Mesoscopic transport in KSTAR plasmas: avalanches and the E × B staircase
Plasma Physics and Controlled Fusion(2022)
摘要
The self-organization is one of the most interesting phenomena in the
non-equilibrium complex system, generating ordered structures of various size
and duration. 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
detail 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 on
them as well as links our findings with self-organization of mesoscopic
structures in various complex systems.
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