Minjun J Choi, Jae-Min Kwon, Lei Qi, P H Diamond, T S Hahm, Hogun Jhang, Juhyung Kim, M Leconte, Hyun-Seok Kim, Jisung Kang, Byoung-Ho Park, Jinil Chung, Jaehyun Lee, Minho Kim, Gunsu S Yun, Y U Nam, Jaewook Kim, Won-Ha Ko, K D Lee, J W Juhn and the KSTAR Team
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引用次数: 0
Abstract
The self-organization is one of the most interesting phenomena in the non-equilibrium complex system, generating ordered structures of different sizes and durations. In tokamak plasmas, various self-organized phenomena have been reported, and two of them, coexisting in the near-marginal (interaction dominant) regime, are avalanches and the E × B staircase. Avalanches mean the ballistic flux propagation event through successive interactions as it propagates, and the E × B staircase means a globally ordered pattern of self-organized zonal flow layers. Various models have been suggested to understand their characteristics and relation, but experimental researches have been mostly limited to the demonstration of their existence. Here we report detailed analyses of their dynamics and statistics and explain their relation. Avalanches influence the formation and the width distribution of the E × B staircase, while the E × B staircase confines avalanches within its mesoscopic width until dissipated or penetrated. Our perspective to consider them the self-organization phenomena enhances our fundamental understanding of them as well as links our findings with the self-organization of mesoscopic structures in various complex systems.
自组织是非平衡复杂系统中最有趣的现象之一,可产生不同大小和持续时间的有序结构。据报道,在托卡马克等离子体中存在多种自组织现象,其中两种共存于近边缘(相互作用占主导地位)体系中,它们是雪崩和 E × B 阶梯。雪崩指的是在传播过程中通过连续相互作用的弹流传播事件,而 E × B 阶梯指的是自组织带状流层的全局有序模式。人们提出了各种模型来理解它们的特征和关系,但实验研究大多仅限于证明它们的存在。在此,我们将详细分析它们的动力学和统计量,并解释它们之间的关系。雪崩影响 E × B 阶梯的形成和宽度分布,而 E × B 阶梯则将雪崩限制在其介观宽度内,直至消散或穿透。我们将它们视为自组织现象的观点增强了我们对它们的基本理解,并将我们的发现与各种复杂系统中介观结构的自组织联系起来。
期刊介绍:
Plasma Physics and Controlled Fusion covers all aspects of the physics of hot, highly ionised plasmas. This includes results of current experimental and theoretical research on all aspects of the physics of high-temperature plasmas and of controlled nuclear fusion, including the basic phenomena in highly-ionised gases in the laboratory, in the ionosphere and in space, in magnetic-confinement and inertial-confinement fusion as well as related diagnostic methods.
Papers with a technological emphasis, for example in such topics as plasma control, fusion technology and diagnostics, are welcomed when the plasma physics is an integral part of the paper or when the technology is unique to plasma applications or new to the field of plasma physics. Papers on dusty plasma physics are welcome when there is a clear relevance to fusion.