Electron geodesic acoustic modes in electron temperature gradient mode turbulence

Journal Article · Wed Aug 15 00:00:00 EDT 2012 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4742321· OSTI ID:22086015

Anderson, Johan; Nordman, Hans ^[1]; Singh, Raghvendra; Kaw, Predhiman ^[2]

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1. Department of Earth and Space Sciences, Chalmers University of Technology, SE-412 96 Goeteborg (Sweden)
2. Institute for Plasma Research, Bhat, Gandhinagar, Gujarat 382428 (India)

In this work, the first demonstration of an electron branch of the geodesic acoustic mode (el-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 el-GAMs driven nonlinearly by ETG modes is derived. A new saturation mechanism for ETG turbulence through the interaction with el-GAMs is found, resulting in a significantly enhanced ETG turbulence saturation level compared to the mixing length estimate.

• OSTI ID: 22086015
• Journal Information: Physics of Plasmas, Vol. 19, Issue 8; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
DISPERSION RELATIONS
ELECTRON TEMPERATURE
ELECTRONS
GEODESICS
IONS
SATURATION
SOUND WAVES
TEMPERATURE GRADIENTS
TURBULENCE