
arXiv: 1403.5896
The phenomena of nonlocal transport in magnetically confined plasma are theoretically analyzed. A hybrid model is proposed, which brings together the notion of inverse energy cascade, typical of drift-wave- and two-dimensional fluid turbulence, and the ideas of avalanching behavior, associable with self-organized critical (SOC) behavior. Using statistical arguments, it is shown that an amplification mechanism is needed to introduce nonlocality into dynamics. We obtain a consistent derivation of nonlocal Fokker-Planck equation with space-fractional derivatives from a stochastic Markov process with the transition probabilities defined in reciprocal space. The hybrid model observes the Sparre Andersen universality and defines a new universality class of SOC.
11 pages, 2 figures; submitted to Physics Letters A. arXiv admin note: substantial text overlap with arXiv:1307.0387
drift-wave turbulence, fractional kinetics, random processes and Lévy flights, FOS: Physical sciences, Statistical mechanics of plasmas, self-organized criticality, Chaotic Dynamics (nlin.CD), Nonlinear Sciences - Chaotic Dynamics, Fokker-Planck equations
drift-wave turbulence, fractional kinetics, random processes and Lévy flights, FOS: Physical sciences, Statistical mechanics of plasmas, self-organized criticality, Chaotic Dynamics (nlin.CD), Nonlinear Sciences - Chaotic Dynamics, Fokker-Planck equations
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