distribution resulting from the linear and nonlinear wave-particle interactions. It is shown that the energy carried by the suprathermal electron tail is more effectively transfered to lower energy electrons in the presence of wave-wave interactions.

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Electron bunches in nonlinear collective beam-plasma interaction

Cited by 16 publications

References 6 publications

Multisatellite MMS Analysis of Electron Holes in the Earth's Magnetotail: Origin, Properties, Velocity Gap, and Transverse Instability

Multisatellite MMS Analysis of Electron Holes in the Earth's Magnetotail: Origin, Properties, Velocity Gap, and Transverse Instability

Dynamics of Short Electron Bunches and Wakefields Excited by Them in Plasma with and without a Longitudinal Magnetic Field

Resonant three-wave interaction in the presence of suprathermal electron fluxes

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