Self-Organized Criticality Theory Model of Thermal Sandpile

Self-Organized Criticality Theory Model of Thermal Sandpile
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热力沙堆自组织临界理论模型

DOI:
10.1088/0256-307x/32/9/094501
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发表时间:
2015-10
影响因子:
3.5
通讯作者:
许健强
许健强
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
彭晓东;许健强

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首次建立了热沙堆的自组织临界模型,模拟了快时间尺度上的雪崩事件与慢时间尺度上的扩散输运相互作用的动力学过程。该模型的主要特点是同时考虑了沙粒的粒子雪崩和能量雪崩。详细分析了间歇输运和改进约束的性质。结果表明,在托卡马克实验中观察到的低约束模中的斑点和高约束模中的边缘局域模等间歇现象不仅由边缘等离子体物理决定,而且还受堆芯等离子体动力学的影响。
A self-organized criticality model of a thermal sandpile is formulated for the first time to simulate the dynamic process with interaction between avalanche events on the fast time scale and diffusive transports on the slow time scale. The main characteristics of the model are that both particle and energy avalanches of sand grains are considered simultaneously. Properties of intermittent transport and improved confinement are analyzed in detail. The results imply that the intermittent phenomenon such as blobs in the low confinement mode as well as edge localized modes in the high confinement mode observed in tokamak experiments are not only determined by the edge plasma physics, but also affected by the core plasma dynamics.
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