Turbulence and anomalous tokamak transport control by Geodesic Acoustic Mode
1 Ioffe Institute - Politekhnicheskaya 26, 194021 St. Petersburg, Russia
2 Aalto University - Espoo, Finland
Received: 3 February 2015
Accepted: 3 June 2015
The elementary process of turbulence control by Geodesic Acoustic Modes (GAMs) leading to modulation of its level at the GAM frequency is for the first time supported by experimental observations at the FT-2 tokamak. The modulation effect is confirmed by the global total-distribution-function gyrokinetic modelling of the tokamak discharge, predicting strong modulation of the electron thermal diffusivity induced by GAMs, which propagates inward and possesses the GAM temporal and spatial structure.
PACS: 52.35.Ra – Plasma turbulence / 52.25.Fi – Transport properties / 52.65.Tt – Gyrofluid and gyrokinetic simulations
© EPLA, 2015