High Frequency Geodesic Acoustic Modes in Electron Scale Turbulence
Paper i proceeding, 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

Författare

Johan Anderson

Chalmers, Rymd- och geovetenskap, Transportteori

Hans Nordman

Chalmers, Rymd- och geovetenskap, Transportteori

Andreas Skyman

Chalmers, Rymd- och geovetenskap, Transportteori

Raghvendra Singh

P.K. Kaw

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

Styrkeområden

Energi

Fundament

Grundläggande vetenskaper

Ämneskategorier

Fusion, plasma och rymdfysik