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首页> 外文期刊>Plasma physics and controlled fusion >Cellular automata model for transitions to improved confinement regimes in fusion plasma
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Cellular automata model for transitions to improved confinement regimes in fusion plasma

机译：元胞自动机模型，可在融合等离子体中过渡到改善的约束机制

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摘要

In magnetically confined plasmas, the second derivative of the density is known to be related to the E x B velocity shear that rules the transitions to improved confinement regimes. In this work we present a cellular automata model for transport that includes diffusion and avalanche-like mechanisms controlled by critical parameters. Assuming the hypothesis that a strong negative value of the second derivative of the density reduces the strength of avalanches, the model shows the emergence of different confinement regimes that are found to be analogue to low (L), high (H) and very high (VH) confinement modes in real plasma. Transitions between such regimes can be controlled by the parameter representing the fuelling intensity. In particular, the model reproduces the formation of a pedestal during the transition from L to H confinement regimes, and shows hysteresis phenomena.
机译：在磁约束等离子体中，密度的二阶导数与E x B速度剪切有关，E x B速度剪切决定了向改善的约束状态的过渡。在这项工作中，我们提出了一种用于传输的细胞自动机模型，该模型包括扩散和受关键参数控制的雪崩样机制。假设密度的二阶导数的强负值会降低雪崩的强度，该模型显示出现了类似于低（L），高（H）和非常高（ VH）在实际等离子体中的约束模式。可以通过代表加油强度的参​​数来控制这种状态之间的过渡。特别地，该模型再现了从L到H约束状态过渡期间基座的形成，并显示出滞后现象。

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