Properties of geodesic acoustic modes and the relation to density fluctuations

Properties of geodesic acoustic modes and the relation to density fluctuations

The geodesic acoustic mode (GAM) is a high frequency branch of zonal flows, which is observed in toroidal plasmas. Because of toroidal curvature effects, density fluctuations are excited, which are investigated with the O-mode correlation reflectometer at TEXTOR. This Letter reports on the poloidal...

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Veröffentlicht in:Physical review letters 2006-07, Vol.97 (4), p.045006-045006, Article 045006
Hauptverfasser: Krämer-Flecken, A, Soldatov, S, Koslowski, H R, Zimmermann, O
Format: Artikel
Sprache:eng
Schlagworte:
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CORRELATIONS
DENSITY
DISTRIBUTION
FLUCTUATIONS
PLASMA
TEXTOR TOKAMAK
TURBULENCE
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Zusammenfassung:The geodesic acoustic mode (GAM) is a high frequency branch of zonal flows, which is observed in toroidal plasmas. Because of toroidal curvature effects, density fluctuations are excited, which are investigated with the O-mode correlation reflectometer at TEXTOR. This Letter reports on the poloidal distribution of GAM induced density fluctuation and compares them with theoretical predictions. The influence of the GAM flows on the ambient turbulence is studied, too.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.97.045006