Parametric Excitation of Geodesic Acoustic Modes by Electron Drift Waves and Ion Temperature Gradient Modes in Tokamak Plasmas

Journal Article · Sat Nov 01 00:00:00 EDT 2008 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3033733· OSTI ID:21251766

Guzdar, P N; Kleva, R G ^[1]; Chakrabarti, N ^[2]; Kaw, P K; Singh, R ^[3]; Naulin, V; Rasmussen, J J ^[4]

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1. IREAP, University of Maryland, College Park, MD 20742 (United States)
2. SINP, Kolkata (India)
3. IPR, Gandhinagar, 308423 (India)
4. EURATOM, Roskilde (Denmark)

Geodesic Acoustic Modes (GAMs) have been predicted and subsequently observed in many toroidal plasma devices. Bicoherence studies on various devices have suggested three-wave mode coupling processes between GAMs and high frequency turbulence. Thus the parametric coupling of GAMS to drift waves and/or ion temperature gradient(ITG{r_brace} modes is a potential candidate for excitation of these modes. In this paper we discuss the resonant three-wave coupling mechanism for the excitation of GAMs by ITG and finite beta drift waves in homogeneous and inhomogeneous plasmas and compare theoretical predictions with observed characteristics of the GAMs.

• OSTI ID: 21251766
• Journal Information: AIP Conference Proceedings, Vol. 1069, Issue 1; Conference: Joint Varenna-Lausanne international workshop on theory of fusion plasmas, Varenna (Italy), 25-29 Aug 2008; Other Information: DOI: 10.1063/1.3033733; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACOUSTICS
ELECTRON DRIFT
INHOMOGENEOUS PLASMA
ION TEMPERATURE
NONLINEAR PROBLEMS
PLASMA DRIFT
TEMPERATURE GRADIENTS
TOKAMAK DEVICES
TURBULENCE
WAVE PROPAGATION