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Abstract: A new Self-Organized Criticality SOC model is introduced in the form of aCellular Automaton CA for ion temperature gradient ITG mode driventurbulence in fusion plasmas. Main characteristics of the model are that it isconstructed in terms of the actual physical variable, the ion temperature, andthat the temporal evolution of the CA, which necessarily is in the form ofrules, mimics actual physical processes as they are considered to be active inthe system, i.e. a heating process and a local diffusive process that sets onif a threshold in the normalized ion temperature gradient R-L T is exceeded.The model reaches the SOC state and yields ion temperature profiles ofexponential shape, which exhibit very high stiffness, in that they basicallyare independent of the loading pattern applied. This implies that there isanomalous heat transport present in the system, despite the fact that diffusionat the local level is imposed to be of a normal kind. The distributions of theheat fluxes in the system and of the heat out-fluxes are of power-law shape.The basic properties of the model are in good qualitative agreement withexperimental results.



Autor: Heinz Isliker 1, Theophilos Pisokas 1, Dafni Strintzi 2, Loukas Vlahos 1 1 Section of Astrophysics, Astronomy and Mechanics, Depa

Fuente: https://arxiv.org/







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