The E x B staircase as the self-organization in non-equilibrium complex systems

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• Minjun J Choi (Korea Institute of Fusion Energy)
• Thursday 18 January 2024, 10:00-11:00
• Seminar Room 1, Newton Institute.

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ADIW01 - Layering — A structure formation mechanism in oceans, atmospheres, active fluids and plasmas

The self-organization is one of the most interesting phenomena in the non-equilibrium complex system, generating ordered structures of various size and duration. The physical mechanism and characteristics of the self-organization phenomena are closely related with the underlying transport mechanism and characteristics. In tokamak plasmas, globally self-organized mini transport barriers, the $E \times B$ staircase, are observed in the particular transport regime where non-diffusive flux propagation events, the avalanche, are prevalent. In this talk, detail characteristics of both the avalanche transport and the $E \times B$ staircase in KSTAR plasmas are analyzed to understand their relation. The avalanche transport is found to have strong influences on the formation and the width distribution of the $E \times B$ staircase, while the $E \times B$ staircase confines the avalanche propagation within its width until it is dissipated. A perspective to consider the $E \times B$ staircase as the self-organization near an non-equilibrium critical state provides understanding of not only its dynamics and statistics but also the relation with the stationary internal transport barrier. In some sense, the $E \times B$ staircase and the avalanche can be thought as two faces of the same thing. They both efficiently remove an excess energy from the system so that it can reach a stationary state. Which process will be chosen may depend on an instant status of environment.

This talk is part of the Isaac Newton Institute Seminar Series series.

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