Short wavelength ion temperature gradient instability in toroidal plasmas

Journal Article · Tue Feb 01 00:00:00 EST 2005 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.1840687· OSTI ID:20698338

Zhe, Gao; Sanuki, H; Itoh, K; Dong, J Q ^[1]

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1. Department of Engineering Physics, Tsinghua University, Beijing 100084 (China)

Series of ion temperature gradient (ITG or {eta}{sub i}) driven modes in the short wavelength region, vertical bar k{sub perpendicular}{rho}{sub i} vertical bar>1, are investigated with a gyrokinetic integral equation code in toroidal plasmas. These instabilities exist even if electrons are assumed adiabatic. However, nonadiabatic electron response can influence these short wavelength ITG (SWITG) modes, especially the fundamental l=0 mode. At typical parameters, excitation of the l=0 mode requires that both {eta}{sub i} and {eta}{sub e} exceed thresholds, while the l=1 and l=2 modes with higher harmonic eigenfunctions persist unstable even at {eta}{sub e}=0. Dependence of the SWITG modes on other parameters is also investigated. The l=1 mode with an odd potential eigenfunction grows faster than the l=0 mode and may be dominant in low {eta}{sub e}, high {beta}, weak positive magnetic shear, and/or weak toroidicity regions.

• OSTI ID: 20698338
• Journal Information: Physics of Plasmas, Vol. 12, Issue 2; Other Information: DOI: 10.1063/1.1840687; (c) 2005 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
EIGENFUNCTIONS
EIGENVALUES
ELECTRON TEMPERATURE
INTEGRAL EQUATIONS
ION TEMPERATURE
PLASMA CONFINEMENT
PLASMA INSTABILITY
TEMPERATURE GRADIENTS