Geodesic Acoustic Mode

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The Geodesic Acoustic Mode (GAM) is a plasma oscillation occurring in toroidal confinement devices with the following properties: ^[1] ^[2] ^[3]

Radially localized
Axisymmetric (n=0)
Poloidally symmetric potential (m=0) and asymmetric density (m=1) perturbations

The GAM frequency is, approximately:^[2]

f_{GAM}\sim (1+1/2q^{2}){\frac {\sqrt {(T_{e}+T_{i})/M_{i}}}{2\pi R}}

References

↑ N. Winsor, J.L. Johnson and J.M. Dawson, Geodesic Acoustic Waves in Hydromagnetic Systems, Phys. Fluids 11 (1968) 2448
↑ ^2.0 ^2.1 K.J. Zhao et al., Toroidal Symmetry of the Geodesic Acoustic Mode Zonal Flow in a Tokamak Plasma, Phys. Rev. Lett. 96 (2006) 255004
↑ Z. Gao, Collisional damping of the geodesic acoustic mode, Phys. Plasmas 20 (2013) 032501

[1] N. Winsor, J.L. Johnson and J.M. Dawson, Geodesic Acoustic Waves in Hydromagnetic Systems, Phys. Fluids 11 (1968) 2448

[Zhao-2] 2.0 ^2.1 K.J. Zhao et al., Toroidal Symmetry of the Geodesic Acoustic Mode Zonal Flow in a Tokamak Plasma, Phys. Rev. Lett. 96 (2006) 255004

[3] Z. Gao, Collisional damping of the geodesic acoustic mode, Phys. Plasmas 20 (2013) 032501

[1]

[2]

[3]

Geodesic Acoustic Mode

References

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