CRPP, EPFL, CH-1015 Lausanne, Switzerland
*)Alfvén Laboratory, Teknikringen 31, KTH, SE-100 44 Stockholm, Sweden
The absorption of power is studied with fluid and gyrokinetic plasma models, when Alfvén or ion-ion hybrid resonances provide for a weak damping in a partially standing wavefield. Examples chosen in slab and toroidal geometry show that the fluid predictions based on resonance absorption are generally very different from the Landau damping of mode-converted slow waves. They in particular suggest that the continuum damping of toroidal Alfvén eigenmodes (TAE) and the power deposition profiles obtained in the ion-cyclotron range of frequencies (ICRF) using fluid plasma models are very misleading.
PACS numbers: 52.35.Bj, 52.35.Py, 52.50.Gj, 52.65.Tt
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