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research article

Generalised zonal modes in stationary axisymmetric plasmas

Graves, J P
•
Wahlberg, C
2017
Plasma Physics and Controlled Fusion

The MHD model enables derivation and analysis of the rich structure of geodesic acoustic modes (GAMs) and zonal modes in axisymmetric magnetic confined plasmas. The modes are identifiable from a single dispersion relation as two branches of slow magnetosonic continua. The lower frequency branch can be identified as a zonal flow (ZF), which in the simplified limit of static plasmas, has vanishing magnetic component. It is shown in this contribution that axisymmetric, and lesser known non-axisymmetric, zonal modes can be derived from MHD and kinetic models. The work provides a comprehensive derivation of the GAMs and ZF continua in stationary toroidally rotating plasmas, and investigates the exact solution and structure of a generalised family of zonal modes in static equilibria.

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Type
research article
DOI
10.1088/1361-6587/aa6633
Web of Science ID

WOS:000399224400001

Author(s)
Graves, J P
Wahlberg, C
Date Issued

2017

Publisher

IoP

Published in
Plasma Physics and Controlled Fusion
Volume

59

Issue

5

Article Number

054011

Subjects

zonal

•

GAMs

•

MHD

•

toroidal rotation

•

kinetic-MHD

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
SPC  
Available on Infoscience
January 11, 2018
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/143727
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