Electromagnetic and kinetic effects on the ion temperature gradient mode
- 1 January 1992
- journal article
- letter
- Published by IOP Publishing in Nuclear Fusion
- Vol. 32 (1) , 151-155
- https://doi.org/10.1088/0029-5515/32/1/i13
Abstract
Effects of finite beta , ion kinetic damping and trapped electrons on the toroidal ion temperature gradient (ITG) mode have been investigated by two methods-a fully toroidal fluid analysis corrected for ion Landau damping, and an electromagnetic local kinetic dispersion relation. When trapped electrons are ignored, the ITG mode is stabilized at a beta value well below the critical beta for the ideal MHD ballooning mode (βMHD). Trapped electrons are destabilizing and increase the upper limit of beta to a level comparable with βMHD. Ion Landau damping increases the critical temperature gradient typically by a factor of two (LT/LB 0.18), and the growth rate remains smaller than the ion transit frequency, ωTi = k||vTiKeywords
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