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SUMMARY:The E x B staircase as the self-organization in non-equilibrium co
 mplex systems - Minjun J Choi (Korea Institute of Fusion Energy)
DTSTART:20240118T100000Z
DTEND:20240118T110000Z
UID:TALK208501@talks.cam.ac.uk
DESCRIPTION: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 t
 he self-organization phenomena are closely related with the underlying tra
 nsport mechanism and characteristics. In tokamak plasmas\, globally self-o
 rganized mini transport barriers\, the $E \\times B$ staircase\, are obser
 ved in the particular transport regime where non-diffusive flux propagatio
 n events\, the avalanche\, are prevalent. In this talk\, detail characteri
 stics of both the avalanche transport and the $E \\times B$ staircase in K
 STAR plasmas are analyzed to understand their relation. The avalanche tran
 sport is found to have strong influences on the formation and the width di
 stribution of the $E \\times B$ staircase\, while the $E \\times B$ stairc
 ase confines the avalanche propagation within its width until it is dissip
 ated. A perspective to consider the $E \\times B$ staircase as the self-or
 ganization near an non-equilibrium critical state provides understanding o
 f not only its dynamics and statistics but also the relation with the stat
 ionary internal transport barrier. In some sense\, the $E \\times B$ stair
 case 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 r
 each a stationary state. Which process will be chosen may depend on an ins
 tant status of environment.
LOCATION:Seminar Room 1\, Newton Institute
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