Anisotropic heating and magnetic field generation due to Raman scattering in laser-plasma interactions

Silva, T.; Schoeffler, K. M.; Vieira, Jorge; Hoshino, Masahiro; Fonseca, Ricardo; Silva, L. O.

doi:10.1103/physrevresearch.2.023080

Cited by 17 publications

(14 citation statements)

References 47 publications

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“…They may result from an instability due to trapped particles, as shown numerically in Refs. [14][15][16][17]. They may also be due to wavefront bowing, observed numerically in Refs.…”

Section: Introductionmentioning

confidence: 73%

“…As shown in several papers [14][15][16][17], when an EPW grows and enters the strongly nonlinear regime where kinetic effects are important, its spectrum enriches in transverse wavenumbers. Moreover, as discussed in the Introduction, there may be two different reasons for the growth of transverse modes.…”

Section: Transverse Modes Resulting From Wavefront Bowingmentioning

confidence: 96%

“…Moreover, as discussed in the Introduction, there may be two different reasons for the growth of transverse modes. They may result from instabilities, either electrostatic [16] or electromagnetic [15,17], due to trapped particles. They may also be the consequence of the transverse inhomogeneity in the EPW nonlinear frequency shift, δω, which entails the wavefront bowing [14][15][16][17][18][19][20][21][22][23].…”

Section: Transverse Modes Resulting From Wavefront Bowingmentioning

confidence: 99%

“…They may also be due to wavefront bowing, observed numerically in Refs. [14][15][16][17][18][19][20][21][22][23]. Indeed, an SRS-driven EPW grows faster where the laser intensity is larger, near the center of the focal spot.…”

Section: Introductionmentioning

confidence: 99%

“…Then, so are the wave frequency and wave phase velocity, since these are nonlinear functions of the amplitude [2,24]. As a result, the wavefront bends, usually so as to induce self-focussing [14][15][16][17][18][19][20][21][22][23]. This, in turn, entails the growth of transverse modes, since the local wavenumber is essentially perpendicular to the wavefront.…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear adiabatic electron plasma waves. II. Applications

Bénisti,

Minenna,

Tacu

et al. 2022

Preprint

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In this article, we use the general theory derived in the companion paper [M. Tacu and D. Bénisti, Phys. Plasmas (2021)] in order to address several long-standing issues regarding nonlinear electron plasma waves (EPW's). First, we discuss the relevance, and practical usefulness, of stationary solutions to the Vlasov-Poisson system, the so-called Bernstein-Greene-Kruskal modes, to model slowly varying waves. Second, we derive an upper bound for the wave breaking limit of an EPW growing in an initially Maxwellian plasma. Moreover, we show a simple dependence of this limit as a function of kλ D , k being the wavenumber and λ D the Debye length. Third, we explicitly derive the envelope equation ruling the evolution of a slowly growing plasma wave, whatever its amplitude. Fourth, we estimate the growth of the transverse wavenumbers resulting from wavefront bowing by solving the nonlinear, nonstationary, ray tracing equations for the EPW, together with a simple model for stimulated Raman scattering.

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“…They may result from an instability due to trapped particles, as shown numerically in Refs. [14][15][16][17]. They may also be due to wavefront bowing, observed numerically in Refs.…”

Section: Introductionmentioning

confidence: 73%

Section: Transverse Modes Resulting From Wavefront Bowingmentioning

confidence: 96%

Section: Transverse Modes Resulting From Wavefront Bowingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Nonlinear adiabatic electron plasma waves. II. Applications

Bénisti,

Minenna,

Tacu

et al. 2022

Preprint

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Self-organization of photoionized plasmas via kinetic instabilities

Zhang,

Huang,

Joshi

2023

Rev. Mod. Plasma Phys.

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Self-organization in an unmagnetized collisionless plasma (in this paper) refers to formation of transient coherent structures such as collective oscillations (electrostatic waves) or magnetic fields resulting from so-called kinetic effects in the plasma. This topical review provides a comprehensive analysis of the self-organization of strong-field photoionized, non-equilibrium plasmas through kinetic instabilities. The authors propose and demonstrate a novel experimental platform that enables the formation of dense plasmas with known highly anisotropic and non-thermal electron velocity distribution functions on a timescale on the order of an inverse electron plasma frequency. We then show that such plasmas are highly susceptible to a hierarchy of kinetic instabilities, including two-stream, current filamentation and Weibel, that convert a fraction of the electron kinetic energy into electric and/or magnetic energy stored in self-organized structures. The electrostatic waves so produced are measured using a collective light (Thomson) scattering technique with femtosecond resolution as the kinetic instabilities aided by collisions eventually thermalize the plasma electrons. In addition, we describe a novel experimental technique that has made it possible to map the temporal evolution of the wavenumber spectrum of the thermal Weibel instability with picosecond resolution, which leads to the formation of quasi-static coherent magnetic fields with different topologies in photoionized plasmas. Finally, the paper summarizes the important results and discusses future directions on this topic.

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On the analytical description of the nonlinear stage of the Weibel instability in collisionless anisotropic plasma

Nechaev,

Kuznetsov,

Kocharovsky

2023

J. Plasma Phys.

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On the basis of the energy invariants for the Weibel instability in a collisionless non-relativistic plasma, an analytical relation is obtained between the instantaneous values of the space-averaged energy density of the magnetic field, its dominant wavenumber and the average plasma anisotropy parameter. The relation is valid for arbitrary particle velocity distribution functions, including ones that vary with time at the nonlinear stage of instability. It is obtained under the assumption that the plasma is homogeneous along a certain axis, determined, for example, by an external magnetic field, and taking into account only the modes with wavevectors orthogonal to this axis. We give an estimate of the maximum magnetic field energy achievable during the Weibel instability and show that its ratio to the initial longitudinal energy of particles, even for a large initial plasma anisotropy parameter, cannot exceed the value approximately equal to 0.2. The obtained analytical relation is verified using two-dimensional particle-in-cell simulations.

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Anisotropic heating and magnetic field generation due to Raman scattering in laser-plasma interactions

Cited by 17 publications

References 47 publications

Nonlinear adiabatic electron plasma waves. II. Applications

Nonlinear adiabatic electron plasma waves. II. Applications

Self-organization of photoionized plasmas via kinetic instabilities

On the analytical description of the nonlinear stage of the Weibel instability in collisionless anisotropic plasma

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