Collisional damping of the geodesic acoustic mode with toroidal rotation. I. Viscous damping

With the dispersion relation derived for the geodesic acoustic mode in toroidally rotating tokamak plasmas using the fluid model, the effect of the toroidal rotation on the collisional viscous damping of the geodesic acoustic mode is investigated. It is found that the collisional viscous damping of the geodesic acoustic mode has weak increase with respect to the toroidal Mach number. (C) 2016 AIP Publishing LLC.