High Frequency Geodesic Acoustic Modes in Electron Temperature Gradient Mode Turbulence

Details High Frequency Geodesic Acoustic Modes in Electron Temperature Gradient Mode Turbulence High Frequency Geodesic Acoustic Modes in Electron Temperature Gradient Mode Turbulence

2012-03-06

arxiv.org/abs/1203.1174v2

Physics

Plasma Physics

14 pages, submitted to Physics of Plasmas

Scientific paper

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.

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