A branch of energetic-particle driven geodesic acoustic modes due to magnetic drift resonance

被引：23

作者：

Sasaki, M. ^{[1
,2
]}

Kasuya, N. ^{[1
,2
]}

Itoh, K. ^{[2
,3
]}

Hallatschek, K. ^{[2
,4
]}

Lesur, M. ^{[5
]}

Kosuga, Y. ^{[2
,6
]}

Itoh, S. -I. ^{[1
,2
]}

机构：

[1] Kyushu Univ, Appl Mech Res Inst, Kasuga, Fukuoka 8168580, Japan

[2] Kyushu Univ, Res Ctr Plasma Turbulence, Kasuga, Fukuoka 8168580, Japan

[3] Natl Inst Fus Sci, Toki, Gifu 5095292, Japan

[4] Max Planck Inst Plasma Phys, Boltzmannstr, D-85748 Garching, Germany

[5] Lorraine Univ, Inst Jean Lamour, F-54506 Nancy, France

[6] Kyushu Univ, Inst Adv Study, Fukuoka 8128581, Japan

来源：

PHYSICS OF PLASMAS | 2016年 / 23卷 / 10期

关键词：

ZONAL FLOWS; EXPLANATION;

D O I：

10.1063/1.4963397

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：

Eigenmode analysis of geodesic acoustic modes (GAMs) driven by fast ions is performed, based on a set of gyrokinetic equations. Resonance to the magnetic drift of the fast ions can destabilize GAMs. A new branch is found in the family of GAMs, whose frequency is close to the magnetic drift frequency of the fast ions. The poloidal eigenfunction of this branch has bump structures in the poloidal direction where the resonance of the magnetic drift with the mode is strong. The ion heating rate by the GAMs is evaluated in the framework of quasi-linear theory. The heating is localized poloidally around the resonance locations. Owing to the bumps in the eigenfunction, the magnitude of the heating is much larger than that estimated without the magnetic drift resonance. Published by AIP Publishing.

引用

页数：7

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