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Title: Persistence of Ion Temperature Gradient Turbulent Transport at Finite Normalized Pressure
Authors: Ishizawa, A.
Urano, D.
Nakamura, Y.
Maeyama, S.
Watanabe, T.-H.
Author's alias: 石澤, 明宏
中村, 祐司
Issue Date: 10-Jul-2019
Publisher: American Physical Society (APS)
Journal title: Physical Review Letters
Volume: 123
Thesis number: 025003
Abstract: Plasma β dependence of electromagnetic turbulent transport is investigated by means of gyrokinetic simulations with self-consistent change of the equilibrium magnetic field. It is found that energy transport due to ion-temperature-gradient (ITG) driven turbulence does not decrease with increasing β; that is, the ion energy diffusivity does not decrease, and the electron energy diffusivity increases with β. This is because magnetic fluctuations are significantly influenced by the background magnetic field structure change with β by the Pfirsch-Schluter current. The magnetic field change weakens the suppression effect of magnetic perturbations on the growth of the ITG mode, and it also suppresses nonlinear zonal flow production. The influence of the magnetic field change is significant as the global magnetic shear increases.
Rights: © 2019 American Physical Society
DOI(Published Version): 10.1103/PhysRevLett.123.025003
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