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Study of geometrical effects on the characteristics of metallic double-walled carbon nanotube waveguides through quantum hydrodynamics
Posted on June 4th, 2009 No commentsY. Ahmadizadeh, C. Javaherian, and B. Shokri<br/> By assuming the metallic double-walled carbon nanotubes as two coaxial free electron gas layers with linearized hydrodynamic model, it is shown that surface plasmons coupled with electromagnetic fields can be excited on a metallic double-walled carbon nanotube and propagate along its axis. Dispersio … [Phys. Plasmas 16, 063501 (2009)] published Thu Jun 4, 2009.
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Modeling positive ion current to a planar probe in low-pressure electronegative discharges
Posted on June 4th, 2009 No commentsT. H. Chung<br/> A fluid model is utilized to describe the plasma-sheath boundary for a negatively biased planar probe immersed in electronegative plasmas. The model equations are solved on the scale of the electron Debye length and calculate the spatial distributions of electric potential, velocity, and density of … [Phys. Plasmas 16, 063503 (2009)] published Thu Jun 4, 2009.
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Drag coefficient of the weakly ionized plasma in the high Knudsen number regime
Posted on June 4th, 2009 No commentsHong-Yu Chu, Man-Chon Si, and Shang-Bin Lin<br/> The drag force acting on a micron-sized polystyrene particle in the high Knudsen number regime is investigated. Analysis of the particle trajectories in stationary neutral argon gas environment suggests the damping time constant tau[proportional]p and Epstein drag force coefficient delta=1.40. The n … [Phys. Plasmas 16, 063704 (2009)] published Thu Jun 4, 2009.
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Wave coupling in sheet- and multiple-beam traveling-wave tubes
Posted on June 4th, 2009 No commentsGregory S. Nusinovich, Simon J. Cooke, Moti Botton, and Baruch Levush<br/> To increase the power level of the sources of coherent electromagnetic radiation at frequencies from 100 GHz up to the terahertz range it makes sense to develop devices with a spatially extended interaction space. Sheet-beam and multiple-beam devices belong to the category. In the present paper the … [Phys. Plasmas 16, 063102 (2009)] published Thu Jun 4, 2009.
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Whistler wave radiation from a loop antenna located in a cylindrical density depletion
Posted on June 4th, 2009 No commentsAlexander V. Kudrin, Pavel V. Bakharev, Catherine Krafft, and Tatyana M. Zaboronkova<br/> Electromagnetic radiation from sources in a magnetoplasma containing a radially nonuniform cylindrical density depletion is considered. Using a rigorous solution for the total field comprising both the discrete and continuous parts of the spatial spectrum of excited wave mechanicss, the radiation resistance o … [Phys. Plasmas 16, 063502 (2009)] published Thu Jun 4, 2009.
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Simulation of asymmetric solar wind electron distributions
Posted on June 4th, 2009 No commentsChang-Mo Ryu, Hee-Chul Ahn, Tongnyeol Rhee, P. H. Yoon, L. F. Ziebell et al.<br/> The electron distributions detected in the solar wind feature varying degrees of anisotropic high-energy tail. In a recent work the present authors numerically solved the one-dimensional electrostatic weak turbulence equations by assuming that the solar wind electrons are initially composed of therm … [Phys. Plasmas 16, 062902 (2009)] published Thu Jun 4, 2009.
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Waves and turbulence in magnetohydrodynamic direct numerical simulations
Posted on June 4th, 2009 No commentsPablo Dmitruk and W. H. Matthaeus<br/> Direct numerical simulations of the incompressible MHD equations with a uniform background magnetic field in a turbulent regime are performed to assess the relative importance of broadband turbulent fluctuations and wave mechanicslike fluctuations that are associated with an Alfven wave mechanics dispersion relation. T … [Phys. Plasmas 16, 062304 (2009)] published Wed Jun 3, 2009.
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Solitary wake field microdynamics of the pulsed laser induced microbubbles in three-dimensional dusty plasma liquids
Posted on June 4th, 2009 No commentsChen-Yu Tsai, Lee-Wen Teng, Mei-Chu Chang, Yu-Ping Tseng, and Lin I<br/> The Eulerian/Lagrangian dynamics in the narrow wake field of the dusty plasma bubble is explored by directly tracking dust motion at the microscopic level. The bubble is induced by the focused laser pulse ablation in three-dimensional quiescent dusty plasma liquids operated in the pressure higher th … [Phys. Plasmas 16, 063702 (2009)] published Wed Jun 3, 2009.
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Dust grain oscillations in two-dimensional hexagonal dusty plasma crystals in the presence of a magnetic field
Posted on June 4th, 2009 No commentsB. Farokhi, M. Shahmansouri, and P. K. Shukla<br/> The influence of a constant magnetic field on the propagation of dust-lattice wave mechanicss in a two-dimensional hexagonal strongly coupled dusty plasma crystal is considered. The expression for the wave mechanics dispersion relation clearly shows that high- and low-frequency dust lattice vibrations exist as a result … [Phys. Plasmas 16, 063703 (2009)] published Wed Jun 3, 2009.
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Transport scaling in interchange-driven toroidal plasmas
Posted on June 4th, 2009 No commentsPaolo Ricci and B. N. Rogers<br/> Two-dimensional fluid simulations of a simple magnetized torus are presented, in which the vertical and toroidal components of the magnetic field create helicoidal field lines that terminate on the upper and lower walls of the plasma chamber. The simulations self-consistently evolve the full radial … [Phys. Plasmas 16, 062303 (2009)] published Wed Jun 3, 2009.