Alfvén waves can be driven unstable and reach amplitudes at which they cause radial trans-port of fast particles. In a tokamak, the coupling of different poloidal harmonics of the Alfvén wave spectrum produces global wave fields known as Alfvén Eigenmodes (AEs), of which two are discussed here: Toroidal Alfvén Eigenmodes (TAEs) and Elliptical Alfvén Eigenmodes (EAEs). Knowing the mechanisms for the damping of the AEs can help con-trol the impact they have on the radial transport of the fast particles. In the absence of direct charge exchange measurements and if TAEs and EAEs are driven unstable, their measured frequencies can yield an estimate of the bulk plasma rotation.