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  • 1
    Electronic Resource
    Electronic Resource
    Parallel heat diffusion and subdiffusion in random magnetic fields (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 777-787 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Stochastic magnetic fields in a weakly collisional plasma enhance the collisionality of electrons in the medium compared to the classical Spitzer values. The reduction in the thermal conductivity may play an important role in the evolution of galaxy clusters. This work extends prior work by examining the parallel propagation of electrons in plasma media where the magnetic field amplitude sampled along a field line is a stochastic function of the distance. New physics is exhibited when many large-amplitude magnetic mirrors are present; the parallel transport becomes subdiffusive rather than diffusive in this limit. The transition between diffusion and subdiffusion can be obtained from properties of the asymptotic solution to the kinetic equation in the vicinity of a solitary magnetic mirror. This transition has been computed as a function of the power law exponent in the distribution of mirror maxima, and the asymptotic scaling of the mean-squared electron displacement with time has been obtained in these systems as a function of this exponent. Monte Carlo comparisons are in agreement with these results. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1344920
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  • 2
    Electronic Resource
    Electronic Resource
    Self-trapping of a rotating ion ring (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 4030-4034 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A fluid model is presented that describes the linear evolution of a thin layer of beam ions in a conducting cylindrical cavity with a narrow rotating beam layer, and a dispersion relation is computed for the low-frequency electromagnetic response of the system. For a broad range of ion ring parameters this configuration is found to be unstable to the generation of Alfvénic fluctuations. Simple estimates are provided of the time needed for these fluctuations to self-trap the ion beam. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1386943
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  • 3
    Electronic Resource
    Electronic Resource
    Quiet direct simulation of plasmas : Review,Tutorial and Invited Papers from the 43rd Annual Meeting of the APS Division of Plasma Physics (2002)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 9 (2002), S. 1898-1904 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new approach to particle simulation, called "quiet direct simulation Monte Carlo" (QDSMC), is described that can be applied to many problems of interest, including hydrodynamics, magnetohydrodynamics (MHD), and the modeling of collision plasmas. The essence of QDSMC is the use of carefully chosen weights for the particles (e.g., Gauss–Hermite, for Maxwellian distributions), which are destroyed each time step after the particle information is deposited onto the grid and reconstructed at the beginning of the next time step. The method overcomes the limited dynamical range and statistical noise typically found in particle simulations. In this article QDSMC is applied to hydrodynamics and MHD test problems, and its suitability for modeling semi-collisional plasma dynamics is considered. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1452732
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  • 4
    Electronic Resource
    Electronic Resource
    The density and clustering of magnetic nulls in stochastic magnetic fields (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 4222-4228 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Many processes in astrophysical plasmas, such as magnetic reconnection and current sheet formation, are sensitive to the topology of the magnetic field. Magnetic nulls are special in a topological sense because they are connected to an infinite number of field lines. Complicated magnetic field geometries may have many nulls and many null–null lines. This work examines the statistical properties of zeros in a random divergence-free vector field model. An analytic expression for the density of nulls is obtained as a function of the dissipation and integral length scales of the random field and the exponent of the energy spectrum of the field. For a broad class of spectra which are similar to the spectra of turbulent cascades magnetic nulls form self-similar clusters. The fractal dimension of the set of nulls is computed as a function of the power law index of the random field. Complicated magnetic topologies may possess tangled webs of nulls and null–null lines. These webs of nulls may be the sites of current sheet formation and heating, and they may modify the properties of particle transport in turbulent plasma media. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873689
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  • 5
    Electronic Resource
    Electronic Resource
    Laser acceleration of quasi-monoenergetic MeV ion beams (2006)
    [s.l.] : Nature Publishing Group
    Nature 439 (2006), S. 441-444 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Acceleration of particles by intense laser–plasma interactions represents a rapidly evolving field of interest, as highlighted by the recent demonstration of laser-driven relativistic beams of monoenergetic electrons. Ultrahigh-intensity lasers can produce accelerating fields of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature04400
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