Onset and saturation of backward stimulated Raman scattering of laser in trapping regime in three spatial dimensions

Yin, L.; Albright, B. J.; Rose, H. A.; Bowers, K. J.; Bergen, B.; Montgomery, D. S.; Kline, J. L.; Fernández, Juan

doi:10.1063/1.3250928

Cited by 57 publications

(68 citation statements)

References 36 publications

(55 reference statements)

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“…In actual plasma, the SRS daughter LW is subject to other instabilities as well, such as LW-ion-acoustic decay (LDI). Fluid and kinetic regime LDI have been observed in SRS simulations [19,22] while kinetic regime LDI has been experimentally [23] noted [12].…”

Section: Introductionmentioning

confidence: 99%

“…If a timedependent Vlasov equation solution has a symmetry, e.g., in 2 + 2D (two space and two velocity dimensions) when the initial condition (and possible external potential) only depend on one spatial coordinate z, or in 3 + 3D a cylindrically symmetric configuration, then an instability may break that symmetry, allowing for a determination of growth rate. The former, revisited here, was explored in 2 + 2D Vlasov simulations [17], while the latter was observed [19] in 3D PIC, SRS single speckle simulations. In addition, we present LW filamentation growth rates of linear fluctuations about a particular class of BGK modes, recalled in the next Section III A.…”

Section: Bgk Mode Linear Filamentation Instabilitymentioning

confidence: 99%

“…(15) and (17) directly in s variable which has more compact form compared to Eqs. (18)- (19). However, we chose to use Eqs.…”

Section: A Construction Of 1+1d Bgkmentioning

confidence: 99%

“…Negative ∆ω trapped , with positive diffraction, imply LW filamentation [8,[15][16][17]. 3D particle-in-cell (PIC) [18] simulation results have been interpreted as showing that the trapped electron LW filamentation instability can saturate [19,20] stimulated Raman backscatter (SRS) [21] by reducing the LWs coherence. In actual plasma, the SRS daughter LW is subject to other instabilities as well, such as LW-ion-acoustic decay (LDI).…”

Section: Introductionmentioning

confidence: 99%

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Langmuir wave filamentation in the kinetic regime. I. Filamentation instability of Bernstein-Greene-Kruskal modes in multidimensional Vlasov simulations

2017

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A nonlinear Langmuir wave in the kinetic regime kλD 0.2 may have a filamentation instability, where k is the wavenumber and λD is the Debye length. The nonlinear stage of that instability develops into the filamentation of Langmuir waves which in turn leads to the saturation of the stimulated Raman scattering in laser-plasma interaction experiments. Here we study the linear stage of the filamentation instability of the particular family [1] of Bernstein-Greene-Kruskal (BGK) modes [2] that is a bifurcation of the linear Langmuir wave. Performing direct 2+2D Vlasov-Poisson simulations of collisionless plasma we find the growth rates of oblique modes of the electric field as a function of BGK's amplitude, wavenumber and the angle of the oblique mode's wavevector relative to the BGK's wavevector. Simulation results are compared to theoretical predictions.

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Section: Introductionmentioning

confidence: 99%

Section: Bgk Mode Linear Filamentation Instabilitymentioning

confidence: 99%

“…(15) and (17) directly in s variable which has more compact form compared to Eqs. (18)- (19). However, we chose to use Eqs.…”

Section: A Construction Of 1+1d Bgkmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Langmuir wave filamentation in the kinetic regime. I. Filamentation instability of Bernstein-Greene-Kruskal modes in multidimensional Vlasov simulations

2017

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“…State-of-the-art PIC codes move up to 10 11 macroparticles during ϳ10 5 time steps. 94 As sketched in Fig. 3, the PIC technique consists in representing the plasma as a collection of N macroparticles subjected to self-consistent electromagnetic fields.…”

Section: Principle Of Particle-in-cell Simulationsmentioning

confidence: 99%

Multidimensional electron beam-plasma instabilities in the relativistic regime

2010

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The interest in relativistic beam-plasma instabilities has been greatly rejuvenated over the past two decades by novel concepts in laboratory and space plasmas. Recent advances in this long-standing field are here reviewed from both theoretical and numerical points of view. The primary focus is on the two-dimensional spectrum of unstable electromagnetic waves growing within relativistic, unmagnetized, and uniform electron beam-plasma systems. Although the goal is to provide a unified picture of all instability classes at play, emphasis is put on the potentially dominant waves propagating obliquely to the beam direction, which have received little attention over the years. First, the basic derivation of the general dielectric function of a kinetic relativistic plasma is recalled. Next, an overview of two-dimensional unstable spectra associated with various beam-plasma distribution functions is given. Both cold-fluid and kinetic linear theory results are reported, the latter being based on waterbag and Maxwell-Jüttner model distributions. The main properties of the competing modes ͑developing parallel, transverse, and oblique to the beam͒ are given, and their respective region of dominance in the system parameter space is explained. Later sections address particle-in-cell numerical simulations and the nonlinear evolution of multidimensional beam-plasma systems. The elementary structures generated by the various instability classes are first discussed in the case of reduced-geometry systems. Validation of linear theory is then illustrated in detail for large-scale systems, as is the multistaged character of the nonlinear phase. Finally, a collection of closely related beam-plasma problems involving additional physical effects is presented, and worthwhile directions of future research are outlined.

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Simulated Raman scattering instability of laser beam in a plasma channel

Ghanshyam¹

2012

Indian J Phys

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Onset and saturation of backward stimulated Raman scattering of laser in trapping regime in three spatial dimensions

Cited by 57 publications

References 36 publications

Langmuir wave filamentation in the kinetic regime. I. Filamentation instability of Bernstein-Greene-Kruskal modes in multidimensional Vlasov simulations

Langmuir wave filamentation in the kinetic regime. I. Filamentation instability of Bernstein-Greene-Kruskal modes in multidimensional Vlasov simulations

Multidimensional electron beam-plasma instabilities in the relativistic regime

Simulated Raman scattering instability of laser beam in a plasma channel

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