Stability of Alfvén eigenmodes in optimized tokamaks
Alfvén eigenmodes (AEs) with intermediate toroidal mode numbers are modelled using the global gyrokinetic PENN code to determine the stability of high performance tokamak discharges in the presence of energetic particles. A large plasma pressure and a weak magnetic shear in the core give rise to radially extended kinetic AEs, which are stabilized by the high shear at the edge of a divertor (X point) configuration. Large values for the safety factor and the ion Larmor radius in reversed shear operation may however trigger drift kinetic Alfvén eigenmode instabilities that could affect the alpha particle confinement in a reactor.
Bibliographic Reference: An article published in: Nuclear Fusion 40 (July 2000) 1343-1348
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://stacks.iop.org/0029-5515/40/1343
Record Number: 200316010 / Last updated on: 2003-03-05
Original language: en
Available languages: en