Blar i forfatter "Milovanov, Alexander V."

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    • E-pile model of self-organized criticality 

      Rasmussen, Jens Juul; Milovanov, Alexander V.; Rypdal, Kristoffer (Working paper; Arbeidsnotat, 2007-11-28)
      The concept of percolation is combined with a self-consistent treatment of the interaction between the dynamics on a lattice and the external drive. Such a treatment can provide a mechanism by which the system evolves to criticality without fine tuning, thus offering a route to self-organized criticality (SOC) which in many cases is more natural than the weak random drive combined with ...

    • Electron fishbones: theory and experimental evidence 

      Milovanov, Alexander V.; Zonca, F.; Buratti, P.; Cardinali, A.; Chen, L.; Dong, J.-Q.; Long, Y.-X.; Romanelli, F.; Smeulders, P.; Wang, L.; Wang, Z.-T.; Castaldo, C.; Cesario, R.; Giovannozzi, E.; Marinucci, M.; Ridolfini, V. Pericoli (Journal article; Tidsskriftartikkel; Peer reviewed, 2007-07-19)
      We discuss the processes underlying the excitation of fishbone-like internal kink instabilities driven by supra-thermal electrons generated experimentally by different means: Electron Cyclotron Resonance Heating (ECRH) and by Lower Hybrid (LH) power injection. The peculiarity and interest of exciting these electron fishbones by ECRH only or by LH only is also analyzed. Not only the mode stability ...

    • Self-similar transport processes in a two-dimensional realization of multiscale magnetic field turbulence 

      Milovanov, Alexander V.; Chiaravalloti, Francesco; Zimbardo, Gaetano (Journal article; Tidsskriftartikkel; Peer reviewed, 2004-12-14)
      We present the results of a numerical investigation of charged-particle transport across a synthesized magnetic configuration composed of a constant homogeneous background field and a multiscale perturbation component simulating an effect of turbulence on the microscopic particle dynamics. Our main goal is to analyze the dispersion of ideal test particles faced to diverse conditions in the turbulent ...

    • Stretched exponential relaxation and ac universality in disordered dielectrics 

      Rasmussen, Jens Juul; Milovanov, Alexander V.; Rypdal, Kristoffer (Working paper; Arbeidsnotat, 2007-05-30)
      This paper is concerned with the connection between the properties of dielectric relaxation and ac (alternating-current) conduction in disordered dielectrics. The discussion is divided between the classical linear-response theory and a self-consistent dynamical modeling. The key issues are, stretched exponential character of dielectric relaxation, power-law power spectral density, and anomalous ...

    • Stretched-exponential decay functions from a self-consistent model of dielectric relaxation 

      Milovanov, Alexander V.; Rasmussen, Jens Juul; Rypdal, Kristoffer (Working paper; Arbeidsnotat, 2007-07-22)
      There are many materials whose dielectric properties are described by a stretched exponential, the so-called Kohlrausch-Williams-Watts (KWW) relaxation function. Its physical origin and statistical-mechanical foundation have been a matter of debate in the literature. In this paper we suggest a model of dielectric relaxation, which naturally leads to a stretched exponential decay function. Some ...