Growth and propagation of self-generated magnetic dipole vortices in collisionless shocks produced by interpenetrating plasmas

Naseri, Neda; Bochkarev, S. G.; Ruan, P.; Bychenkov, V. Yu.; Khudik, Vladimir; Shvets, Gennady

doi:10.1063/1.5008278

Cited by 25 publications

(24 citation statements)

References 42 publications

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“…Electron vortex pairs are also observed in simulations of relativistic shocks, being responsible for electron energization in the upstream region (Naseri et al. 2018). Understanding the dynamics of vortex structures in plasmas is important for developing the theory of relativistic plasma turbulence (Bulanov et al.…”

Section: Introductionmentioning

confidence: 93%

On annihilation of the relativistic electron vortex pair in collisionless plasmas

et al. 2018

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In contrast to hydrodynamic vortices, vortices in a plasma contain an electric current circulating around the centre of the vortex, which generates a magnetic field localized inside. Using computer simulations, we demonstrate that the magnetic field associated with the vortex gives rise to a mechanism of dissipation of the vortex pair in a collisionless plasma, leading to fast annihilation of the magnetic field with its energy transforming into the energy of fast electrons, secondary vortices and plasma waves. Two major contributors to the energy damping of a double vortex system, namely, magnetic field annihilation and secondary vortex formation, are regulated by the size of the vortex with respect to the electron skin depth, which scales with the electron$\unicode[STIX]{x1D6FE}$factor,$\unicode[STIX]{x1D6FE}_{e}$, as$R/d_{e}\propto \unicode[STIX]{x1D6FE}_{e}^{1/2}$. Magnetic field annihilation appears to be dominant in mildly relativistic vortices, while for the ultrarelativistic case, secondary vortex formation is the main channel for damping of the initial double vortex system.

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Section: Introductionmentioning

confidence: 93%

On annihilation of the relativistic electron vortex pair in collisionless plasmas

et al. 2018

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“…We studied the process of electron energization in interaction with MVs in the upstream of electron/ion shock using 2D PIC simulations. MVs are self-consistently generated in upstream of electron/ion collisionless shock 15 . The fields of MVs grow as they move toward shock region.…”

Section: Discussionmentioning

confidence: 99%

“…Counter stream electron flow are electrons that are either reflected off shock transition region, or escaped interaction with shock transition region. Recently we demonstrated that magnetic vortices (MVs) can self-consistently emerge in the upstream of electron/ion collisionless shocks with no external magnetic field 15 . The early stage of the interaction involves the generation of quasi-linear elongated MVs, which subsequently merge to form circularly shaped MVs (bubble).…”

Section: Introductionmentioning

confidence: 99%

“…Localized regions of the strong magnetic field in the form of magnetic dipole vortices (MVs) upstream of the shock were observed in the simulations developed during the nonlinear evolution of the electron and ion filaments. The magnetic vortex generation occurs at the stage where flow energy transformation into thermal energy takes place 15 . The MV's magnetic (and electric) fields grow and their longitudinal size shrink as they move towards shock front after formation.…”

Section: Introductionmentioning

confidence: 99%

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Electron Energization Dynamics in Interaction of Self-Generated Magnetic Vortices in Upstream of Collisionless Electron/Ion Shocks

Naseri

Bochkarev

Bychenkov

et al. 2021

Preprint

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Relativistic collisionless shocks are considered responsible for particle energization mechanisms leading to particle acceleration. While electron energization in shock front region of electron/ion collisionless shocks are the most commonly studied, the mechanism of electron energization in interaction with self-generated magnetic vortices (MVs) in upstream region is still unclear. We investigate electron energization mechanism in upstream region of electron/ion relativistic collisionless shocks, using two dimensional particle-in-cell (PIC) simulations. We discuss mechanism of electron energization which takes place in upstream region of the shock, where the counter stream particles interact with incoming flow. The energy gain of electrons happens during their interaction with evolving fields of self-generated magnetic vortices in this region. Three Fermi-like electron energization scenarios are discussed. Stochastic acceleration of electrons in interaction with fields of MV leads to anisotropic heating of fast electrons due to diffusion in the momentum space of electrons and, finally, synergetic effect of evolving fields of MVs leads to the formation of a power-law tail of supra-thermal particles.

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“…The generation of magnetic field based on ultra intense laser-plasma interactions has been investigated intensively in recent years [104][105][106] . Furthermore, the interactions of beam-plasma are also discussed for strong magnetic dipoles generation [107,108] . The magnetic field generation under the condition of ultra-intense laser interacting with underdense or near critical density plasma is discussed in this section.…”

Section: Static Magnetic Field Driven By Energetic Electron Beammentioning

confidence: 99%

Magnetic field annihilation and charged particle acceleration in ultra-relativistic laser plasmas

Bulanov

2021

High Pow Laser Sci Eng

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Magnetic reconnection driven by laser plasma interactions attracts great interests in the recent decades. Motivated by the rapid development of the laser technology, the ultra strong magnetic field generated by the laser-plasma accelerated electrons provides unique environment to investigate the relativistic magnetic field annihilation and reconnection. It opens a new way for understanding relativistic regimes of fast magnetic field dissipation particularly in space plasmas, where the large scale magnetic field energy is converted to the energy of the nonthermal charged particles. Here we review the recent results in relativistic magnetic reconnection based on the laser and collisionless plasma interactions. The basic mechanism and the theoretical model are discussed. Several proposed experimental setups for relativistic reconnection research are presented.

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Growth and propagation of self-generated magnetic dipole vortices in collisionless shocks produced by interpenetrating plasmas

Cited by 25 publications

References 42 publications

On annihilation of the relativistic electron vortex pair in collisionless plasmas

On annihilation of the relativistic electron vortex pair in collisionless plasmas

Electron Energization Dynamics in Interaction of Self-Generated Magnetic Vortices in Upstream of Collisionless Electron/Ion Shocks

Magnetic field annihilation and charged particle acceleration in ultra-relativistic laser plasmas

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