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Generalised zonal modes in stationary axisymmetric plasmas
Ecole Polytech Fed Lausanne, SPC, CH-1015 Lausanne, Switzerland..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Space Plasma Physics.
2017 (English)In: Plasma Physics and Controlled Fusion, ISSN 0741-3335, E-ISSN 1361-6587, Vol. 59, no 5, 054011Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2017. Vol. 59, no 5, 054011
Keyword [en]
zonal, GAMs, MHD, toroidal rotation, kinetic-MHD
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:uu:diva-321795DOI: 10.1088/1361-6587/aa6633ISI: 000399224400001OAI: oai:DiVA.org:uu-321795DiVA: diva2:1094778
Available from: 2017-05-11 Created: 2017-05-11 Last updated: 2017-05-11Bibliographically approved

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Wahlberg, Christer

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