Gyrokinetic-magnetohydrodynamic hybrid simulation of the transition from toroidal Alfv{acute e}n eigenmodes to kinetic ballooning modes in tokamaks
- Department of Physics and Astronomy, University of California, Irvine, California 92717 (United States)
A gyrokinetic-magnetohydrodynamic (MHD) hybrid simulation code has been developed in order to study high-{ital n} (where {ital n} is the toroidal mode number) MHD instabilities driven by energetic particles in finite-{beta} tokamaks. Here {beta} is the ratio between plasma and magnetic pressures. Specifically, it is observed that as the core plasma {beta} value increases, there is a corresponding transition from the toroidal Alfv{acute e}n eigenmode (TAE) to the kinetic ballooning mode (KBM). The energetic particle mode (EPM) branches of both the toroidal Alfv{acute e}n mode (TAM) and KBM are shown to be important in this transition. KBM are preferentially excited when the energetic particle velocity is small compared to the Alfv{acute e}n velocity. {copyright} {ital 1996 American Institute of Physics.}
- DOE Contract Number:
- FG03-94ER54271
- OSTI ID:
- 284298
- Journal Information:
- Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 6 Vol. 3; ISSN PHPAEN; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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