On electromagnetic perturbations of geodesic acoustic modes in anisotropic tokamak plasmas

被引：0

作者：

Chen, Zhe ^{[1
,2
]}

Ren, Haijun ^{[1
,2
,3
]}

Wang, Hao ^{[4
]}

Roach, Colin ^{[3
]}

机构：

[1] Univ Sci & Technol China, CAS, Key Lab Geospace Environm, Hefei 230026, Anhui, Peoples R China

[2] Univ Sci & Technol China, Sch Phys Sci, Dept Engn & Appl Phys, Hefei 230026, Anhui, Peoples R China

[3] Culham Ctr Fus Energy, Abingdon OX14 3DB, England

[4] Natl Inst Fus Sci, Toki 5095292, Japan

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2025年 / 67卷 / 04期

基金：

中国国家自然科学基金;

关键词：

geodesic acoustic mode; electromagnetic perturbation; anisotropy; equilibrium condition; INSTABILITIES; EXPLANATION; TURBULENCE; TRANSPORT; EQUATIONS;

D O I：

10.1088/1361-6587/adb886

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Electromagnetic geodesic acoustic modes are analytically investigated in tokamak plasmas with anisotropy, utilizing gyro-kinetic equations and a rigorously self-consistent anisotropic distribution. When including first-order finite-orbit-width effects and first-order finite-Larmor-radius effects, it is proven that the anisotropy with an arbitrary strength does not induce the m=+/- 1 harmonics of A & Vert;, where m and A & Vert; denote the poloidal wavenumber and the parallel component of the perturbed magnetic vector potential, respectively. The rigorously self-consistent anisotropy introduces an equilibrium electrostatic field with poloidally asymmetric structure, and consequently induces an additional E -> xB -> drift term within the gyro-kinetic equation. This equilibrium electrostatic field inhibits the anisotropy from generating non-zero m=+/- 1 harmonics of A & Vert;. Indeed we demonstrate that introducing anisotropy self-consistently into the equilibrium quantitatively influences m=+/- 1,+/- 2 harmonics of the perturbed electrostatic potential, but only the m=+/- 2 harmonics of A & Vert;.

引用

页数：9

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