Persistence of Ion Temperature Gradient Turbulent Transport at Finite Normalized Pressure

被引：20

作者：

Ishizawa, A. ^{[1
]}

Urano, D. ^{[1
]}

Nakamura, Y. ^{[1
]}

Maeyama, S. ^{[2
]}

Watanabe, T-H ^{[2
]}

机构：

[1] Kyoto Univ, Grad Sch Energy Sci, Uji, Kyoto 6110011, Japan

[2] Nagoya Univ, Dept Phys, Nagoya, Aichi 4648602, Japan

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 123卷 / 02期

关键词：

BETA; CONFINEMENT; MODE;

D O I：

10.1103/PhysRevLett.123.025003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Plasma beta 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 beta; that is, the ion energy diffusivity does not decrease, and the electron energy diffusivity increases with beta. This is because magnetic fluctuations are significantly influenced by the background magnetic field structure change with beta 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.

引用

页数：6

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