Geodesic Acoustic Mode Induced by Toroidal Rotation in Tokamaks

Journal Article · Fri Sep 12 04:00:00 EDT 2008 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.101.115003· OSTI ID:21179708

Wahlberg, C ^[1]

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1. Department of Physics and Astronomy, EURATOM/VR Fusion Association, P.O. Box 516, Uppsala University, SE-751 20 Uppsala (Sweden)

The effect of toroidal rotation on the geodesic acoustic mode (GAM) in a tokamak is studied. It is shown that, in addition to a small frequency upshift of the ordinary GAM, another GAM, with much lower frequency, is induced by the rotation. The new GAM appears as a consequence of the nonuniform plasma density and pressure created by the centrifugal force on the magnetic surfaces. Both GAMs in a rotating plasma are shown to exist both as continuum modes with finite mode numbers m and n at the rational surfaces q=m/n as well as in the form of axisymmetric modes with m=n=0.

• OSTI ID: 21179708
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 11 Vol. 101; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
AXIAL SYMMETRY
MODE RATIONAL SURFACES
PLASMA DENSITY
ROTATING PLASMA
ROTATION
TOKAMAK DEVICES