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Global saturation physics of ion temperature gradient turbulence in finite normalized pressure tokamaks

Masui, Hideaki Ishizawa, Akihiro Imadera, Kenji Kishimoto, Yasuaki Nakamura, Yuji 京都大学 DOI:10.1088/1741-4326/ac667f

2022.04

概要

Nonlinear saturation mechanism of ion-temperature-gradient turbulence at finite normalized pressure is identified by analysis of the nonlinear entropy transfer in global gyrokinetic simulations of the turbulence. Turbulence at such finite normalized pressure is electromagnetic and often exhibits non-saturation due to a lack of zonal flows by the influence of magnetic fluctuations of the turbulence in local gyrokinetic simulations. The present study identifies a new saturation mechanism caused by global entropy transfer due to turbulent E × B flow convection in real space. The convection of the entropy associated with the turbulence in the radial direction produces global zonal flows at the both sides of the most active region of the turbulence to avoid the effect of the magnetic fluctuations, and then global zonal-flow excitation is not suppressed, leading to a steady state of the turbulence.

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Acknowledgments

This work was supported by the Japanese Ministry of Education, Culture, Sports, Science and Technology, Grant No.

17K06991. Simulations are performed on Plasma Simulator

supercomputer at NIFS and JFRS-1 supercomputer at QST.

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