Secondary instability of electromagnetic ion-temperature-gradient modes for zonal flow generation
- Department of Nuclear Engineering, Chalmers University of Technology, SE-412 96 Goeteborg (Sweden)
- Department of Earth and Space Sciences, Chalmers University of Technology, SE-412 96 Goeteborg (Sweden)
- Institute for Plasma Research, Bhat, Gandhinagar, Gujarat 382428 (India)
An analytical model for zonal flow generation by toroidal ion-temperature-gradient (ITG) modes, including finite {beta} electromagnetic effects, is derived. The derivation is based on a fluid model for ions and electrons and takes into account both linear and nonlinear {beta} effects. The influence of finite plasma {beta} on the zonal flow growth rate ({gamma}{sub ZF}) scaling is investigated for typical tokamak plasma parameters. The results show the importance of the zonal flows close to marginal stability where {gamma}{sub ZF}/{gamma}{sub ITG} >> 1 is obtained. In this region the parameter {gamma}{sub ZF}/{gamma}{sub ITG} increases with {beta}, indicating that the ITG turbulence and associated transport would decrease with {beta} at a faster rate than expected from a purely linear or quasi-linear analysis.
- OSTI ID:
- 22046879
- Journal Information:
- Physics of Plasmas, Vol. 18, Issue 7; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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