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Self-organized criticality in MHD driven plasma edge turbulence |
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| Authors: | GZ dos Santos Lima KC IaroszAM Batista IL CaldasZO Guimarães-Filho RL VianaSR Lopes IC NascimentoYuK Kuznetsov |
| Institution: | a Escola de Ciências e Tecnologia, Universidade Federal do Rio Grande do Norte, 59014-615, Natal, RN, Brazil b Programa de Pós-Graduação em Física, Universidade Estadual de Ponta Grossa, 84030-900, Ponta Grossa, PR, Brazil c Instituto de Física, Universidade de São Paulo, 05508-090, SP, Brazil d IIFS/PIIM, Université de Provence, France e Departamento de Física, Universidade Federal do Paraná, 81531-990, Curitiba, PR, Brazil |
| Abstract: | We analyze long-range time correlations and self-similar characteristics of the electrostatic turbulence at the plasma edge and scrape-off layer in the Tokamak Chauffage Alfvén Brésillien (TCABR), with low and high Magnetohydrodynamics (MHD) activity. We find evidence of self-organized criticality (SOC), mainly in the region near the tokamak limiter. Comparative analyses of data before and during the MHD activity reveals that during the high MHD activity the Hurst parameter decreases. Finally, we present a cellular automaton whose parameters are adjusted to simulate the analyzed turbulence SOC change with the MHD activity variation. |
| Keywords: | Plasma Turbulence Self-organized criticality MHD activity |
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