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Geodesic Acoustic Mode: Difference between revisions
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The Geodesic Acoustic Mode (GAM) is a plasma oscillation occurring in toroidal confinement devices with the following properties: | The Geodesic Acoustic Mode (GAM) is a plasma oscillation occurring in toroidal confinement devices with the following properties: | ||
<ref>N. Winsor, J.L. Johnson and J.M. Dawson, ''Geodesic Acoustic Waves in Hydromagnetic Systems'', [[doi:10.1063/1.1691835|Phys. Fluids '''11''' (1968) 2448]]</ref> | <ref>N. Winsor, J.L. Johnson and J.M. Dawson, ''Geodesic Acoustic Waves in Hydromagnetic Systems'', [[doi:10.1063/1.1691835|Phys. Fluids '''11''' (1968) 2448]]</ref> | ||
<ref>K.J. Zhao et al., ''Toroidal Symmetry of the Geodesic Acoustic Mode Zonal Flow in a Tokamak Plasma'', [[doi:10.1103/PhysRevLett.96.255004|Phys. Rev. Lett. '''96''' (2006) 255004]]</ref> | <ref name=Zhao>K.J. Zhao et al., ''Toroidal Symmetry of the Geodesic Acoustic Mode Zonal Flow in a Tokamak Plasma'', [[doi:10.1103/PhysRevLett.96.255004|Phys. Rev. Lett. '''96''' (2006) 255004]]</ref> | ||
<ref>Z. Gao, ''Collisional damping of the geodesic acoustic mode'', [[doi:10.1063/1.4794339|Phys. Plasmas '''20''' (2013) 032501]]</ref> | |||
* Radially localized | * Radially localized | ||
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* Poloidally symmetric potential (m=0) and asymmetric density (m=1) perturbations | * Poloidally symmetric potential (m=0) and asymmetric density (m=1) perturbations | ||
The GAM frequency is, approximately: | The GAM frequency is, approximately:<ref name=Zhao></ref> | ||
:<math>f_{GAM} \sim (1+1/2q^2)\frac{\sqrt{(T_e+T_i)/M_i}}{2\pi R}</math> | :<math>f_{GAM} \sim (1+1/2q^2)\frac{\sqrt{(T_e+T_i)/M_i}}{2\pi R}</math> | ||