Linear and nonlinear dynamics of Alfvén eigenmodes in JET plasmas
The stability of Alfvén eigenmodes in JET is studied using a hybrid gyrokinetic magnetohydrodyanmic (MHD) model which takes into account finite orbit effects, realistic plasma geometry and Alfvén waves fields including first order ion Larmor radius corrections. This analysis provides stability diagrams for global Alfvén eigenmodes in the presence of fusion products or energetic ions generated by auxiliary heating. The nonlinear evolution and saturation of the modes is studied using an Hamiltionian guiding center description of the particle motion in a perturbed magnetic field with a self consistent update of the amplitude and phase of the wave.
Bibliographic Reference: Article: Proceedings of the 23rd European Physical Society Conference on Controlled Fusion and Plasma Physics, Kiev (UA), June 24-28, 1996, pp. 143-146
Record Number: 199710347 / Last updated on: 1997-04-14
Original language: en
Available languages: en