High Frequency Geodesic Acoustic Modes in Electron Scale Turbulence
Paper in proceedings, 2012

In this work the first demonstration of a high frequency branch of the geodesic acoustic mode (GAM) driven by electron temperature gradient (ETG) modes is presented. The work is based on a fluid description of the ETG mode retaining non-adiabatic ions and the dispersion relation for high frequency GAMs driven nonlinearly by ETG modes is derived. A new saturation mechanism for ETG turbulence through the interaction with high frequency GAMs is found, resulting in a significantly enhanced ETG turbulence saturation level compared to the mixing length estimate.

ETG

Turbulence

GAMs

Author

Johan Anderson

Chalmers, Earth and Space Sciences, Transport Theory

Hans Nordman

Chalmers, Earth and Space Sciences, Transport Theory

Andreas Skyman

Chalmers, Earth and Space Sciences, Transport Theory

Raghvendra Singh

P.K. Kaw

Proceedings 24th IAEA FEC, San Diego 8-13 October 2012

Areas of Advance

Energy

Roots

Basic sciences

Subject Categories

Fusion, Plasma and Space Physics

More information

Created

10/8/2017