On the Effects of Tokamak Plasma Edge Symmetries on Turbulence Relaxation

被引：3

作者：

Carlevaro, Nakia ^{[1
]}

Montani, Giovanni ^{[1
,2
]}

Moretti, Fabio ^{[1
]}

机构：

[1] ENEA, Fus & Nucl Safety Dept, CR Frascati, Via E Fermi 45, I-00044 Frascati, Italy

[2] Sapienza Univ Rome, Phys Dept, Ple Aldo Moro 5, I-00185 Rome, Italy

来源：

SYMMETRY-BASEL | 2023年 / 15卷 / 09期

关键词：

nonlinear fluid dynamics; axisymmetric modes; plasma turbulence; tokamak edge physics;

D O I：

10.3390/sym15091745

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The plasma edge of a tokamak configuration is characterized by turbulent dynamics leading to enhanced transport. We construct a simplified 3D Hasegawa-Wakatani model reducing to a single partial differential equation for the turbulent electric potential dynamics. Simulations demonstrate how the 3D turbulence relaxes on a 2D axisymmetric profile, corresponding to the so-called interchange turbulence. The spectral features of this regime are found to be strongly dependent on the initialization pattern. We outline that the emergence of axisymmetric turbulence is also achieved when the corresponding mode amplitude is not initialized. Then, we introduce the symmetries of the magnetic X-point of a tokamak configuration. We linearize the governing equation by treating the poloidal field as a small correction. We show that it is not always possible to solve the electric potential dynamics following a perturbative approach. This finding, which is due to resonance between the modes of the background and the poloidal perturbation, confirms that the X-point symmetries can alter the properties of turbulent transport in the edge region.

引用

页数：17

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