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  • 1
    Electronic Resource
    Electronic Resource
    Scattering of electromagnetic waves by counter-rotating vortex streets in plasmas (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 901-905 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The scattering of electromagnetic waves from counter-rotating vortex streets associated with nonlinear convective cells in uniform plasmas has been considered. The vortex street solution of the Navier–Stokes or the Hasegawa–Mima (and of the "sinh-Poisson'') equation is adopted as a scatterer. Assuming arbitrary polarization and profile function for the incident electromagnetic field, a compact expression for the scattering cross section has been obtained. Specific results for the differential cross section are obtained for the case in which the incident beam has a Gaussian profile and propagates as an ordinary mode. The results show that when the characteristic wavelength of the vortex street (λv=2π/a) is larger than that of the incident electromagnetic wave (λi=2π/ki), the differential cross section dσ/dΩ has a very well-defined angular periodicity; in fact, it is a collection of Gaussians varying as exp[−f(kiw)2], where w is the waist and f is a function expressing a kind of "Bragg condition.'' On the other hand, for λi(approximately-greater-than)λv the incident electromagnetic beam is unable to distinguish the periodic structure of the vortex street. The effects of the vortex street as well as the incident beam parameters on the scattering cross section are examined. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871793
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  • 2
    Electronic Resource
    Electronic Resource
    Kinetic theory of photons in a plasma (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 3609-3614 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A kinetic equation for the photon gas in a relativistic plasma, neglecting the ions motion is derived. From this equation the fluid equations for the photon gas are obtained and their main properties are discussed. In order to illustrate the potential use of these equations to the study of new physical phenomena, which eventually can occur in relativistic plasmas, they are applied to three distinct situations. First, it is shown that a photon beam propagating in a plasma can excite a beam–plasma instability, similar to that occurring for the well-known case of electron beams. Second, it is shown that a bunch of photons, moving with constant velocity across a homogeneous plasma, can emit radiation similar to the Cherenkov effect associated with charged particles. Finally, the filamentation instability of a photon beam is discussed. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873080
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  • 3
    Electronic Resource
    Electronic Resource
    Interaction of ultrashort high-intensity laser pulses with atomic clusters (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 1084-1086 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A fully relativistic particle-in-cell code is used to simulate atomic cluster explosions following the interaction with ultrashort high-intensity laser pulses, investigating the dynamics of a 1 μm hydrogen cluster explosion and providing information about the time-resolved position, momentum, and energy of electrons and ions, for different laser intensities. The results indicate that the mechanism responsible for cluster expansion is Coulombic explosion producing MeV ions and electrons. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1345709
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  • 4
    Electronic Resource
    Electronic Resource
    Brownian motion of a dust particle in a plasma (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 674-677 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new version of the Brownian motion describing the motion of a dust particle in a turbulent plasma is considered. Here, the stochastic force acting on the dust particle is due to the fluctuations of the plasma potential and not due to the usual molecular collisions. Another significant difference is due to the fact that the dust electric charge is not constant but fluctuates with the potential. A four-dimensional formulation of the problem is also given. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872162
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  • 5
    Electronic Resource
    Electronic Resource
    Plasma potential profile determination by a new diagnostic based on neutral particle beam injection and laser induced fluorescence : Proceedings of the 12th topical conference on high temperature plasma diagnostics (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 908-911 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new method for the determination of the plasma potential radial profile based on the combination of a heavy neutral beam diagnostic, equipped with a light transparent multiple cell array detector, with a laser induced fluorescence system is presented. This profile is retrieved from the light intensities associated with decay processes following Doppler-shifted resonance excitation by the laser outside the plasma volume. Numerical studies were made for the tokamak ISTTOK assuming different sets of beam, laser, and plasma parameters. Results have shown that good spatial and temporal resolutions could be achieved with a 4 keV barium neutral beam and a 20 kW laser tuned at 4553 Å. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149328
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  • 6
    Electronic Resource
    Electronic Resource
    Linear mode coupling of lower-hybrid waves in a tokamak (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 2705-2712 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The linear coupling of electromagnetic modes propagating in a toroidal device is studied in detail, using a global or full wave approach. This study is directly linked to the spectral energy gap observed in lower-hybrid current drive experiments, but it is formulated in quite general terms and can eventually be applied to other kinds of waves. Exact solutions for the mode amplitudes and mode energies are derived, in two distinct regimes. The first is the degenerate regime corresponding to a single eigenfrequency and is equivalent to the fixed phase approximation used in the theory of nonlinear wave interaction. The second is the nondegenerate regime corresponding to different eigenfrequencies and is equivalent to the random phase approximation of the nonlinear theory. The stochastic or diffusive regimes studied in previous publications are also obtained when the quasiclassical or quasicontinuum limit of the nondegenerate regime is considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860140
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  • 7
    Electronic Resource
    Electronic Resource
    Diffusion of magnetic field lines in a toroidal geometry (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 87-94 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Diffusion of stochastic magnetic field lines is studied in a toroidal geometry. General expressions for the radial diffusion coefficient are obtained in various physically important situations. The Poincaré representation of magnetic field lines is reduced to discrete mappings and the corresponding diffusion coefficients are derived. The diffusion processes taking place near the threshold to global stochasticity are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859958
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  • 8
    Electronic Resource
    Electronic Resource
    The nonlinear three-wave interaction with a finite spectral width (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 3286-3294 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The nonlinear interaction of three waves propagating in an infinite plasma with a finite spectral bandwidth is studied. A Hamiltonian formulation of the interaction is used and, with the help of a projection operator method, generalized Langevin equations are derived for the wave field amplitudes. A simple form of the evolution equations, more complete than the usual fixed-phase equations, is obtained when the ballistic term and higher-order corrections of the memory effects in the Langevin equations are neglected. Approximate analytical solutions are derived using a multiple time scale method. These are compared with the results of numerical integration. A number of new qualitative features related to the finite spectral bandwidth are discussed in detail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866941
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  • 9
    Electronic Resource
    Electronic Resource
    Nonlinear Trivelpiece–Gould waves: Recurrence, harmonic cascade, and sidebands (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 787-795 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A theoretical and experimental study of Trivelpiece–Gould waves propagating in a magnetized plasma column is presented in this paper. In the experiments, these waves are excited by a radio frequency (rf) source, which also serves to create the plasma. Observation of nonlinear effects includes space and time recurrence effects, a wave spectrum containing a large number (up to 25) harmonics, and low-frequency sidebands. The theoretical model explains the recurrence effects as a consequence of multiple nonlinear interactions between the fundamental wave and its harmonics. A good agreement is found between theory and the experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860975
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  • 10
    Electronic Resource
    Electronic Resource
    Stationary Coverage of a Stochastic Adsorption–Desorption Process with Diffusional Relaxation (1998)
    Springer
    Journal of statistical physics 92 (1998), S. 651-658 
    Details
    ISSN: 1572-9613
    Keywords: Stochastic lattice gas ; dimers ; stationary state
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We show that it is possible to derive the stationary coverage of an adsorption–desorption process of dimers with diffusional relaxation with a very simple ansatz for the stationary distribution of the process supplemented by a hypothesis of global balance. Our approach is compared to the exact result and we seek to understand its validity within an instance of the model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1023044822735
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