Geodesic acoustic mode frequencies in experimental tokamak equilibria

被引：8

作者：

Hager, R. ^{[1
]}

Hallatschek, K. ^{[1
]}

机构：

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

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2013年 / 55卷 / 03期

关键词：

ZONAL FLOWS; TURBULENCE; RANGE; OSCILLATIONS; TRANSITION; TRANSPORT; SYSTEMS; PLASMAS; REGIME; EDGE;

D O I：

10.1088/0741-3335/55/3/035009

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：

The geodesic acoustic mode (GAM) frequency is calculated for experimental equilibrium data from ASDEX Upgrade and NSTX discharges using an eigenvalue solver. For this purpose, a special algorithm is applied to generate precise, smooth flux-surfaces suitable for calculation of local equilibria from the coarse grained output of the equilibrium solver CLISTE. Since realistic magnetic geometries allow for more than one mode with the properties of a GAM, two-fluid turbulence computations are discussed to clarify the influence of the turbulence on the linear mode spectrum. Using equilibrium data from ASDEX Upgrade this approach is shown to be superior to the use of approximated flux-surface shapes and leads to better agreement with the experimental results.

引用

页数：7

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