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- W2509773929 abstract "A multi-field sandpile model of tokamak plasmas is formulated for the first time to simulate the dynamic process with interaction between avalanche events on the fast/micro time-scale and diffusive transports on the slow/macro time-scale. The main characteristics of the model are that both particle and energy avalanches of sand grains are taken into account simultaneously. New redistribution rules of a sand-relaxing process are defined according to the transport properties of special turbulence which allows the uphill particle transport. Applying the model, we first simulate the steady-state plasma profile self-sustained by drift wave turbulences in the Ohmic discharge of a tokamak. A scaling law as f=aq0b+c for the relation of both center-density n(0) and electron (ion) temperatures Te(0)(Ti(0)) with the center-safety-factor q0 is found. Then interesting work about the nonlocal transport phenomenon observed in tokamak experiments proceeds. It is found that the core electron temperature increases rapidly in response to the edge cold pulse and inversely it decreases in response to the edge heat pulse. The results show that the nonlocal response of core electron temperature depending on the amplitudes of background plasma density and temperature is more remarkable in a range of gas injection rate. Analyses indicate that the avalanche transport caused by plasma drift instabilities with thresholds is a possible physical mechanism for the nonlocal transport in tokamaks. It is believed that the model is capable of being applied to more extensive questions occurring in the transport field." @default.
- W2509773929 created "2016-09-16" @default.
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- W2509773929 date "2016-08-01" @default.
- W2509773929 modified "2023-10-17" @default.
- W2509773929 title "Multi-field plasma sandpile model in tokamaks and applications" @default.
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- W2509773929 doi "https://doi.org/10.1063/1.4961922" @default.
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