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A self-organized criticality model for ion temperature gradient mode driven turbulence in confined plasma

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A self-organized criticality model for ion temperature gradient mode driven turbulence in confined plasma (EN)
Pisokas, TH (EN)
Isliker, H (EN)
Vlahos, L (EN)
Strintzi, D (EN)
journalArticle (EN)
2014-03-01T01:32:32Z
2010 (EN)
A new self-organized criticality (SOC) model is introduced in the form of a cellular automaton (CA) for ion temperature gradient (ITG) mode driven turbulence in fusion plasmas. Main characteristics of the model are that it is constructed in terms of the actual physical variable, the ion temperature, and that the temporal evolution of the CA, which necessarily is in the form of rules, mimics actual physical processes as they are considered to be active in the system, i.e., a heating process and a local diffusive process that sets on if a threshold in the normalized ITG R/L-T is exceeded. The model reaches the SOC state and yields ion temperature profiles of exponential shape, which exhibit very high stiffness, in that they basically are independent of the loading pattern applied. This implies that there is anomalous heat transport present in the system, despite the fact that diffusion at the local level is imposed to be of a normal kind. The distributions of the heat 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 with experimental results. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3458668] (EN)
Physics, Fluids & Plasmas (EN)
Diffusive process (EN)
Ion temperature gradient (EN)
Ion temperature gradient modes (EN)
Physical variables (EN)
Confined plasmas (EN)
Ion temperature profiles (EN)
Loading patterns (EN)
Heating process (EN)
Temporal evolution (EN)
Ion temperature (EN)
Main characteristics (EN)
Self-organized criticality (EN)
Physical process (EN)
Pattern recognition systems (EN)
Turbulence (EN)
High stiffness (EN)
Thermal gradients (EN)
Ions (EN)
Cellular automata (EN)
Fusion plasmas (EN)
Heat transport (EN)
Basic properties (EN)
Plasma confinement (EN)
Criticality (nuclear fission) (EN)
Power-law (EN)
Physics of Plasmas (EN)
English
AMER INST PHYSICS (EN)
National Technical University of Athens
Digital Library of National Technical University of Athens | Dspace@NTUA
Κεντρική Βιβλιοθήκη Ε.Μ.Π.
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