Investigation of plasma density gratings in current carrying plasmas by particle in cell method

Hashemzadeh, M.

doi:10.1088/0741-3335/57/11/115002

Cited by 6 publications

(3 citation statements)

References 41 publications

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“…The structure of PDG is seen in Figure , which indicates that z c 1 parameter is an important parameter for creating this structure. In addition to the interaction between electromagnetic wave and plasma, PDG also exists in the beam–plasma interaction . In order to add the effects of z c 1 and z c 2 parameters on the electron density variation, δn / n 0 as a function of z has been illustrated in Figure .…”

Section: Resultsmentioning

confidence: 99%

Increasing the peaks of non‐linear electron density near critical density in terahertz–plasma interaction

Hashemzadeh

2018

Contributions to Plasma Physics

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Increasing the peaks of non-linear electron density in the interaction between high-power terahertz beams and plasmas with electron density and electron temperature ramps is investigated. Considering the linear inhomogeneities and using the non-linear electron density, a non-linear differential equation governing the wave propagation is derived. Results show that the slope of the temperature and density ramps and their signs affect the amplitude and wavelength of oscillations of electric and magnetic fields. These effects are a result of the ponderomotive non-linearity that changes the distribution of plasma density and leads to the modification of electric and magnetic fields. Furthermore, increase or decrease in the electric field amplitude is because of the energy exchange between electrons and electric field. Profiles of the non-linear electron density indicate that, for positive values of temperature ramp, the amplitude of non-linear electron density decreases, and the wavelength of oscillations increases. However, for negative values of temperature ramp, this behaviour is vice versa. It is also illustrated that, close to critical density, electrons become more steepened. Finally, it is concluded that both positive values of density ramp and negative values of temperature ramp increase the peaks of non-linear electron density, especially near the critical density. KEYWORDS density and temperature inhomogeneities, plasma density gratings, ponderomotive non-linearity 1

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Section: Resultsmentioning

confidence: 99%

Increasing the peaks of non‐linear electron density near critical density in terahertz–plasma interaction

Hashemzadeh

2018

Contributions to Plasma Physics

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“…Hashemzadeh [41][42][43] has carried out particle-in-cell simulation of Buneman instability for q non-extensive distribution and effect of negative ions on the Buneman instability. There is ample amount of other simulation works dealing with Buneman instability in various applications in space and laboratory plasmas that are too numerous to cite.…”

Section: Introductionmentioning

confidence: 99%

Particle-in-cell simulation of Buneman instability beyond quasilinear saturation

Rajawat

Sengupta

2017

Physics of Plasmas

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Spatio-temporal evolution of Buneman instability has been followed numerically till its quasilinear quenching and beyond, using an in-house developed electrostatic 1Dand for a wide range of electron to ion mass ratios (m/M), growth rate obtained from simulation agrees well with the numerical solution of the fourth order dispersion relation. Quasi-linear saturation of Buneman instability occurs when ratio of electrostatic field energy density () reaches up to a constant value, which as predicted by Hirose [Plasma Physics 20, 481(1978)], is independent of initial electron drift velocity but depends on electron to ion mass ratio m/M as. This result stands verified in our simulations. Growth of the instability beyond the first saturation (quasilinear saturation ) till its final saturation [Ishihara et. al., PRL 44, 1404(1980] follows an algebraic scaling with time. In contrast to the quasilinear saturation, the ratio of final saturated electrostatic field energy density to initial kinetic energy density, is relatively independent of electron to ion mass ratio and is found to depend only on the initial drift velocity. Beyond the final saturation, electron phase space holes coupled to large amplitude ion solitary waves, a state known as coupled hole-soliton , are seen in our simulations. The propagation characteristics ( amplitude -speed relation ) of these coherent modes is found to be consistent with

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“…Since the pioneering work of Oscar Buneman [7,8] a lot of work has been done to understand the linear and nonlinear evolution of Buneman instability [9,[24][25][26][27][28][29][30][31][32][33][34][35][36][37] in the nonrelativistic regime [38]. Saturation of Buneman instability in non-relativistic regime has also been studied by numerous authors [9,24,25].…”

Section: Introductionmentioning

confidence: 99%

One dimensional PIC simulation of relativistic Buneman instability

Rajawat

Sengupta

2016

Physics of Plasmas

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Spatio-temporal evolution of the relativistic Buneman instability has been investigated in one dimension using an in-house developed particle-in-cell simulation code. Starting from the excitation of the instability, its evolution has been followed numerically till its quenching and beyond. As compared to the well understood non-relativistic case, it is found that the maximum growth rate (γ max ) reduces due to relativistic effects and varies with γ e0 and m/M as γ max ∼where γ e0 is Lorentz factor associated with the initial electron drift velocity (v 0 ) and (m/M) is the electron to ion mass ratio. Further it is observed that in contrast to the non-relativistic results [Hirose,Plasma Phys. 20, 481(1978)] at the saturation point, ratio of electrostatic field energy density ( k |E k | 2 /8π) to initial drift kinetic energy density (W 0 ) scales with γ e0 as ∼ 1/γ 2 e0 .These simulation results are found to be in good agreement with that derived using fluid theory. * rupendra@ipr.res.in 1 arXiv:1606.03178v1 [physics.plasm-ph]

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Investigation of plasma density gratings in current carrying plasmas by particle in cell method

Cited by 6 publications

References 41 publications

Increasing the peaks of non‐linear electron density near critical density in terahertz–plasma interaction

Increasing the peaks of non‐linear electron density near critical density in terahertz–plasma interaction

Particle-in-cell simulation of Buneman instability beyond quasilinear saturation

One dimensional PIC simulation of relativistic Buneman instability

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