Session KP01 - Poster Session III.
POSTER session, Tuesday afternoon, March 23
Exhibit Hall, GWCC
To investigate the influence of fast particles on the stability of MHD equilibria kinetic effects have to be considered. Since it has been shown recently that the variational CAS3D code sucessfully describes Alfvén waves in three-dimensional equilibria this code will be extendend to include kinetic effects.
A drift kinetic equation is linearized and solved in three-dimensional geometry with a full electromagnetic perturbation. From this a generalized energy principle is derived. The time scale is drift-kinetic so that the resulting kinetic term contains resonances with bounce, transit and bounce-averaged drift frequencies of the hot particle population.
The energy principle is quadratic with respect to the perturbation and the force operator is not self adjoint and depends on ømega. This destabilizes otherwise stable MHD modes. Initially, growth rates and frequency shifts are estimated via a perturbative solution of the eigenvalue problem.