CRPP-EPFL, Av.des Bains 21, CH-1007 Lausanne
An analysis has been carried out with the full wave code PENN for the GAE mode observed in the TCA tokamak. Both, the fluid and the kinetic models predict frequencies and dampings which are in good agreement with the experiment. Using the fluid model, the GAE mode is located in the plasma core and damped via resonance absorption in the plasma exterior. With the kinetic description, two mode conversion mechanisms lead to Landau damping of a kinetic Alfven wave: one is the counterpart of the fluid models' resonance absorption and occurs in the external parts of the plasma; the other has no such fluid correspondance, and is induced non perturbatively in the plasma core through toroidal coupling between the global GAE wavefield and the kinetic Alfven wave.
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