Abstract
A one-dimensional cellular automaton is defined without the critical gradient rule(Δh>Δhc) which is essential to the existence of avalanches in self-organized criticality(SOC) models,Instead.only the local diffustion rule is used.howeer,the characteristics of SOC,such as the bursty behaviour.power-law decay in fluctuation spectra,selfsimilarity over a broad range of scales and long-time correlations,are still observed in these numerical experiments.This numerical model is established to suggest that the bursty events and the incremental diffusion observed universally in fusion experiments do not necessaryily imply the submarginal dynamics.
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