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Kim Y. J.,Imadera K.,Kishimoto Y.,Hahm T. S. 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.81 No.7
Nonlocal bursty heat transport can be pervasive in fusion plasmas, often leading to deviation from the gyro-Bohm scaling. Recently, radially quasi-periodic structures of E × B shear layers called the E × B staircase have been identifed in fuxdriven gyrokinetic simulations, and their basic properties have been recognized. In this study, we investigate heat transport events and the E × B staircase from the GyroKinetic-based Numerical Experiment of Tokamak (GKNET) [Imadera et al., IAEA-FEC, TH/P5-8 (2014)] fux-driven gyrokinetic simulation of ion temperature gradient (ITG) turbulence. We classify the nonlocal heat transport events according to characteristics of their interaction with the E × B staircase, as bursts and avalanches. Statistical properties of bursts and avalanches are analyzed and the relations to the existing E × B staircase models are elucidated.