Geodesic acoustic modes in noncircular cross section tokamaks

Journal Article · Wed Mar 15 04:00:00 EDT 2017 · Plasma Physics Reports

DOI:https://doi.org/10.1134/S1063780X17030126· OSTI ID:22614018

Lakhin, V. P. ^[1]; Konovaltseva, L. V. ^[2]; Ilgisonis, V. I. ^[1]

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1. National Research Center “Kurchatov Institute,” (Russian Federation)
2. People’s Friendship University of Russia (Russian Federation)

The influence of the shape of the plasma cross section on the continuous spectrum of geodesic acoustic modes (GAMs) in a tokamak is analyzed in the framework of the MHD model. An expression for the frequency of a local GAM for a model noncircular cross section plasma equilibrium is derived. Amendments to the oscillation frequency due to the plasma elongation and triangularity and finite tokamak aspect ratio are calculated. It is shown that the main factor affecting the GAM spectrum is the plasma elongation, resulting in a significant decrease in the mode frequency.

• OSTI ID: 22614018
• Journal Information: Plasma Physics Reports, Journal Name: Plasma Physics Reports Journal Issue: 3 Vol. 43; ISSN PPHREM; ISSN 1063-780X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ASPECT RATIO
CROSS SECTIONS
ELONGATION
GEODESICS
MAGNETOHYDRODYNAMICS
OSCILLATIONS
PLASMA
SHAPE
SOUND WAVES
SPECTRA
TOKAMAK DEVICES