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Dec 2009

Volume 16, Issue 12, Articles (12xxxx)

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Phys. Plasmas 16, 120701 (2009); http://dx.doi.org/10.1063/1.3271410 (4 pages)

Z. Vörös, M. P. Leubner, A. Runov, V. Angelopoulos, and W. Baumjohann
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Comment on “On higher order corrections to gyrokinetic Vlasov–Poisson equations in the long wavelength limit” [ Phys. Plasmas 16, 044506 (2009) ]

Felix I. Parra and Peter J. Catto

Phys. Plasmas 16, 124701 (2009); http://dx.doi.org/10.1063/1.3272151 (3 pages) | Cited 4 times

Online Publication Date: 8 December 2009

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A recent publication [ F. I. Parra and P. J. Catto, Plasma Phys. Controlled Fusion 50, 065014 (2008) ] warned against the use of the lower order gyrokinetic Poisson equation at long wavelengths because the long wavelength, radial electric field must remain undetermined to the order the equation is obtained. Another reference [ W. W. Lee and R. A. Kolesnikov, Phys. Plasmas 16, 044506 (2009) ] criticizes these results by arguing that the higher order terms neglected in the most common gyrokinetic Poisson equation are formally smaller than the terms that are retained. This argument is flawed and ignores that the lower order terms, although formally larger, must cancel without determining the long wavelength, radial electric field. The reason for this cancellation is discussed. In addition, the origin of a nonlinear term present in the gyrokinetic Poisson equation [ F. I. Parra and P. J. Catto, Plasma Phys. Controlled Fusion 50, 065014 (2008) ] is explained.
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52.35.Bj Magnetohydrodynamic waves (e.g., Alfven waves)
52.65.Tt Gyrofluid and gyrokinetic simulations
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Response to “Comment on ‘On higher-order corrections to gyrokinetic Vlasov–Poisson equations in the long wavelength limit’” [ Phys. Plasmas 16, 124701 (2009)]

W. W. Lee and R. A. Kolesnikov

Phys. Plasmas 16, 124702 (2009); http://dx.doi.org/10.1063/1.3272154 (2 pages)

Online Publication Date: 8 December 2009

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We show in this response that the nonlinear Poisson’s equation in our original paper derived from the drift kinetic approach can be verified by using the nonlinear gyrokinetic Poisson’s equation of Dubin et al. [Phys. Fluids 26, 3524 (1983)] . This nonlinear contribution in ϕ2 is indeed of the order of k⊥4 in the long wavelength limit and remains finite for zero ion temperature, in contrast with the nonlinear term by Parra and Catto [Plasma Phys. Controlled Fusion 50, 065014 (2008) ], which is of the order of k⊥2 and diverges for Ti→0. For comparison, the leading term for the gyrokinetic Poisson’s equation in this limit is of the order of k⊥2ϕ.
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52.25.Dg Plasma kinetic equations
52.35.Bj Magnetohydrodynamic waves (e.g., Alfven waves)
52.65.Ff Fokker-Planck and Vlasov equation
52.35.Ra Plasma turbulence
52.55.Fa Tokamaks, spherical tokamaks
52.25.Fi Transport properties
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Comment on “Large amplitude double layers in a positively charged dusty plasma with nonthermal electrons” [ Phys. Plasmas 16, 063708 (2009) ]

Frank Verheest and Manfred A. Hellberg

Phys. Plasmas 16, 124703 (2009); http://dx.doi.org/10.1063/1.3276767 (4 pages) | Cited 1 time

Online Publication Date: 31 December 2009

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The claim by Djebli and Marif [Phys. Plasmas 16, 063708 (2009) ] that for the same plasma composition two sets of double layers with very different amplitudes and Mach numbers can be supported is erroneous and imputable to numerical errors. That one of these sets of double layers exhibits a decreasing trend is shown analytically to be impossible.
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52.27.Lw Dusty or complex plasmas; plasma crystals
52.35.Fp Electrostatic waves and oscillations (e.g., ion-acoustic waves)
52.35.Mw Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.)
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Response to “Comment on ‘Large amplitude double layers in a positively charged dusty plasma with nonthermal electrons’ ” [ Phys. Plasmas 16, 124703 (2009) ]

H. Marif and M. Djebli

Phys. Plasmas 16, 124704 (2009); http://dx.doi.org/10.1063/1.3276768 (3 pages) | Cited 1 time

Online Publication Date: 31 December 2009

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The nonlinear localized electrostatic modes are a consequence of the balance between the effects of the nonlinearity and the dispersion. The observation of such structures has been made possible in laboratory plasmas under controlled conditions.
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52.40.Kh Plasma sheaths
52.35.Mw Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.)
52.35.Sb Solitons; BGK modes
52.35.Fp Electrostatic waves and oscillations (e.g., ion-acoustic waves)
52.27.Lw Dusty or complex plasmas; plasma crystals
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