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  • 1
    Electronic Resource
    Electronic Resource
    Stimulated scattering of relativistically strong radiation from an underdense plasma at high-frequency harmonics (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 3382-3389 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The theory of stimulated scattering of relativistically strong, arbitrarily polarized laser radiation from an underdense plasma is developed. It is shown that, in addition to the scattering at the near-carrier frequency, the scattering at the odd and even high-frequency harmonics can occur in a wide range of angles. The growth rates of the instability associated with the harmonic generation are obtained as functions of the scattering angle. It is shown that, at certain directions, the growth rates for higher harmonics can exceed the growth rate for the fundamental harmonic. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872479
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  • 2
    Electronic Resource
    Electronic Resource
    On the phase velocity of plasma waves in a self-modulated laser wake-field accelerator (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 3121-3128 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The properties of the wake field excited by a flattop laser pulse with a sharp leading edge and a power below the critical one for relativistic self-focusing are studied analytically and numerically with emphasis on the phase velocity of the plasma wave. The paraxial model describing modulation of the pulse spot size is shown to provide a good quantitative description, including preexponential factors, of the wake field during the linear stage of the resonant self-modulation instability. Though the phase velocity of the excited plasma wave is shown to be close to the group velocity of the laser pulse, the relativistic γ-factor corresponding to the phase velocity, which is a crucial parameter for particle acceleration, can be substantially less than that of the group velocity. Fortunately, for the considered three-dimensional regime of self-modulation, the noticeable difference between these two γ-factors takes place only in the initial stage of the instability and vanishes in the later stages. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871659
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  • 3
    Electronic Resource
    Electronic Resource
    Nonlinear depletion of ultrashort and relativistically strong laser pulses in an underdense plasma (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 1935-1942 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The depletion of a relativistically strong laser pulse in the course of interaction with underdense plasmas is considered. The driving mechanisms of distortion and fast depletion of the pulse due to the nonlinear plasma wake excitation are discussed. The role of the backward stimulated Raman scattering in the process of the leading front steepening is traced. Electron acceleration and heating due to plasma wave breaking are demonstrated. The evidence that the final stage of the pulse depletion can be accompanied by the formation of relativistically strong solitonlike electromagnetic modes is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860046
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetic reconnection in electron magnetohydrodynamics (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 2499-2508 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic field dynamics and reconnection processes in a highly conducting plasma are investigated in the regimes where Ohm's law is dominated by the Hall term, using a single (electron) fluid description (electron magnetohydrodynamics). In these regimes, which correspond to the frequency range of the so-called whistler (helicon) mode, the electromagnetic field is nearly force free: (j×B)/c+eneE=0. The evolution of the magnetic field in the vicinity of an X line is discussed in the linear and nonlinear regimes. The propagation of whistler waves results in the steepening of their wave front and in the increase of the electric current density in the neighborhood of the magnetic separatrix surfaces. Small-scale magnetic reconnection occurs near surfaces where k⋅B=0, with k the mode wave number, and tearing-type modes can be unstable due to the effect of electron inertia. A class of exact self-similar solutions is obtained. These describe, within the scope of a local approximation, the nonlinear time development (magnetic collapse) of the singularities that occur in three-dimensional magnetic configurations. Flat electric current sheets are formed during this collapse. Finally, the rate of reconnection in the electron-magnetohydrodynamic frequency range is estimated in the framework of a steady-state approximation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860467
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  • 5
    Electronic Resource
    Electronic Resource
    Particle simulations of boundary-condition and hf-field effects on strong double layers in a collisionless bounded plasma (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 2871-2884 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The evolution of electrostatic double layers (DL's) in a collisionless plasma diode with injection of current-carrying plasma from both ends is systematically investigated by means of particle-in-cell simulations. These simulations have been performed with the one-dimensional electrostatic bounded-plasma codes PDW1 [J. Comput. Phys. 80, 253 (1989)] and PDP1 [J. Appl. Phys. 69, 2008 (1991)]. It is found that asymmetry in the injection conditions can shift the DL toward one of the boundaries and may either stabilize or destabilize it. If a given dc potential difference is applied between the electrodes and a time-independent DL exists, the latter is always found to be adjacent to the low-potential boundary of the diode. Application of a strong hf field, modeled by an ac bias, can lead to stabilization or destabilization of the DL, depending on the driving frequency. For boundary conditions corresponding to a given constant external-circuit current, the DL's observed in the simulations are transient and decay on the time scale on which the diode fills with plasma. Of particular interest is the fact that in none of the simulations reported has a time-independent DL separating two extended regions of quasineutral plasma been obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860161
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  • 6
    Electronic Resource
    Electronic Resource
    Cosmology Synchrotron radiation and quantum gravity (2004)
    [s.l.] : Nature Publishing Group
    Nature 428 (2004), S. 0 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Arising from: Jacobson, T., Liberati, S. & Mattingly, D. Nature 424, 1019–1021 (2003) Quantum gravity may cause the vacuum to act as a non-trivial medium (space–time foam), which alters the standard Lorentz relation ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature02481
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  • 7
    Electronic Resource
    Electronic Resource
    Laser action in some single and binary organic scintillator solutions (1970)
    Springer
    Optical and quantum electronics 2 (1970), S. 235-237 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Experimental results are presented, which show that it is necessary to consider the absorption of pump radiation by electronically excited molecules for a proper interpretation of the operation of liquid organic lasers. The possibility of the use of binary organic scintillator solutions to obtain laser action in a rather broad spectral region is shown.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01476394
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  • 8
    Electronic Resource
    Electronic Resource
    Finite element simulation of the loss of stable resistance in a foundation-soil system (1992)
    Springer
    Archive of applied mechanics 62 (1992), S. 316-328 
    Details
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Übersicht Die Grundlagen für numerische Modellierung des nichtlinearen Verhaltens vom System Fundament-Bodengründung nach der Finite-Element-Methode werden dargelegt. Angewandt werden Stoffgesetze, die die Entwicklung plastischer Bereiche im Baugrunde und Rißbildung im Beton berücksichtigen. Bekanntlich entwickeln sich diese Erscheinungen in der Regel monoton mit der Belastungssteigerung, können sich aber auch lawinenartig entwickeln. Letztere Erscheinung kann mit der Erschöpfung der Tragfähigkeit des Systems Fundament-Bodengründung oder mit der Stabilisierung des Systems endan, worauf ein weiterer Widerstand gegen die steigende Belastung möglich ist. Ausgearbeitete Algorithmen und ein Programm erlauben es, beide Erscheinungen zu modellieren. Rechenbeispiele sind angeführt.
    Notes: Summary The fundamentals of the methodology for numerical simulation of non-linear behavior of the foundation-subsoil system by the finite element method are described. Constitutive laws governing the evolution of plastic zones in soil and crack development in concrete are used. These processes are known to proceed monotonously as the load increases, but can suddenly become avalanche-like. The latter phenomenon can terminate in the exhaustion of bearing capacity of the foundation subsoil system or in the stabilization of this system's state, and may be followed by an increase in resistance to loads. The developed algorithms and a code allow simulation of both phenomena. Examples of analysis are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00788639
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  • 9
    Electronic Resource
    Electronic Resource
    Anti-helium flux as a signature for antimatter globular clusters in our Galaxy (2000)
    Springer
    Physics of atomic nuclei 63 (2000), S. 233-239 
    Details
    ISSN: 1063-7788
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Alpha Magnetic Spectrometer experiment is shown to be sensitive to test the hypothesis on the existence of antimatter globular cluster in our Galaxy. The hypothesis follows from the analysis of possible tests for the mechanisms of baryosynthesis and uses antimatter domains in the matter-dominated Universe as the probe for the physics underlying the origin of matter. The interval of masses for the antimatter in our Galaxy is fixed from below by the condition of antimatter domain survival in the matter-dominated Universe and from above by the observed gamma-ray flux. For this interval, the expected fluxes of anti-helium-3 and anti-helium-4 are calculated with account for their interaction with the matter in the Galaxy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.855627
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  • 10
    Electronic Resource
    Electronic Resource
    Percolation model of SHF breakdown in a dielectric (1996)
    Springer
    Computational mathematics and modeling 7 (1996), S. 131-135 
    Details
    ISSN: 1573-837X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract A percolation model of gas-discharge evolution is described in the cellular automaton paradigm, which makes it possible to overcome difficulties associated with the complex geometry of discharge structures. The two-dimensional case is considered, when the potential of the discharge region is zero and the potential on the outer boundary varies harmonically. Both linear and circular polarization of the external field is allowed. Typical fractal structures are derived, and their fractal dimension is calculated by two methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01131340
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